area of rect. using functions

#include<stdio.h>
#include<conio.h>
void main()
{int area(int ,int);
int l,b,c;
clrscr();
printf("enter l and b");
scanf("%d%d",&l,&b);
c=area(l,b);
printf("area is %d",c);
getch();
}

int area(int l, int b)
{
int c;
c=(l*b);
return c;
}