Question

我试图让它停止但我不太确定该怎么做。我刚开始学习它。当我输入-99时，我希望它停止。

非常感谢任何帮助！

这就是我所拥有的：

#include <stdio.h>
#define SIZE 5
int main(void)
{
    int hot=0, pleasant=0, cold=0;
    int sum=0, i, temp;
    double average;

    for(i=0; i<SIZE; i++)
    {
        printf("Enter temperature %d> (-99 to stop)",i+1);
        scanf("%d",&temp);
        sum +=temp;

         if(temp >= 85)
        {
            ++hot;
        }

        else if(temp >= 60 && temp <= 84)
        {
            ++pleasant;
        }

        else
        {
            ++cold;
        }
    }
    average = (double) sum/SIZE;

    printf("The Collection of hot days is %d\n",hot);
    printf("The Collection of pleasant days is %d\n",pleasant);
    printf("The Collection of cold days is %d\n",cold);
    printf("The Average temperature is %.2f\n",average);
    return(0);
}

Answer 1

你只需要摆脱循环：

if (temp == -99)
  break;

但是您的代码还有其他几个问题，例如，如果您提前退出，则平均计算将会出错。这是一个更正版本，也使用其他循环控制字continue。

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    char *buffer;
    size_t buffer_len;
    int hot=0, pleasant=0, cold=0;
    int sum=0, i=0, temp;
    double average;

    while(1)
    {
        printf("Enter temperature %d> (-99 to stop)",i);

        buffer = NULL;
        getline(&buffer, &buffer_len, stdin);
        if (buffer_len == 0 || sscanf(buffer, "%d\n",&temp) != 1)
        {
            if (buffer)
              free(buffer);
            printf("Invalid\n");
            continue;
        }

        free(buffer);

        if(temp == -99)
          break;

        sum +=temp;
        ++i;

        if(temp >= 85)
        {
            ++hot;
            continue;
        }

        if(temp >= 60)
        {
            ++pleasant;
            continue;
        }

        ++cold;
    }

    if (i == 0)
    {
      printf("No temperatures entered\n");
      return -1;
    }

    average = (double)sum / i;

    printf("The Collection of hot days is %d\n",hot);
    printf("The Collection of pleasant days is %d\n",pleasant);
    printf("The Collection of cold days is %d\n",cold);
    printf("The Average temperature is %.2f\n",average);
    return 0;
}

如何在编程c语言中停止输入

1 个答案: