題目描述
給定一個double類型的浮點數base和int類型的整數exponent。求base的exponent次方。
public class Solution {
public double Power(double base, int exponent) {
boolean isNegtive = false;
if(exponent == 0)
return 1;
if(exponent == 1)
return base;
if(exponent < 0){
isNegtive = true;
exponent *= -1;
}
double pow = Power(base*base, exponent>>1);
if((exponent & 0x1)== 1){
pow *= base;
}
return isNegtive ? 1/pow : pow;
}
}