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First of all we will define what factorial is and how to it is calculated.
Factional is non negative integer. Notation would be n! It is calculated by multiplying all integers from 1 to n;
For example:
5! = 1 x 2 x 3 x 4 x 5 = 120.
Note: 0! = 1
Small C program that illustrates how factorial might be counted:
#include
int factorial(int num);
int main() {
int num;
printf("Enter number: ");
scanf("%d", &num);
printf("Factorial: %d\n", factorial(num));
return 0;
}
int factorial(int num) {
if (num == 0) {
return 1;
}
return num * factorial(num - 1);
}
Testing:
Enter number: 5
Factorial: 120
Enter number: 0
Factorial: 1
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