Factorial Program in C using Function

/*
Write a program in C to find Factorial Program using Function
*/

#include<stdio.h>

long factorial(int);

main()
{
int number;
long fact = 1;

printf("Enter a number to calculate it's factorial\n");
scanf("%d",&number);

printf("%d! = %ld\n", number, factorial(number));

return 0;
}

long factorial(int n)
{
int c;
long result = 1;

for( c = 1 ; c <= n ; c++ )
result = result*c;

return ( result );
}