📜  在C中使用Switch-case的菜单驱动程序

📅  最后修改于: 2021-05-28 03:45:51             🧑  作者: Mango

先决条件:在C中切换大小写

问题陈述:
使用Switch case编写一个菜单驱动的程序,以计算以下内容:
1.圆的面积
2.平方面积
3.球体面积

还可以使用函数input()和output()来输入和显示相应的值。

// C program to illustrate
// Menu-Driven program
// using Switch-case
  
#include 
int input();
void output(float);
int main()
{
    float result;
    int choice, num;
    printf("Press 1 to calculate area of circle\n");
    printf("Press 2 to calculate area of square\n");
    printf("Press 3 to calculate area of sphere\n");
    printf("Enter your choice:\n");
    choice = input();
      
    switch (choice) {
    case 1: {
        printf("Enter radius:\n");
        num = input();
        result = 3.14 * num * num;
        printf("Area of sphere=");
        output(result);
        break;
    }
    case 2: {
        printf("Enter side of square:\n");
        num = input();
        result = num * num;
        printf("Area of square=");
        output(result);
        break;
    }
    case 3: {
        printf("Enter radius:\n");
        num = input();
        result = 4 * (3.14 * num * num);
        printf("Area of sphere=");
        output(result);
        break;
    }
    default:
        printf("wrong Input\n");
    }
    return 0;
}
int input()
{
    int number;
    scanf("%d", &number);
    return (number);
}
  
void output(float number)
{
    printf("%f", number);
}

输出:

Press 1 to calculate area of circle
Press 2 to calculate area of square
Press 3 to calculate area of sphere
Enter your choice:
1
Enter radius:
5
Area of circle=78.5

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