factorial program in c using function

1#include<stdio.h>
2int main(){
3  int i,f=1,num;
4 
5  printf("Enter a number: ");
6  scanf("%d",&num);
7 
8  for(i=1;i<=num;i++)
9      f=f*i;
10 
11  printf("Factorial of %d is: %d",num,f);
12  return 0;
13}

1//Factorial of a given number
2#include <stdio.h>
3
4//This function returns factorial of the number passed to it 
5long int factorialOf(int number){
6    long int factorial = 1;
7    while(number){
8        factorial*=number;
9        number-=1;
10    }
11    return factorial;
12}
13
14int main(void) {
15	int n;
16	printf("Find factorial of \n");
17	scanf("%d",&n);
18	printf("\nThe factorial of %d is %ld",n,factorialOf(n));
19	return 0;
20}

1#include <stdio.h>
2 
3int fact(int);
4 
5void main()
6{
7 int no,factorial;
8 
9  	printf("Enter a number to calculate it's factorial\n");
10  	scanf("%d",&no);
11  	factorial=fact(no);
12    printf("Factorial of the num(%d) = %d\n",no,factorial);
13//printf("Factorial of the num(%d) = %d\n",no,fact(no));//another way of calling a function//comment above two lines if you want to use this
14}
15 
16int fact(int n)
17{
18    int i,f=1;
19    for(i=1;i<=n;i++)
20    {
21        f=f*i;
22    }
23    return f;
24}
25

1#include <stdio.h>
2
3int fact (num1);
4
5void main ()
6{
7    int num,ret;
8    
9    printf ("Enter the number: ");
10    scanf("%d",&num);
11
12    ret = fact(num);
13
14    printf("\nthe factorial of %d is %d\n",num,ret);
15
16}
17
18int fact(num1)
19{
20    int i, f=1;
21
22    for(i=1; i<=num1; i++)
23    {
24        f = f * i;
25    }
26
27    return f;
28}
29