2018/12/04 PAT刷题 L1-012 计算指数 java

这题很简单, 就是for循环的事:

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int num = Integer.parseInt(br.readLine());
        int sum = 1;
        for (int i=0; i<num; i++) {
            sum*=2;
        }
        System.out.println("2^"+num+" = "+sum);
    }
}