CODEWITHSUNDEEP
java
Mohamed Elkady
Mohamed Elkady

Reputation: 15

Incorrect result of power calculation when base is greater than 8

My code to get the power of any base with exponent 10 runs okay from 1 to 8: after that the result isn't correct. What did I miss? Please check if the base is 9 or 10?

public static int power(int base, int exponent){
    int powResult = 1;
    for (int i = 0; i < exponent; i++) {
        powResult = powResult * base;
    }
    return powResult;
}

public static void main(String[] args) {
    
    System.out.println("Enter your x number: ");
    Scanner input = new Scanner(System.in);
    int x = input.nextInt();
    
    int v1 = power(x, 10);
    
    int result = v1;
    
    System.out.println("your input : "+ x);
    System.out.print("your result : "+ result);
Input Expected output Printed output
7 282475249 282475249
8 1073741824 1073741824
9 3486784401 -808182895
10 10000000000 1410065408

Upvotes: 0

Views: 88

Answers (2)

Nicolas Villacorta
Nicolas Villacorta

Reputation: 341

Remember that the datatype 'int' just can contain values between -2,147,483,648 and 2,147,483,647. So when you assign to the int type 'powResult' a higher value it breaks. Try to define your powResult as a long.

Upvotes: 1

spartygw
spartygw

Reputation: 3462

Your problem is that you are using int which my guess is represented internally as a signed 2^32 value. So in effect the largest value it can represent is 2147483648

9^10 is 3486784401

Upvotes: 1

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