C语言程序设计 翁恺 中M2020春C入门练习第I段——变量、表达式、分支、循环 （2021/09/25 更新：AC代码 翻新至78题）

第一段：变量、表达式、分支、循环

1. 重要的话说三遍

#include 
int main(){
     
	int i;
	for(i=0;i<3;++i)
	{
     
		printf("I'm gonna WIN!\n");
	}
	return 0;
}

2. I Love GPLT

#include 
int main(){
     
	printf("I\n \nL\no\nv\ne\n \nG\nP\nL\nT\n");
	return 0;
}

3. 输出带框文字

#include 
int main(){
     
	printf("************\n  Welcome\n************");
	return 0;
}

4. 输出菱形图案

#include 
int main(){
     
	printf("  A\nA   A\n  A\n");
	return 0;
}

5. 输出倒三角图案

#include 
int main(){
     
	printf("* * * *\n * * *\n  * *\n   *\n");
	return 0;
}

6. 厘米换算英尺英寸

#include 
int main(){
     
	int cm,foot,inch;
	scanf("%d",&cm);
	inch=(int)(cm*1.0/30.48*12)%12;
	foot=(int)(cm*1.0/30.48*12)/12;
	printf("%d %d",foot,inch);
	return 0;
}

7. 计算摄氏温度

#include 
int main(){
     
	int F,C;
	scanf("%d",&F);
	printf("Celsius = %d",5*(F-32)/9);
	return 0;
}

8. 是不是太胖了

#include 
int main(){
     
	int H;
	scanf("%d",&H);
	double weight;
	weight = (H-100)*0.9*2;
	printf("%.1f",weight);     
	return 0;
}

9. 求整数均值

#include 
int main(){
     
	int i,num=0,sum=0;
	for(i=0;i<4;++i)
	{
     
		scanf("%d",&num);
		sum+=num;
	}
	printf("Sum = %d; Average = %.1f",sum,sum*1.0/4.0);     
	return 0;
}

10. 算术入门之加减乘除

#include
int main(){
     
	int a,b;
	double c;
	scanf("%d %d",&a,&b);
	c=1.0*a/b;
	if(a%b==0) printf("%d + %d = %d\n%d - %d = %d\n%d * %d = %d\n%d / %d = %d\n",a,b,a+b,a,b,a-b,a,b,a*b,a,b,(int)c);
	else printf("%d + %d = %d\n%d - %d = %d\n%d * %d = %d\n%d / %d = %.2f\n",a,b,a+b,a,b,a-b,a,b,a*b,a,b,c);
	return 0;
} 

11. 计算平均分

#include
int main(){
     
	int math=87,eng=72,comp=93;
    double average=0;
	average=(math+eng+comp)*1.0/3;
	printf("math = 87, eng = 72, comp = 93, average = %.0lf\n",average);
	return 0;
} 

12. 日期格式化

#include
int main(){
     
	int y,m,d;
	scanf("%d-%d-%d",&m,&d,&y);
	printf("%d-%02d-%02d",y,m,d);
	return 0;
} 

13. 后天

#include
int main(){
     
	int day,result;
	scanf("%d",&day);
	if(day>=1&&day<=5)result=day+2;
	else result=(day+2)%7;
	printf("%d",result);
	return 0;
} 

14. 然后是几点

#include
int main(){
     
	int t1,perid,h1,m1,h2,m2,temp;
	scanf("%d %d",&t1,&perid);
	h1=t1/100;
	m1=t1%100;
	temp=h1*60+m1;
	temp+=perid;
	h2=temp/60;
	m2=temp%60;
	printf("%d%02d",h2,m2);//注意这里分钟保证为输出两字符用%02d表示
	return 0;
} 

15. BCD解密

#include
int main(){
     
	int x,a,b;
	scanf("%d",&x);
	a=x/16;
	b=x%16;
	if(b>=10&&b<16)
	{
     
		a+=1;
		b-=10;
	}
	printf("%d",a*10+b);
	return 0;
} 

16. 计算符号函数的值

#include
int main(){
     
	int n,sign;
	scanf("%d",&n);
	if(n<0)
		sign=-1;
	else if(n==0)
		sign=0; 
	else sign=1;
	printf("sign(%d) = %d",n,sign);
	return 0;
} 

