06、While循环讲解

While题目一

package com.wzt.www.struct;

/**
 * @author WZT
 * @create 2021-03-24 21:04
 */
public class WhileDemo01 {
    
    
    public static void main(String[] args) {
    
    

        //输出0-100
        int i = 0;
        while (i<100){
    
    //注意i<=100是错误的
            i++;
            System.out.println(i);
        }
    }
}

输出

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

Process finished with exit code 0

While题目二

package com.wzt.www.struct;

/**
 * @author WZT
 * @create 2021-03-24 21:08
 */
public class WhileDemo02 {
    
    
    public static void main(String[] args) {
    
    
        //计算1+2+3...+100=?
        int i = 0;
        int sum = 0;
        while (i<100){
    
    
            i++;
            sum = i +sum;
        }
        System.out.println(sum);
    }
}

输出

5050

Process finished with exit code 0