此文为本人在练习 菜鸟教程C语言经典100例 时所写的部分代码记录（1~20）
#include
int main(void)
{
int i,j,k;
for(i = 1;i < 5;i++)
{
for(j = 1;j < 5;j++)
{
if(i == j)
continue;
for(k = 1;k < 5;k++)
{
if(i == k || j == k)
continue;
printf("%d,%d,%d\n",i,j,k);
}
}
}
return 0;
}
#include
#include
int main(void)
{
int flag = 0;
long n = -10000;
while(n < 10000)
{
if(n + 100 == (int)sqrt(n + 100) * sqrt(n + 100) && n + 268 == (int)sqrt(n + 268) * sqrt(n + 268))
{
printf("%ld\n",n);
}
n++;
}
return 0;
}
#include
int IsLeap(int year)
{
if((year%4==0&&year%100!=0)||(year%400==0))
return 1;
else
return 0;
}
int main(void)
{
int monthday[2][13] = {{0,31,28,31,30,31,30,31,31,30,31,30,31},
{0,31,29,31,30,31,30,31,31,30,31,30,31}};
int year,month,day;
int sum = 0;
printf("请输入年、月、日，格式为：年,月,日（2015,12,10）\n");
scanf("%d,%d,%d",&year,&month,&day);
if(IsLeap(year))
{
for(int i = 0; i < month; i++)
{
sum += monthday[1][i];
}
}
else
{
for(int i = 0; i < month; i++)
{
sum += monthday[0][i];
}
}
sum += day;
printf("这是这一年的第 %d 天。",sum);
return 0;
}
#include
int main(void)
{
int x,y,z,temp,min,max;
printf("请输入三个数字:\n");
scanf("%d%d%d",&x,&y,&z);
temp = x < y? x : y;
min = temp < z? temp : z;
temp = x < y? y : x;
max = temp < z? z : temp;
printf("从小到大排序:");
printf("%d%3d%3d",min,x + y + z - min - max,max);
return 0;
}
#include
int main(void)
{
int i, j;
for(i = 1;i < 10; i++)
{
for(j = 1;j <= i; j++)
{
printf("%d*%d=%d ",i,j,i*j);
}
printf("\n");
}
return 0;
}
#include
int main(void)
{
int i;
int f1 = 1;
int f2 = 1;
for(i = 1; i <=40; i++)
{
if(i == 1)
printf("%12d",f1);
else
{
f2 = f1 + f2;
f1 = f2 - f1;
printf("%12d",f1);
}
if(i%4 == 0)
printf("\n");
}
return 0;
}
#include
#include
int IsPrime(int n)
{
int i;
for(i = 2; i <= sqrt(n); i++)
{
if(n%i == 0)
return 0;
}
return 1;
}
int main(void)
{
int i, j = 0;
for(i = 101; i <= 200; i++)
{
if(IsPrime(i))
{
printf("%d ",i);
j++;
if(j%5 == 0)
printf("\n");
}
}
return 0;
}
#include
int IsSXH(int n)
{
int a,b,c,num;
num = n;
c = n%10;
n = n/10;
b = n%10;
a = n/10;
if(num == a*a*a + b*b*b + c*c*c)
return 1;
else
return 0;
}
int main(void)
{
int i;
for(i = 100; i < 1000; i++)
{
if(IsSXH(i))
printf("%d\n",i);
}
return 0;
}
#include
int main(void)
{
int n,count = 1,num,i = 2;
printf("请输入整数：");
scanf("%d",&n);
num = n;
while(i < num)
{
if(n%i == 0)
{
if(count == 1)
printf("%d=%d",n,i);
else
printf("*%d",i);
count++;
n = n/i;
}
else
i++;
}
return 0;
}
#include
int gcd(int m,int n);
int min(int m,int n,int g);
int main(void)
{
int m,n,g1,g2;
printf("请输入两个数字：\n");
scanf("%d%d",&m,&n);
g1 = gcd(m,n);
g2 = min(m,n,g1);
printf("这两个数的最大公约数是%d，最小公倍数是%d",g1,g2);
return 0;
}
int gcd(int m,int n)
{
int r;
while(n!=0)
{
r = m % n;
m = n;
n = r;
}
return m;
}
int min(int m,int n,int g)
{
return m*n/g;
}
#include
int main(void)
{
char ch;
int alpha,num,space,others;
alpha = num = space = others = 0;
printf("请输入一些字母：\n");
while((ch = getchar()) != '\n')
{
if((ch >= 'a' && ch <= 'z')||(ch >='A' && ch <='Z'))
alpha++;
else if(ch >= '0' && ch <= '9')
num++;
else if(ch == ' ')
space++;
else
others++;
}
printf("字母=%d,数字=%d,空格=%d,其他=%d",alpha,num,space,others);
return 0;
}
#include
long N_A(int a,int n);
int main(void)
{
int a,n;
printf("请输入 a 和 n：\n");
scanf("%d%d",&a,&n);
printf("a+aa+...=%ld",N_A(a,n));
return 0;
}
long N_A(int a,int n)
{
long sum = 0;
long temp = a;
while(n)
{
sum += temp;
temp = temp*10 + a;
n--;
}
return sum;
}
#include
int Perfect(int n);
int main(void)
{
int i,j,count;
for(i = 1; i <= 1000; i++)
{
if(Perfect(i))
{
count = 1;
printf("%d=",i);
for(j = 1; j < i; j++)
{
if(i % j == 0 && count == 1)
{
printf("%d",j);
count++;
}
else if(i % j == 0 && count != 1)
{
printf("+%d",j);
count++;
}
}
printf("\n");
}
}
return 0;
}
int Perfect(int n)
{
int sum = 0;
for(int i = 1; i < n; i++)
{
if(n%i == 0)
sum += i;
}
if(n == sum)
return 1;
else
return 0;
}
#include
int main(void)
{
float h = 100,sum = 0;
int count = 0;
while(count < 10)
{
if(count == 0)
{
sum += h;
h = h / 2;
}
else
{
sum += h*2;
h = h / 2;
}
count++;
}
printf("第10次落地时，共经过%.6f米，第10次反弹高%.6f米\n",sum,h);
return 0;
}
