factorial c

#include <stdio.h>
#include <stdlib.h>
void calculate();
int main()
{
    int number=0,cont=0;
    do
    {
        printf("\nENTER A POSITIVE INTEGER : ");
        scanf("%d",&number);
        while(number < 0){
            printf("\nWRONG INPUT");
            printf("\nENTER A POSITIVE INTEGER : ");
            scanf("%d",&number);
        }
        calculate(number);
        printf("\nDO YOU WANT TO CALCULATE AGAIN : ");
        scanf("%d",&cont);
    }while(cont==1);
    return 0;
}
void calculate(int number)
        {
            int i=1,fact=1;
            if(number==0 || number==1)
            {
                printf("\nTHE FACTORIAL OF %d IS : 1",number);
            }
            else
            {
                for(i=1;i<=number;i++)
                {
                    fact=fact*i;
                }
                printf("\nTHE FACTORIAL OF %d IS  : %d ",number,fact);
            }
        }

/*************************OUTPUT************************************

ENTER A POSITIVE INTEGER : 6

THE FACTORIAL OF 6 IS  : 720
DO YOU WANT TO CALCULATE AGAIN : 1

ENTER A POSITIVE INTEGER : 11

THE FACTORIAL OF 11 IS  : 39916800
DO YOU WANT TO CALCULATE AGAIN : 0

Process returned 0 (0x0)
Press any key to continue.
*/