How do you get the factorial of a number with just addition and subtraction ? lets say i have to find 5!

Question

anonymous · Answer

just define multiplication in terms of addition (and a loop)

anonymous · Answer

and you're probably meant to learn and use the principles of recursion (in which case you don't even need the loop).

anonymous · Answer

What language are you using?
I do Python, so I can explain it using that. 
Have two variables x and y. y is x - 1
Multiply x and y together, and that is your new variable for x.
Subtract one from y, and that is now y.
Do all this while the variable for y is greater than 0, or greater than or equal to 1.

anonymous · Answer

you multiplied

anonymous · Answer

thank u all i fix it

anonymous · Answer

so how much faster is this (meant to be) than just letting the compiler do the work on
int fact(int a)
{
    if (a<3) return a;
    return a*fact(a-1);
}
?

Also, could you close the question at some point?