17. 成绩转换

#include
int main(){
     
	int scores;
	char res;
	scanf("%d",&scores);
	if(scores>=90)res='A';
	else if(scores>=80)res='B';
	else if(scores>=70)res='C';
	else if(scores>=60)res='D';
	else res='E';
	printf("%c",res);
	return 0;
} 

18. 出租车计价

#include 

int main()
{
     
	double p, sum = 0;
	int t;
	scanf("%lf %d", &p, &t);
	if (p <= 3)
		sum += 10;
	else if (p <= 10)
		sum = 10 + (p - 3) * 2;
	else
		sum = 24 + (p - 10) * 3;
	sum += (t / 5) * 2;
	printf("%.0lf", sum);
	return 0;
}

19. 计算天数

#include 
int main()
{
     
	int a[12]={
     31,28,31,30,31,30,31,31,30,31,30,31};
	int y,m,d,sum=0,i;
	scanf("%d/%d/%d",&y,&m,&d);
	for(i=0;i<m-1;++i)
		sum+=a[i];
	sum+=d;

	if((y%4==0&&y%100!=0||y%400==0)&&m>2)
		sum+=1;
	printf("%d",sum);
	return 0;
}

20. 简单计算器

这是我的解法，相对复杂，推荐我解法后面的解法

#include 
int main()
{
     
	char ch[100];
    scanf("%s",ch);
    int i=0,res=0,flag=-1,sum,num1,num2,fh;
//num1与num2为操作数，sum为每个整数（用于计算超过两位数的数据）,flag=-1则需要计算num1，flag=0则考虑符合，flag=1则计算num2
    while(ch[i]!='=')
    {
     
        if(flag&&ch[i]>='0'&&ch[i]<='9')
        {
     
            sum=0;
            while(ch[i]>='0'&&ch[i]<='9')
            {
     
                sum*=10;
                sum+=ch[i]-'0';
                ++i;
            }
            if(flag==-1)
                num1=sum;
            else if(flag==1)
            {
     
                num2=sum;
                switch (fh)
                {
     
                case 1:
                    num1=num1+num2;
                    break;
                case 2:
                    num1=num1-num2;
                    break;
                case 3:
                    num1=num1*num2;
                    break;
                case 4:
                    if(num2)
                        num1=num1/num2;
                    else
                        flag=-100;
                    break;
                }
            }
            if(flag==-100)
                break;
            flag=0;
        }
        if(flag==0&&ch[i]!='=')
        {
     
            switch (ch[i])
            {
     
            case '+':
                fh=1;
                break;
            case '-':
                fh=2;
                break;
            case '*':
                fh=3;
                break;
            case '/':
                fh=4;
                break;
            default :
                flag=-100;
            }
            if(flag==-100)
            {
     
                break;
            }
            ++i;
            flag=1;
        }
    }
    if(flag!=-100)
        printf("%d",num1);
    else
    {
     
        printf("ERROR");
    }
    
	return 0;
}

简单计算器 https://zhuanlan.zhihu.com/p/116734673

#include 
int main()
{
     
	int sum,a;
	char c;
	scanf("%d",&sum);
	while(scanf("%c",&c))
	{
     
		switch(c)
		{
     
			case '+':scanf("%d",&a);sum+=a;break;
			case '-':scanf("%d",&a);sum-=a;break;
			case '*':scanf("%d",&a);sum*=a;break;
			case '/':scanf("%d",&a);
				if(a==0)
				{
     
					printf("error");
					return 0;
				}else{
     
					sum/=a;break;	
				}
			case '=':printf("%d",sum);return 0;
			default :printf("error");return 0;
		}
	}
	return 0;
}

21. 超速判断

#include 
int main()
{
     
	int v;
	scanf("%d",&v);
	if(v<=60)printf("Speed: %d - OK",v);
	else printf("Speed: %d - Speeding",v);
	return 0;
}

22. 用天平找小球

#include 
int main()
{
     
	int a,b,c;
	scanf("%d %d %d",&a,&b,&c);
	if(a==b)printf("C");
	else if(a==c)printf("B");
	else printf("A");
	return 0;
}

