如何停止无限循环?

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问题描述

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我正在编写一个程序，该程序将计算三角形或正方形的面积，然后提示用户是否要计算另一个.我已经让代码工作到它会计算任一形状的面积，但不会继续执行其余的代码.例如选择正方形，计算面积，然后返回正方形边的提示.我假设这又是永远循环的 while 循环，但不知道如何阻止循环无休止地进行.

I am putting together a program that will calculate the area of either a triangle or a square and then prompt the user whether they wish to calculate another. I've got the code working to the point that it will calculate the area of either shape, but then doesn't continue with the rest of the code. For example is square is selected, the area is calculated and then goes back to the prompt for the square's side. I am assuming that it is again the while looping forever, but don't know how to stop the loop from going on endlessly.

这是我的代码:

 #include<stdio.h>
 #include<math.h>
 
 int main(void)
 
 {
     float sq_side, tri_base, tri_height, Area;
     char shape, cont = 'Y';
     
     printf("Please select the type of shape you desire to calculate the area for:\n");
     printf("                                                                     \n");
     printf("   Square = S                             Triangle = T               \n");
     printf("   -------                                    x                      \n");
     printf("   :     :                                   x x                     \n");
     printf("   :     :                                  x   x                    \n");
     printf("   -------                                 xxxxxxx                   \n");
     printf("                                                                     \n");
     printf("Please select either S or T:");
     scanf("%c", &shape);
     while (cont != 'n' && cont != 'N')
     
        if (shape == 'S' || shape == 's')
        {
            printf("What is the length of the sides of the square?:\n");
            scanf("%f", &sq_side);
         
            Area = pow(sq_side,2);
         
            printf("The area of the square is %.2f.\n", Area);
        }   
         
        else if (shape == 'T' || shape == 't')
        {
            printf("What is the length of the base of the triangle?:\n");
            scanf("%f", &tri_base);
            printf("What is the height of the triangle?:\n");
            scanf("%f", &tri_height);
            
            Area = 0.5 * tri_base * tri_height;
            
            printf("The area of the triangle is %.2f.\n", Area);
        }   
        
        else 
        {
        printf("Error:  You have select an incorrect option.");
        }
        
        printf("Do you wish to calculate a new shape?");
        fflush(stdin);
        scanf("%c", &cont);
        
     return(0);
     
 }
 

推荐答案

您缺少花括号.结果是只有 if 语句(包括 else ifs 链)实际上在循环体中.printf(及更高版本)不是这个复合语句的一部分.

You're missing curly braces. The result was that only the if statement (which includes the chain of else ifs) was actually in the loop body. The printf (and later) is not part of this compound statement.

 while (cont != 'n' && cont != 'N')
 {
    if (shape == 'S' || shape == 's')
    {
        printf("What is the length of the sides of the square?:\n");
        scanf("%f", &sq_side);

        Area = pow(sq_side,2);

        printf("The area of the square is %.2f.\n", Area);
    }   

    else if (shape == 'T' || shape == 't')
    {
        printf("What is the length of the base of the triangle?:\n");
        scanf("%f", &tri_base);
        printf("What is the height of the triangle?:\n");
        scanf("%f", &tri_height);

        Area = 0.5 * tri_base * tri_height;

        printf("The area of the triangle is %.2f.\n", Area);
    }   

    else 
    {
    printf("Error:  You have select an incorrect option.");
    }

    printf("Do you wish to calculate a new shape?");
    fflush(stdin);
    scanf("%c", &cont);
}   

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