perimeter of rect. using functions

#include<stdio.h>

#include<conio.h>

void main()

{ int perimeter(int,int);

int l,b,c;

printf("enter the l and b");

scanf("%d%d",&l,&b);

c=perimeter(l,b);

printf("perimeter rect is %d",c);

getch();

}

int perimeter(int l, int b)

{int c;

c=2*(l+b);

return c;

}