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Program to find the power of a number without using inbuilt function.

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import java.io.*;

class PowerOfANumber
{
    public static void main(String [] args){
        int x=5,y=5;
        System.out.println(power(x,y));
    }

    public static int power(int x , int y){
        if(y==0)
            return 1;
        else if(y%2==0)
            return power(x,y/2)*power(x,y/2);
        else
            return x*power(x,y/2)*power(x,y/2);
    }
}

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