用while循環計算1+2+3+...+100=？

package Struct;

public class WhileDemo03 {
    public static void main(String[] args) {
        //計算1+2+3+...+100

        int i = 0;
        int sum = 0;

        while(i <= 100){
            sum = sum + i;
            i++;
        }

        System.out.println(sum);
    }

}

運行結果