循环语句For While do-while的小练习

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/**

题目2：使用 for 、while 、do-while 语句编写程序，打印 1 到 100 的和

*/

class For{public static void main(String[] args){//定义整型变量sum，用来存和并初始化为0int sum = 0;for (int x = 1; x<=100; x++){sum = sum+x;}System.out.println("For: sum = "+sum);//输出1-100的和，格式为：For: sum = sum}}

class While{public static void main(String[] args){//定义整型变量sum，用来存和并初始化为0int sum = 0;//定义整型变了x,初始化为1int x = 1;//当条件小于等于100时,执行下列循环语句while(x<=100){sum = sum+x;x++;}System.out.println("While: sum = "+sum);//输出1-100的和，格式为：While: sum = sum}}

class DoWhile{public static void main(String[] args){//定义整型变量sum，用来存和并初始化为0int sum = 0;//定义整型变了x,初始化为1int x = 1;//执行循环语句do{sum = sum + x;x++;}//判断条件while(x<=100);System.out.println("D0_While: sum = "+sum);//输出1-100的和，格式为：D0_While: sum = sum}}