How will you write a function with no arguments and with return value ? Give an example.

Ans. #include<stdio.h>

void area();  // Prototype Declaration

void main()

{

area();

}

void area()

{

    float area_circle;

    float rad;

    printf("\nEnter the radius : ");

    scanf("%f",&rad);

    area_circle = 3.14 * rad * rad ;

    printf("Area of Circle = %f",area_circle);

}

Output :

Enter the radius : 3

Area of Circle = 28.260000