Hello, i need to make program which can do squaring, so x^n. I can do it with pow(x,n):

``````#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double x, c;
int n;
cout << "Alap = "; cin >> x;
cout << "Kitevo = "; cin >> n;
if (n < 0)
{
cerr << "Csak termeszetes szam lehet a kitevo!" << endl;
return -1;
}
c = pow(x,n);
cout << "Hatvanyertek = " << c;
return 0;
}``````

But i need to do it without pow(,) and only with #include <iostream>. So i need to do x*x*...*x with n times... I think i need to use a while loop but i have no idea how. Can anybody help me? (sorry for bad English)

## All 2 Replies

what you need to use is a for(), since it is better because you can instruct the cycle to do the procedure as many times as you want. Like this:

``````double x,multiplication=1; //create a second variable so you won't lose your x value
for (int i=0;i<n;i++){
multiplication=multiplication*x; //multiply your x value to your stored multiplication in the variable you created
}
``````

or if you were using a while(), you could do it this way:

``````double x,multiplication=1,i=0; //i is your centinel to stop the cycle
while (i<n){
multiplication=multiplication*x;
i++;
}
``````

Thank you, it's working.

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