Question

Create your own function in C that accepts one input number and returns a double number. The themes for the functions should be one of the following: Calculates 3.14 times of the square of input number. For example, if 2 is input then 12.56 should be returned. (e.g. 3.14*2*2 = 12.56)

Answer 1

#include<stdio.h>

int main()

{

int x;

double y;

printf("Enter a number ") ;

scanf("%d",&x) ;

printf("\nEntered number is %d", x) ;

y=3.14*x*x;

printf("\nThe required value is %lf", y) ;

return 0;

}

           

$gcc -o main *.c

$main

Enter a number:

Entered number is 2  

The required value is 12.560000