PTA:浙大版《C语言程序设计（第3版）》题目集

练习2-1 Programming in C is fun!

#include 

int main()
{
    printf("Programming in C is fun!");
    
    return 0;
}
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练习2-3 输出倒三角图案

#include 

int main()
{
    printf("* * * *\n");
    printf(" * * *\n");
    printf("  * *\n");
    printf("   *\n");
    
    return 0;
}
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练习2-4 温度转换

#include 

int main()
{
    int fahr,celsius;
    fahr = 150;
    celsius = 5 * (fahr - 32 ) / 9;
    printf("fahr = %d, celsius = %d",fahr,celsius);
    return 0;
}
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练习2-6 计算物体自由下落的距离（错误）

#include 

int main()
{
    int t = 3;
    printf("height = %lf",100-0.5*10*t*t);
    return 0;
}
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练习2-8 计算摄氏温度

#include

int main(){
  int far;
  int cel;
  scanf("%d",&far);
  cel = 5 * ( far - 32)/9;
  printf("Celsius = %d",cel);
  return 0;
}
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练习2-9 整数四则运算

#include

int main()
{
  int a,b;
  scanf("%d %d",&a,&b);
  printf("%d + %d = %d\n",a,b,a+b);
  printf("%d - %d = %d\n",a,b,a-b);
  printf("%d * %d = %d\n",a,b,a*b);
  printf("%d / %d = %d\n",a,b,a/b);
  return 0;
}
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练习2-10 计算分段函数[1]

#include

int main(){
  double x;
  double f;
  int type = 2;
  scanf("%lf",&x);
  if (x == 0) type = 0;
  switch(type){
  case 0: 
    f = 0;
    break;
  default:
    f = 1/x;
    break;
  }
  printf("f(%.1lf) = %.1lf",x,f);
  return 0;
}
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练习2-11 计算分段函数[2]

#include
#include

int main(){
  double x;
  double f;
  scanf("%lf",&x);
  int type;
  if (x >= 0 ) 
    type = 1;
  else type = 2;
  switch(type){
    case 1: 
      f = sqrt(x);
      break;
    case 2:
      f = pow(x+1,2) + 2*x + 1/x;
      break;
  }
  printf("f(%.2lf) = %.2lf",x,f);
  return 0;
}
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练习2-12 输出华氏-摄氏温度转换表（错误）

#include

int main(){
    int lower,upper;
    int fahr;
    double cel;
    scanf("%d %d",&lower,&upper);
    if (lower <= upper){
        fahr = lower;
        printf("fahr celsius\n");
        do{
            cel = 5.0*(fahr-32)/9.0;
            printf("%d   %6.1f\n",fahr,cel);
            fahr +=2;
        }while(fahr <= upper);
    }
    else
        printf("Invalid.");
    return 0;
}
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练习2-13 求N分之一序列前N项和（错误） #include

int main(){
  int n;
  scanf("%d",&n);
  double sum = 0.0;
  int count = 1;
  do{
    sum = sum + 1/count;
    count++;
  }while(count <= n);
  printf("sum = %.6lf",sum);
  return 0;
}
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练习2-14 求奇数分之一序列前N项和（错误）

#include

int main(){
  int n;
  double sum = 0;
  scanf("%d",&n);
  do{
    sum += 1/n;
    n--;
  }while(n > 0);
  printf("%.6lf",sum);
  return 0;
}
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练习2-15 求简单交错序列前N项和（错误）

#include

int main()
{
    int n;
    scanf("%d\n",&n);
    double sum;
    int i = 1;
    int k = 1;
    while(k < n){
        sum += 1/i;
        i += 3;
        k++;
    }
    printf("sum = %.3f",sum);
    return 0;
}
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转载于:https://juejin.im/post/5cb9d9b06fb9a06876103a2c