23. 分段计算居民水费

#include 
int main()
{
     
	int x;double y;
	scanf("%d",&x);
	if(x<=15)y=4.0*x/3;
	else y=2.5*x-17.5;
	printf("%.2lf",y);
	return 0;
}

24. 猜数字游戏

#include

int main()
{
     
    int sc,n,num,cnt=0;
    scanf("%d %d",&sc,&n);
    while(scanf("%d",&num),num>=0)
    {
     
        ++cnt;
        if(cnt>n)
            break;
        if(sc==num)
            break;
        else if(num>sc)
            printf("Too big\n");
        else if(num<sc)
            printf("Too small\n");
    }
    if(cnt<=n&&sc==num)
    {
     
        if(cnt==1)
            printf("Bingo!\n");
        else if(cnt<=3)
            printf("Lucky You!\n");
        else
            printf("Good Guess!\n");
    }
    else
    {
     
        printf("Game Over\n");
    }
    
    return 0;
}

25. 求奇数和

#include 
int main()
{
     
	int sum=0,a;
	scanf("%d",&a);
	while(a>0)
	{
     
		if(a%2)
			sum+=a;
		scanf("%d",&a);
	}
	printf("%d",sum);
	return 0;
}

26. 最大公约数和最小公倍数

#include 
int main()
{
     
	int a,b,ji;
	scanf("%d %d",&a,&b);
	ji=a*b;
	while(a%b)
	{
     
		int temp;
		temp=b;
		b=a%b;
		a=temp;
	}
	printf("%d %d",b,ji/b);
	return 0;
}

27.兔子繁衍问题

#include

int main()
{
     
    int N,fib[2]={
     1,1},cnt=1;
    scanf("%d",&N);
    while(N>fib[(cnt-1)%2])
    {
     
        fib[(cnt-1)%2]=fib[0]+fib[1];
        ++cnt;
    }
    printf("%d",cnt);
    return 0;
}

28. 求整数的位数及各位数字之和

#include 
int main()
{
     
    int number,sum=0,count=0;
    scanf("%d",&number);
    while(number>0)
    {
     
    	sum+=number%10;
		count++;
    	number/=10;
    	
	}
	printf("%d %d",count,sum);
    return 0;
}

奇技淫巧

#include 
int main()
{
     
    int number,sum=0,count=0;
    while(scanf("%1d",&number)!=EOF)
    {
     
    	sum+=number;
		count++;
	}
	printf("%d %d",count,sum);
    return 0;
}

29. 二分法求多项式单根

#include 

double a3,a2,a1,a0;
double a,b;

double f(double x){
     
	return a3*x*x*x+a2*x*x+a1*x+a0;
}

int main()
{
     
    scanf("%lf %lf %lf %lf",&a3,&a2,&a1,&a0);
    scanf("%lf %lf",&a,&b);
	double temp=(a+b)/2;
    int flag=f(a)>0?1:-1;
    while(b-a>1e-4)
    {
     
        if(f(temp)==0)
            break;
        if(flag*f(temp)>0)
            a=temp;
        else if(flag*f(temp)<0)
            b=temp;
    	temp = (a+b)/2;
	}
	printf("%.2lf",temp);
    return 0;
}

30. 念数字

#include 

int main()
{
     
    char ch;
    int judge=0;
    do
    {
     
    	scanf("%c",&ch);
    	if(judge&&ch!='\n')printf(" ");
    	judge=1;
    	if(ch=='-')
    		printf("fu");
    	else 
    	{
     
    		switch(ch)
    		{
     
    			case '0':printf("ling");break;
    			case '1':printf("yi");break;
    			case '2':printf("er");break;
    			case '3':printf("san");break;
    			case '4':printf("si");break;
    			case '5':printf("wu");break;
    			case '6':printf("liu");break;
    			case '7':printf("qi");break;
    			case '8':printf("ba");break;
    			case '9':printf("jiu");break;
			}
		}
		
