Function with arguments and no Return Value :

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Note : 

• Function accepts argument but it does not return a value back to the calling Program .
• It is Single ( One-way) Type Communication
• Generally Output is printed in the Called function 
• Here area is called function and main is calling function.

Program :

#include<stdio.h>
#include<conio.h>
//----------------------------------------
  void area(float rad);  // Prototype Declaration
//----------------------------------------
void main()
{
float rad;
   printf("\nEnter the radius : ");
   scanf("%f",&rad);
   area(rad);
getch();
}
//----------------------------------------
void area(float rad)
{
float ar;
ar = 3.14 * rad * rad ;
printf("Area of Circle = %f",ar);
}

Output :

Enter the radius : 3
Area of Circle = 28.260000

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