Q4

#include <stdio.h>
#define pi 3.14
float circle(float x);
float sphere(float x);
float rectangle(float x, float y);

int main()
{
    int r,a,b;
    char d;
    printf("bhai c for circle,s for sphere,r for rectangle. UwU \n");
    scanf("%c", &d);
    switch(d)
    {
        case 'c':
        {
            printf("radius de do bhaiyma plis");
            scanf("%d", &r);
            printf("area is %f", circle(r));
            break;
        }

        case 's':
        {
            printf("radius de do bhaiyma plis");
            scanf("%d", &r);
            printf("area is %f", sphere(r));
            break;
        }

        case 'r':
        {
            printf("radius de do bhaiyma plis");
            scanf("%d %d", &a, &b);
            printf("area is %f", rectangle(a,b));
            break;
        }
    }


    return 0;
}

float circle(float x)
{
    float k;
    k=pi*x*x;
    return k;
}

float sphere(float x)
{   float k;
    k=pi*.75*x*x*x;
    return k;
}

float rectangle(float x, float y)
{   float k;
    k=x*y;
    return k;
}