Question

Write a complete C program with a helper function that reads an integer from the keyboard and prints its factorial to the standard output

Answer 1

#include <stdio.h>

long factorial(int);

int main()

{

int number;

long fact = 1;

printf("Enter an integer to calculate its 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;

}