	}while(ch!='\n');
    
    return 0;
}

31. 掉入陷阱的数字

#include 

int main()
{
     
    int N,sum,count=1;
    scanf("%d",&N);
	do{
     
		sum=0;
		int temp=N;
		do{
     
			sum+=temp%10;
			temp/=10;
		}while(temp);
		if(N!=3*sum+1)
		{
     
			N=3*sum+1;
			printf("%d:%d\n",count,N);
			++count;
		}
		else
		{
     
			printf("%d:%d",count,N);
			break;
		}
			
	}while(1);
    
    return 0;
}

32. 求交错序列前N项和

#include 

int main()
{
     
    double sum=1,k=-1.0;
    int n,i;
    scanf("%d",&n);
    for(i=2;i<=n;++i)
    {
     
    	sum+=k*i/(2*i-1);
    	k=-k;
	}
    printf("%.3lf",sum);
    return 0;
}

33. 统计素数并求和

#include 

int main()
{
     
    int m,n,i,j,num=0,sum=0;
    scanf("%d %d",&m,&n);
    if(m==0&&n==0)
        printf("0 0");
    else{
     
        if(m==1)
            ++m;
        for(i=m;i<=n;++i){
     
            int count=0;
            for(j=2;j<i;++j){
     
                if(i%j==0)
                    count++;
            }
            if(count==0)
            {
     
                num++;
                sum+=i;
            }
		}
    }
	printf("%d %d",num,sum);
    return 0;
}

34. 求分数序列前N项和

#include 
int main()
{
     
    long long n;
    scanf("%lld",&n);
    double a=2,b=1;
    double sum=0;
    for(long long i=0;i<n;++i)
    {
     
        sum+=(a*1.0)/b;
        double tmp=a;
        a=a+b;
        b=tmp;
    }
    printf("%.2lf",sum);
    return 0;
}

35. 猴子吃桃问题

#include 
int main()
{
     
    int n;
    scanf("%d",&n);
    int num=1;
    for(int i=0;i<n-1;++i)
    {
     
        num=(num+1)*2;
    }
    printf("%d",num);
    return 0;
}

36. 韩信点兵

#include 
int main()
{
     
    int i=1,n;
    while(1){
     
    	n=11*i+10;
    	if(n%7==4&&n%6==5&&n%5==1)
    	{
     
    		printf("%d",n);
    		break;
		}
		++i;
	}
    return 0;
}

37. 输出整数各位数字

奇技淫巧

#include 
int main()
{
     
    int n;
    while(scanf("%1d",&n)!=EOF)
    {
     
        printf("%d ",n);
    }
    return 0;
}

38. 支票面额

#include 
int main()
{
     
    int y,f,n,flag=1;
    scanf("%d",&n);
    for(y=0;y<50;++y)
    {
     
    	for(f=2*y+1;f<100;++f)
    		if(f*98-y*199==n)
    		{
     
    			printf("%d.%d",y,f);
				flag=0;
				break;	
			}
	}
	if(flag)
		printf("No Solution");
    return 0;
}

39. 龟兔赛跑

#include 
int main()
{
     
    int T,s;
    scanf("%d",&T);
    int t1=T/90,t2=T%90;
    if(t2==0||t2==30||t2==45||t2==60)
    {
     
    	printf("-_- %d",t1*270+t2*3);
	}
	else if((t2>0&&t2<30)||(t2>45&&t2<60))
	{
     
		printf("^_^ ");
		if(t2<10)
			printf("%d",t1*270+t2*9);
		else if(t2<30)
			printf("%d",t1*270+10*9);
        else if(t2<50)
            printf("%d",t1*270+135+(t2-45)*9);
        else if(t2<60)
            printf("%d",t1*270+180);
	}
	else
		printf("@_@ %d",3*T);
    return 0;
}

40. 到底是不是太胖了

#include 
int main()
{
     
    int n;
    int h,w;
    double d;
    scanf("%d",&n);
    for(int i=0;i<n;++i)
    {
     
        scanf("%d %d",&h,&w);
        d=(h-100)*0.9*2;
        if( d>=w&&d-w < d*0.1 || d<w&&w-d < d*0.1 )
            printf("You are wan mei!\n");
        else if(w-d+d*0.1<1e-4)
            printf("You are tai shou le!\n");
        else if(w-d-1*d*0.1>-1e-4)
            printf("You are tai pang le!\n");
    }
    return 0;
}

