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C++循环嵌套学习笔记

  • 2026-03-24 21:12:39
C++循环嵌套学习笔记

1. 什么是循环嵌套?

循环嵌套,就是在一个循环的循环体内,又包含了另一个完整的循环结构。例如for循环的里面可以套for循环,for循环的里面也可以套用while循环,while循环的里面可以套用while循环,while循环的里面同样可以套用for循环。

可以理解为:

  • 外层循环控制“第几轮

  • 内层循环负责“每一轮做什么

就像钟表:时针(外层)转一圈,分针(内层)转60圈

2. 循环嵌套的基本结构

2.1 语法格式(常用)

for(int i = 1; i <= n; i++) // 外层循环    // 外层循环的代码    for(int j = 1; j <= m; j++) // 内层循环    {            // 内层循环的代码    }    // 外层循环的后续代码}

执行流程:

  1. 外层循环变量i = 1

  2. 执行内层循环( j从1到m,完整执行一遍)

  3. 外层循环i++,i = 2

  4. 再次完整执行内层循环

  5. 重复直到外层循环结束

记住:内层循环跑完一遍,外层才走一步。

for (int i = 1; i <= 3; i++) {    cout << "i=" << i << " 开始" << endl;    for (int j = 1; j <= 3; j++)     {        cout << "  j=" << j << endl;    }    cout << "i=" << i << " 结束" << endl;}

输出:

i=1 开始  j=1  j=2  j=3i=1 结束i=2 开始  j=1  j=2  j=3i=2 结束i=3 开始  j=1  j=2  j=3i=3 结束

理解了吗? 内层循环的j从1跑到3,外层i才增加1。相当于外层i执行了一次,内层的循环执行了3次,直到内层结束,再去执行外层的下一次操作。

2.2 最简单的例子:打印矩形

#include<bits/stdc++.h>using namespace std;intmain(){    // 打印一个5行×10列的矩形,用*表示    for(int i = 1; i <= 5; i++)// 外层:控制行数    {                for (int j = 1; j <= 10; j++) // 内层:控制每行的*个数	{   	    cout << "*";	}	cout << endl;// 每行结束换行     }     return 0;}
输出:
**************************************************

理解:

  • 外层循环i从1到5,共执行5次

  • 每次外层循环,内层循环j从1到10,输出10个*

  • 内层循环结束后,输出换行

2.3 进阶例子:判断完数
#include<bits/stdc++.h>using namespace std;/*   完数:一个数如果恰好等于它的因子之和(不包含自己)  编程序找出[1, n]的所有完数, 分行进行输出*/intmain(){    int n;    cin >> n;    for(int i = 1; i <= n; i++)//需要用循环实现1~n的遍历     {        int sum = 0;//每次 对应一个新的i, sum都要进行清空操作         //如何判断i是完数        for(int j = 1; j <= i-1; j++)//在这个范围里找因数         {            if(i % j == 0)//找到能够被i整除的j 就说明j是i的因数             {                sum += j;//把j都加到sum中             }        }        if(i == sum) //本身 == 因数和         {            cout << i << endl;         }    }    return 0;}

3、初学者必记的2条规则

规则1:变量名要不同

// 正确for(int i = 1; i <= 5; i++) {    for (int j = 1; j <= 5; j++)     {        // 外层用i,内层用j    }}// 错误for(int i = 1; i <= 5; i++) {    for (int i = 1; i <= 5; i++)     {          // 都用i,冲突了!    }}

规则2:换行要放对位置

//正确for(int i = 1; i <= 5; i++) {    for(int j = 1; j <= 5; j++)     {        cout << "*";      // 内层:打印*    }    cout << endl;          // 外层:换行(打满一行再换行)}//错误for(int i = 1; i <= 5; i++) {    for(int j = 1; j <= 5; j++)     {        cout << "*";        cout << endl;      // 每打一个*就换行,错了!    }}

4、内容总结

  • 矩形:内层循环次数固定

  • 三角形:内层循环次数 = 外层变量

  • 外层管“第几轮”

  • 内层管“每轮做什么”

  • 换行在内层结束后

  • 变量内外要分清

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  1. CONNECT:[ UseTime:0.001122s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001656s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000689s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000676s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001392s ]
  6. SELECT * FROM `set` [ RunTime:0.000604s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001585s ]
  8. SELECT * FROM `article` WHERE `id` = 477271 LIMIT 1 [ RunTime:0.006732s ]
  9. UPDATE `article` SET `lasttime` = 1774388657 WHERE `id` = 477271 [ RunTime:0.007996s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.006750s ]
  11. SELECT * FROM `article` WHERE `id` < 477271 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001246s ]
  12. SELECT * FROM `article` WHERE `id` > 477271 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010228s ]
  13. SELECT * FROM `article` WHERE `id` < 477271 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004770s ]
  14. SELECT * FROM `article` WHERE `id` < 477271 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003325s ]
  15. SELECT * FROM `article` WHERE `id` < 477271 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006327s ]
0.219448s