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有人可以解释为什么 .exe 程序没有运行，尽管 turbo c++ 编译器没有显示任何错误？

编译器没有显示任何错误

#include <stdio.h>
#include <conio.h>

int main ()
{
int choice;
float num, result;
printf("Select your choice\n");
printf("Press 1 for conversion from milligrams to grams\n");
printf("Press 2 for conversion from decigrams to grams\n");
printf("Press 3 for conversion from centigrams to grams\n");
printf("Press 4 for conversion from kilograms to grams\n");
printf("Press 5 for conversion from ounce to grams\n");
printf("Press 6 for conversion from pounds to grams\n");
printf("Press 7 for conversion from ton to grams\n");

switch(choice) //i thought the switch statement would be appropriate
{
case 1:
        printf("Enter the weight in milligrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.001;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 2:
        printf("Enter the weight in decigrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.1;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 3:
        printf("Enter the weight in centigrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.01;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 4:
        printf("Enter the weight in kilograms for conversion\n");
        scanf("&#37;f", &num);

        result=num*1000.0;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 5:
        printf("Enter the weight in ounce for conversion\n");
        scanf("&#37;f", &num);

        result=num*28.3495;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 6:
        printf("Enter the weight in pounds for conversion\n");
        scanf("&#37;f", &num);

        result=num*453.592;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

case 7:
        printf("Enter the weight in ton for conversion\n");
        scanf("&#37;f", &num);

        result=num*907185.00;

        printf("The weight in after conversion is %f g", result);
        getch();
        getch();
        break;

default:
        printf("invalid choice\n");
        break;
        }
        return 0;
        }

我对c比较陌生，我不知道我的错误是什么

4

3 回答 3

5

您的变量choice未初始化且从未写入。在提示用户输入后，您需要实际扫描输入的值。

于 2013-09-09T09:43:23.087 回答
1

在 switch 语句中检查之前，首先获取用户选择的输入。希望这可以帮助 

#include <stdio.h>
#include <conio.h>

int main ()
{
int choice;
float num, result;
printf("Select your choice\n");
printf("Press 1 for conversion from milligrams to grams\n");
printf("Press 2 for conversion from decigrams to grams\n");
printf("Press 3 for conversion from centigrams to grams\n");
printf("Press 4 for conversion from kilograms to grams\n");
printf("Press 5 for conversion from ounce to grams\n");
printf("Press 6 for conversion from pounds to grams\n");
printf("Press 7 for conversion from ton to grams\n");

scanf("%d",&choice);        //Added this line

switch(choice) //i thought the switch statement would be appropriate
{
case 1:
        printf("Enter the weight in milligrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.001;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 2:
        printf("Enter the weight in decigrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.1;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 3:
        printf("Enter the weight in centigrams for conversion\n");
        scanf("&#37;f", &num);

        result=num*0.01;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 4:
        printf("Enter the weight in kilograms for conversion\n");
        scanf("&#37;f", &num);

        result=num*1000.0;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 5:
        printf("Enter the weight in ounce for conversion\n");
        scanf("&#37;f", &num);

        result=num*28.3495;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 6:
        printf("Enter the weight in pounds for conversion\n");
        scanf("&#37;f", &num);

        result=num*453.592;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

case 7:
        printf("Enter the weight in ton for conversion\n");
        scanf("&#37;f", &num);

        result=num*907185.00;

        printf("The weight in after conversion is %f g", result);
        getch();
        break;

default:
        printf("invalid choice\n");
        break;
       }
        return 0;
  }

另外，在您的情况下，我不理解使用的格式说明符scanf("&#37;f", &num);，我使用过scanf("%f",&num);

于 2013-09-09T09:56:07.677 回答
1

您应该在切换之前使用 scanf 。它不起作用，因为您没有为“选择”分配任何值。仅使用一个 scanf 并在切换之前使用它。

于 2013-09-09T09:42:36.490 回答