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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 663 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%2==0; i++){   				s += i;		}		System.out.println(s);	}}运行结果输出为0

原因分析:

for循环,只有满足了判断条件才会进入i++循环,一旦不满足就会跳出循环。

这里的判断语句是i<101 && i%2==0,当i=1时条件不满足,跳出循环,输出s=0,无法实现累加

修改代码:

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);	}}

附:用while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 = s + i;			}			i++;		}		System.out.println(s);	}}

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