Raising a number to a power in Java

^ in java does not mean to raise to a power. It means XOR.

You can use java's Math.pow()

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And you might want to consider using double instead of int—that is:

double height;
double weight;

Note that 199/100 evaluates to 1.

we can use

Math.pow(2, 4);

this mean 2 to the power 4 (2^4)

answer = 16