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Modified main.c file of Factorial_using_recursion #21

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Modified main.c file of Factorial_using_recursion #21

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23 changes: 15 additions & 8 deletions 001_RECURSION/007_Factorial_using_recursion/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,26 +3,33 @@

int factorial(int n)
{
if(n>1)
if(n == 0 || n == 1)
{
return n * factorial(n-1);
return 1;
}
else if (n>=0)
else if (n>1)
{
return 1;
return n * factorial(n-1);
}
else
{
exit(-1);
return -1;
}
}

int main()
{
int n;
printf("Enter a non-negative number : ");
scanf("%d", &n);

printf("Factorial of %d is : %d", n, factorial(n));
if(factorial(n) == -1)
{
printf("%d is a negative number. Factorial doesn't exist for a negative number!\n", n);
}
else
{
printf("Factorial of %d is : %d", n, factorial(n));
}

return 0;
}
}