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java的for循环语句,没有实现循环的原因分析
阅读量:502 次
发布时间:2019-03-07

本文共 807 字,大约阅读时间需要 2 分钟。

用for循环实现1-100中偶数的累加

public class ControlWord{
public static void main(String[] args){
int s = 0; for(int i=1; i<101; i++){ if(i%2==0) s += i; } System.out.println(s);

原因分析:

当前的循环条件有问题。for循环的条件判断需要满足i<101 && i%2==0才能继续循环。一旦i=1时,条件不满足,循环立即跳出,导致s的值仍为0。

修复代码

public class ControlWord{        public static void main(String[] args){            int s = 0;            for(int i=1; i<101; i++){                if(i%2==0)                    s += i;            }            System.out.println(s);        }    }

使用while循环实现累加

public class ControlWord{        public static void main(String[] args){            int s = 0;            int i=0;            while(i<=100){                if(i%2==0){                    s += i;                }                i++;            }            System.out.println(s);        }    }

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