41. 计算阶乘和

#include 
int main()
{
     
    
    int i,N,sum=0,jc=1;
    scanf("%d",&N);
    for(i=1;i<=N;++i)
    {
     
    	jc*=i;
    	sum+=jc;
	}
	printf("%d",sum);
    return 0;
}

42. 整除光棍

#include 
#include
int main()
{
     
    int n,cnt=0,flag=1,num=1,t;
    scanf("%d",&n);
    while(1)
    {
     
        t=num/n;
        if(flag&&t==0);
        else
        {
     
            flag=0;
            printf("%d",t);
        }
        ++cnt;
        if(num%n)
            num=(num%n)*10+1;
        else
        {
     
            printf(" %d",cnt);
            break;
        }
    }
    return 0;
}

43. Shuffling Machine

奇技淫巧

#include 
#include
int main()
{
     
    int a[55],b[55],c[55];
    for(int i=0;i<55;++i)
    {
     
        scanf("%d",&a[i]);
        c[i]=b[i]=i;
    }
    char ch[54][4]={
     "S1","S2","S3","S4","S5","S6","S7","S8","S9","S10","S11","S12","S13",
"H1","H2","H3","H4","H5","H6","H7","H8","H9","H10","H11","H12","H13",
"C1","C2","C3","C4","C5","C6","C7","C8","C9","C10","C11","C12","C13",
"D1","D2","D3","D4","D5","D6","D7","D8","D9","D10","D11","D12","D13","J1","J2"};
    for(int i=1;i<55;++i)
    {
     
        int pos=i;
        for(int j=0;j<a[0];++j)
        {
     
            pos=a[pos];
        }
        b[pos]=i;
    }
    for(int j=1;j<55;++j)
    {
     
        if(j!=1)printf(" ");
        printf("%s",ch[b[j]-1]);
    }
    return 0;
}

44. 黑洞数

#include 

int cha(int k,int *min,int *max){
     
	int a[3],i,j;
	for(i=0;i<3;++i)
    {
     
    	a[i]=k%10;
    	k/=10;
	}
	for(i=3;i>0;--i)
	{
     
		for(j=0;j<i-1;++j)
		{
     
			if(a[j]>a[j+1])
			{
     
				int temp=a[j];
				a[j]=a[j+1];
				a[j+1]=temp;
			}
		}
	}
	*min=100*a[0]+10*a[1]+a[2];
	*max=100*a[2]+10*a[1]+a[0];
	int t=*max-*min;
	return t;
}

int main(){
     
    int k,min=0,max=0,res;
    scanf("%d",&k);
    int cnt=0;
    if(k==495)
    {
     
        ++cnt;
        k=cha(k,&min,&max);
		printf("%d: %d - %d = %d\n",cnt,max,min,k);
    }
    else
    while(k!=495)
    {
     
        ++cnt;
	    k=cha(k,&min,&max);
		printf("%d: %d - %d = %d\n",cnt,max,min,k);
	}
    return 0;
}

45. 找完数

#include 

int wanshu(int num,int a[]){
     
	int i,sum=0,j=0,flag=0;
	for(i=1;i<num;++i){
     
		if(num%i==0)
		{
     
			a[j]=i;
			++j;
			sum+=i;
		}
	}
	if(sum==num)
		flag=1;
	return flag;
}

int main(){
     
    int n,m,a[1500]={
     0},i,j,cnt=0;
    scanf("%d %d",&m,&n);
    for(i=m;i<=n;++i)
    {
     
    	if(wanshu(i,a))
    	{
     
            ++cnt;
    		printf("%d = ",i);
    		for(j=0;a[j]!=0;++j)
    		{
     
    			printf("%d",a[j]);
    			if(a[j+1]!=0)
    				printf(" + ");
			}
			printf("\n");
		}
		for(j=0;j<50;++j)
		{
     
			a[j]=0;
		}
	}
    if(!cnt)
        printf("None");
    return 0;
}

46. 爬动的蠕虫

#include 

int main(){
     
    int n,u,d,l=0,t=0;
    scanf("%d %d %d",&n,&u,&d);
    while(l<n)
    {
     
        l+=u;
        t+=1;
        if(l>=n)
            break;
        t+=1;
        l-=d;
    }
    printf("%d",t);
    return 0;
}

47. 二进制的前导的零

#include 

int main(){
     
    int n,cnt=0;
    scanf("%d",&n);
    if(n<0)printf("0");
    else
    {
     
        while(n)
        {
     
            ++cnt;
            n/=2;
        }
        printf("%d",32-cnt);
    }
    return 0;
}

