Java循环语句中的sum=sum+num;改为sum+=num;其他代码还有格式和答案一样,结果还是56,这是为什么呢?

public class HelloWorld {

    public static void main(String[] args) {

        

int sum = 0; // 保存 1-50 之间偶数的和

        

int num = 2; // 代表 1-50 之间的偶数

        

do {

//实现累加求和

            sum+=num;

         num = num + 2; // 每执行一次将数值加2,以进行下次循环条件判断

            

} while (  sum<=50  ); // 满足数值在 1-50 之间时重复执行循环

        

System.out.println(" 50以内的偶数之和为:" + sum );

}

}


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3回答

慕瓜9220888

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qq_一分一分_0

是num<50吧。?

qq_皮卡_2

你好,嗯,我刚开始是写sum+=num的,但结果是56,不是答案650,但其他的都一样

yanrun

sum += num和sum = sum + num是等价的,只不过前者是后者的一种简写方式
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