Find Factorial program in C language

Factorial program in C language with error solving

/*
Name   : C source program Find Factorial program in C language
Author : Funny Coder(Maniruzzman Akash)
It's a free code. You can use it anywhere
*/

#include <stdio.h>
int main()
{
    int num, total;
    int factorial = 1;      
    printf("\nEnter an integer: ");
    scanf("%d",&num);
    if (num < 0){
    printf("\nPlease enter a positive number ..!!\nTry Again..\n");
}else{
       for(total = 1; total <= num; total++)  
       {
          factorial *= total;              /* fac= fac*total */
       }
    printf("\nFactorial = %d\n",factorial);
    }
    return 0;
}

Look at the solution of this problem. First if the number is bigger than a problem will be occured. Look at the output:


And the error now. If I enter a big number like 20 for factorial then look at this :

So what's the solution :

/*
Name   : C source program
Author : Funny Coder(Maniruzzman Akash)
It's a free code. You can use it anywhere
*/

#include <stdio.h>
int main()
{
    int num, total;
    unsigned long long int factorial = 1;         
    printf("\nEnter an integer: ");
    scanf("%d",&num);
    if (num < 0){
    printf("\nPlease enter a positive number ..!!\nTry Again..\n");
}else{
       for(total = 1; total <= num; total++)    
       {
          factorial *= total;              /* fac= fac*total */
       }
    printf("\nFactorial = %lu\n",factorial);
    }
    return 0;
}

And Now the output is absolutely right. See:




Here second code we've just used unsigned and long long for big integer number. Because an integer number range is 32676 or more..