48. 求组合数

奇技淫巧

#include 

int main(){
     
    int m,n;
    double res=1;
    scanf("%d %d",&m,&n);
    for(int i=0;i<m;++i)
    {
     
        res*=(n-i)*1.0/(m-i);
    }
    printf("result = %.lf",res);
    return 0;
}

49. Have Fun with Numbers

#include 
#include
int main(){
     
    char ch[21],res[22];
    int a[10]={
     0};
    scanf("%s",ch);
    int len=strlen(ch),flag=0,jw=0,t;
    for(int i=len-1;i>=0;--i)
    {
     
        t=(ch[i]-'0')*2+jw;
        jw=0;
        if(t>9)
            jw=1;
        res[i+1]='0'+t%10;
        ++a[ch[i]-'0'];
    }
    if(jw==1)
    {
     
        res[0]='1';
        ++a[1];
    }
    else
    {
     
        res[0]='0';
        flag=1;
    }
    ++len;
    for(int i=flag;i<len;++i)
    {
     
        --a[res[i]-'0'];
    }
    int jd=1;
    for(int i=0;i<10;++i)
    {
     
        if(a[i])
        {
     
            jd=0;
            break;
        }
    }
    if(jd)
        printf("Yes\n");
    else
        printf("No\n");
    for(int i=flag;i<len;++i)
        printf("%c",res[i]);
    return 0;
}

50. 输出华氏-摄氏温度转换表

#include
int main(){
     
    int lower,upper;
    double cel;
    scanf("%d %d",&lower,&upper);
    if(lower<=upper)
    {
     
        printf("fahr celsius\n");
        for(int i=lower;i<=upper;i+=2)
        {
     
            cel=5.0*(i-32)/9;
            printf("%d%6.1lf\n",i,cel);
        }
    }
    else
    {
     
        printf("Invalid.");
    }
    return 0;
}

51. 求奇数分之一序列前N项和

#include
int main(){
     
    int n;
    scanf("%d",&n);
    double sum=0;
    for(int i=0;i<n;++i)
    {
     
        sum+=1.0/(i*2+1);
    }
    printf("sum = %.6lf",sum);
    return 0;
}

52. 求简单交错序列前N项和

#include
int main(){
     
    int n,k=1;
    scanf("%d",&n);
    double sum=0;
    for(int i=0;i<n;++i)
    {
     
        sum+=1.0*k/(i*3+1);
        k=-k;
    }
    printf("sum = %.3lf",sum);
    return 0;
}

53. 生成3的乘方表

#include
int main(){
     
    int n;
    long long t=1;
    scanf("%d",&n);
    for(int i=0;i<=n;++i)
    {
     
        printf("pow(3,%d) = %lld\n",i,t);
        t*=3;
    }
    return 0;
}

54. 求阶乘序列前N项和

#include
int main(){
     
    int n;
    long long t=1,sum=0;
    scanf("%d",&n);
    for(int i=1;i<=n;++i)
    {
     
        t*=i;
        sum+=t;
    }
    printf("%lld",sum);
    return 0;
}

55. 查询水果价格

#include
int main(){
     
    printf("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit\n");
    char ch[4][7]={
     "apple","pear","orange","grape"};
    double a[4]={
     3.00,2.50,4.10,10.20};
    int i,t;
    for(i=0;i<5;++i)
    {
     
        scanf("%d",&t);
        if(t==0)
            break;
        else
        {
     
            printf("price = %.2lf\n",a[t-1]);
        }
    }
    return 0;
}

56. 求给定精度的简单交错序列部分和

#include
int main(){
     
    double x,sum;
    scanf("%lf",&x);
    int i=1,k=1;
    while(1)
    {
     
        sum+=k*1.0/i;
        if(1.0/i<=x)
            break;
        i+=3;
        k=-k;
    }
    printf("sum = %.6lf",sum);
    return 0;
}

