How Factorial is Calculated?
Factorial is simply defined as “the product of an integer (n) and all the integers below it. For Example- Factorial three ( 3! ) is equal to 6
Factorial of a number ‘N’ is represented as N!
N! is calculated as N*(N-1)*(N-2)*(N-3)……*1
Let the Value of N is 5 then Factorial of N is 5*4*3*2*1=120
C Program for Factorial of a Number:
int n, i;
unsigned long long fact = 1;
printf(“Enter a number to Find its Factorial: “);
if (n < 0)
printf(“Error! Factorial of a negative number doesn’t exist”);
for(i=1; i<=n; i++)
fact = fact * i;
printf(“Factorial of %d = %llu”, n, fact);
Enter a number to Find its Factorial: 6
Factorial of 6 = 720
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