PTA:浙大版《C语言程序设计（第3版）》题目集-白红宇

练习2-1 Programming in C is fun!

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

练习2-3 输出倒三角图案

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

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;}复制代码

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;}复制代码

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;}复制代码

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;}复制代码

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;}复制代码

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;}复制代码

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;}复制代码

练习2-13 求N分之一序列前N项和（错误） #include<stdio.h>

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;}复制代码

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;}复制代码

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;}复制代码