raising to a power

Does anyone know of a way to raise a constant to a variable.
Ex. 15 raised to the (xy)
Im kinda new to this so any help would be much appreciated.

Code:

---

#include <cmath>
#include <iostream>

int main(){
    int xy = 2;
    int x = pow(3, 4);  //this means 3 to the fourth
    int y = pow(15, xy); //15 to the xy
    return 0;
}

---

Within reason, you can also unroll the multiplications.

Code:

---

int x, y;
x = pow(15, 3);  //this works
y = 15*15*15;  //this is faster

---

Of course with variable exponents you will need to use the pow() functions.

wll if you want to write a function then this is how it works

Code:

---


power(x,y)
{

double temp=1;
for(int i=0;i<y+1;i++)
{

temp=temp*x;

}

return temp;
}

---

>y = 15*15*15; //this is faster

Maybe, but what about:

3^25

or

7^2.6

2^3 doesn't work with me!
Maybe I need to overload it.