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pow.cpp
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pow.cpp
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/*
* A simple divide and conquer approach to calculate pow(x,y)
*/
#include <iostream>
double pow( double x, int y )
{
//base case
if ( y == 0 ) {
return 1;
}
double temp = pow(x, y/2);
if ( y % 2 == 0 ) {
return temp * temp;
} else {
if ( y > 0 ) {
return x * temp * temp;
} else {
return ( temp * temp ) / x;
}
}
}
int main()
{
std::cout << "Program to calculate power y to the base x\n";
double x;
int y;
std::cout << "Enter base : ";
std::cin >> x;
std::cout << "Enter power(int + or -) : ";
std::cin >> y;
std::cout << "Power " << y << " to the base " << x << " is: ";
std::cout << pow(x, y) << std::endl;
return 0;
}