57. 求e的近似值

#include

int main()
{
     
    int n;
    scanf("%d",&n);
    double jc=1.0,sum=1;
    for(int i=1;i<=n;++i)
    {
     
        jc/=i;
        sum+=jc;
    }
    printf("%.8lf",sum);
    return 0;
}

58. 求幂级数展开的部分和

#include
int main()
{
     
    double x,t,sum=1;
    scanf("%lf",&x);
    t=x;
    int i=1;
    while(t>=0.00001||t<=-0.00001)
    {
     
        sum+=t;
        ++i;
        t*=x*1.0/i;
    }
    sum+=t;
    printf("%.4lf",sum);
    return 0;
}

59. 打印菱形图案

#include
int main()
{
     
    int n;
    scanf("%d",&n);
    for(int i=0;i<(n+1)/2;++i)
    {
     
        for(int j=n-2-i*2;j>=0;--j)
        {
     
            printf(" ");
        }
        for(int j=0;j<2*i+1;++j)
        {
     
            printf("* ");
        }
        printf("\n");
    }
    for(int i=0;i<n/2;++i)
    {
     
        for(int j=0;j<i+1;++j)
        {
     
            printf("  ");
        }
        for(int j=(n-i*2-2);j>0;--j)
        {
     
            printf("* ");
        }
        printf("\n");
    }
    return 0;
}

60. Welcome to You!

#include
int main()
{
     
    printf("Welcome to You!");
    return 0;
}

61. Programming in C is fun!

#include
int main()
{
     
    printf("Programming in C is fun!");
    return 0;
}

62. 计算物体自由下落的距离

#include
int main()
{
     
    printf("height = %.2lf",10.0*3*3/2);
    return 0;
}

63. 高空坠球

#include
int main()
{
     
    int h,n,i;
    scanf("%d %d",&h,&n);
    double sum=h,t=h;
    for(int i=0;i<n-1;++i)
    {
     
        sum+=t;
        t/=2;
    }
    if(n)
    printf("%.1lf %.1lf",sum,t/2);
    else
    printf("0.0 0.0");
}

64. 统计大写辅音字母

#include
#include

int main()
{
     
    int cnt=0,i;
    char ch[81];
    scanf("%[^\n]",ch);
    int len=strlen(ch);
    for(int i=0;i<=len;++i)
    {
     
        if(ch[i]>'A'&&ch[i]<='Z'&&ch[i]!='E'&&ch[i]!='O'&&ch[i]!='U'&&ch[i]!='I')
            ++cnt;
    }
    printf("%d",cnt);
    return 0;
}

65. 字符串替换

#include
#include

int main(){
     
    char ch[81];
    gets(ch);
    int n = strlen(ch);
    for(int i=0;i<n;++i){
     
        if(ch[i]>='A'&&ch[i]<='Z'){
     
            ch[i]='A'+(25-(ch[i]-'A'));
        }
    }
    printf("%s",ch);
    return 0;
}

66. 时间换算

#include

int main(){
     
    int h,m,s;
    scanf("%d:%d:%d",&h,&m,&s);
    int n;
    scanf("%d",&n);
    int p,q,r,t,u;
    p=(s+n)%60;
    q=(s+n)/60;
    r=(q+m)%60;
    t=(q+m)/60;
    u=(t+h)%24;
    printf("%02d:%02d:%02d",u,r,p);
    return 0;
}

67. What is a computer?

#include
int main(){
     
    printf("What is a computer?");
    return 0;
}

68. 求N分之一序列前N项和

#include

int main(){
     
    int n;
    scanf("%d",&n);
    double sum=0;
    for(int i=0;i<n;++i){
     
        sum+=1.0/(i+1);
    }
    printf("sum = %lf",sum);
    return 0;
}

69. 换硬币

#include

int main(){
     
    int n;
    scanf("%d",&n);
    int count=0;
    int total,remain;
    int c=n/5;
    for(int i=0;i<c;++i){
     
        int k = c-i;
        remain=n-k*5;
        int d=remain/2;
        for(int j=0;j<d;++j){
     
            int p = d-j;
            int remain1=remain-p*2;
            if(!remain1)
                continue;
            printf("fen5:%d, fen2:%d, fen1:%d, total:%d\n",k,p,remain1,k+p+remain1);
            ++count;
        }
    }
    printf("count = %d",count);
    return 0;
}

