The factorial of an integre Nis the product of the integers between 1 and N. inclusive. Write a while loop that competes the futurial of a given interer N.

Answer 1

I'm going to write this in C/C++, because that's how I am.

Given an int (integer) value N, we want to find the product of all values 1..N (inclusive). We can do this, simply, by doing it 'backwards' from N..1, like so:

int N = ...;

.

.

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int factorial = 1;

while (N > 0) {

factorial = factorial * N;

N = N - 1;

}

Actually, in C/C++ we can write the loop even more concisely:

while (N > 0) {

factorial *= N--;

}