2.5重学C++之【嵌套循环、跳转语句break】

#include<iostream>
using namespace std;


int main(){
    //2 循环结构
    //2-4 嵌套循环
    for (int i=0; i<10; i++){
        for (int j=0; j<10; j++){
        cout << "* ";  //此处不要<< endl，不然**间会换行
        }
        cout << endl;  //即为换行
    }


    //案例-乘法口诀表
    //列数*行数
    //每一行：列数=当前行数 --> 列数<=当前行数
    for (int i=1; i<=9; i++){
        //cout << i << endl;
        //for (int j=1; j<=9; j++){
        for (int j=1; j<=i; j++){
            //cout << j;
            cout << j << "*" << i << "=" << i*j << "  ";
        }
        cout << endl;
    }


    //3 跳转语句
    //3-1 break
    //(1)在switch条件语句中，终止case并跳出switch
    //(2)循环语句中，跳出当前循环不再执行
    //(3)嵌套循环中，跳出最近的内层循环
    //示例1
    cout << "请选择副本难度" << endl;
    cout << "1普通" << endl;
    cout << "2中等" << endl;
    cout << "3困难" << endl;
    int select = 0;
    //cin >> select;
    switch (select){
    case 1:
        cout << "进入普通难度副本。。。" << endl;
        break;
    case 2:
         cout << "进入中等难度副本。。。" << endl;
        break;
    default:
         cout << "进入困难副本。。。" << endl;
         break;
    }
    //示例2
    for (int i=1; i<10; i++){
        if (i==5){
            break;
        }
        cout << i << endl;
    }
    //示例3
    for (int i=0; i<10; i++){
        for (int j=0; j<10; j++){
            if (j==5){  //10*5的"*"矩阵
                break;
            }
            cout << "*";
        }
        cout << endl;
    }



    return 0;
}