Menu-Driven program using Switch-case in C

Prerequisite : Switch Case in C

Problem Statement:
Write a menu-driven program using Switch case to calculate the following:
1. Area of circle
2. Area of square
3. Area of sphere

Also use functions input() and output() to input and display respective values.

// C program to illustrate 
// Menu-Driven program 
// using Switch-case 
  
#include <stdio.h> 
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); 
} 

Output:

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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