Find power of without math functions in C++/Cpp

#include<iostream>
using namespace std;

void integerPower(int base, int exp, int &res){
	res = 1;
	for(int n = 0; exp > n; n ++)
		res *= base;
}

int main(){
	int expo = 5, res;
	for(int base = 2; 5 > base; base ++){
		integerPower(base, expo, res);
		cout << base << " to power of " << expo << " is " << res << endl;
	}
	return 0;
}

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