while 和do...while

## 简单while语句 计算1....100的和

public class WhileDemo03 {
    
    
    public static void main(String[] args) {
    
    
        int i= 0;
        int sum = 0;
        while (i<=100){
    
    
            sum = i+sum;
            i++;
        }
        System.out.println(sum);
    }
}


## 简单do...while语句 1...100求和


public class DowhileDemo01 {
    
    
    public static void main(String[] args) {
    
    
        int i= 0;
        int sum = 0;
        do {
    
    
            sum = i+sum;
            i++;
        }while(i<=100);

            System.out.println(sum);
        }
    }
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