70. 输出三角形面积和周长

#include
#include
int main(){
     
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    if(a+b<=c||a+c<=b||b+c<=a){
     
        printf("These sides do not correspond to a valid triangle");
    }
    else{
     
        double s = (a+b+c)/2.0;
        double area = sqrt(s*(s-a)*(s-b)*(s-c)),cir = a+b+c;
        printf("area = %.2lf; perimeter = %.2lf",area,cir);
    }
    return 0;
}

71. 求平方与倒数序列的部分和

#include

int main(){
     
    int m,n;
    double sum=0;
    scanf("%d %d",&m,&n);
    for(int i=m;i<=n;++i){
     
        sum+=i*i+1.0/i;
    }
    printf("sum = %lf",sum);
    return 0;
}

72. 三天打鱼两天晒网

#include

int main(){
     
    int n;
    scanf("%d",&n);
    if(n%5<=3&&n%5){
     
        printf("Fishing in day %d",n);
    }
    else{
     
        printf("Drying in day %d",n);
    }
}

73. 比较大小

#include
int main(){
     
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if(a>b){
     
        int tmp = a;
        a=b;
        b=tmp;
    }
    if(a>c){
     
        int tmp=c;
        c=b;
        b=a;
        a=tmp;
    }
    if(b>c){
     
        int tmp=b;
        b=c;
        c=tmp;
    }
    printf("%d->%d->%d",a,b,c);
}

74. 三角形判断

#include
#include
int main()
{
     
	double a,b,c,x1,y1,x2,y2,x3,y3,A,p;
    scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3);
	a=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
	b=sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));
	c=sqrt((x3-x2)*(x3-x2)+(y3-y2)*(y3-y2));
	if (a+b<=c || b+c<=a || a+c<=b)
    {
     
        printf("Impossible");
    }
	else
	{
     
        p=(a+b+c)/2;
        A=sqrt(p*(p-a)*(p-b)*(p-c));
        printf("L = %.2f, A = %.2f",2*p,A);
	}
    return 0;
}

75. 整数152的各位数字

#include

int main(){
     
    printf("152 = %d + %d*10 + %d*100",152%10,152/10%10,152/100);
    return 0;
}

76. 计算分段函数[3]

#include
int main(){
     
    double x;
    scanf("%lf",&x);
    if(x>10-1e-6&&x<10+1e-6){
     
        printf("f(%.1lf) = %.1lf",x,1.0/x);
    }else{
     
        printf("f(%.1lf) = %.1lf",x,x);
    }
    return 0;
}

77. 求1到100的和

#include
int main(){
     
    int sum = 0;
    for(int i=1;i<101;++i){
     
        sum+=i;
    }
    printf("sum = %d",sum);
    return 0;
}

78. 计算油费

#include

int main(){
     
    int a,b;
    char c;
    scanf("%d %d %c",&a,&b,&c);
    double discount = c=='m'?0.95:0.97;
    double price = b==90?6.95:b==93?7.44:7.93;
    double sum = a * price *discount;
    printf("%.2lf",sum);
    return 0;
}

79. N个数求和

80. 打折

81. 2018我们要赢

82. 打印沙漏

83. 币值转换

84. 连续因子

85. 温度转换

86. 整数四则运算

87. 计算分段函数[1]

88. 计算分段函数[2]

89. 阶梯电价

90. 统计字符

91. 输出闰年

92. 特殊a串数列求和

93. 水仙花数

94. 计算华氏温度

95. 计算火车运行时间

96. 计算存款利息

97. 计算个人所得税

98. 两个数的简单计算器

99. 打印九九口诀表

100. 逆序的三位数

101. 人民币兑换

102. 大笨钟

103. A除以B

104. 新世界

105. 寻找250

106. 求平方根序列前N项和

107. 找出最小值

108. 将x的平方赋值给y

109. 计算工资

110. 求符合给定条件的整数集

111. 求特殊方程的正整数解

112. 约分最简分式

113. 单词长度

114. 谁先倒

115. 小于m的最大的10个素数

116. 计算圆周率

117. 整数的分类处理

118. 分队列

119. 我是升旗手

120. 兔子繁殖问题

121. 作品评分

122. 3n+1

123. 空心字母金字塔

124. 上三角数字三角形

125. 又来一个上三角数字三角形

126. 时间差

127. Sum of the digits