2.4重学C++之【for循环、案例】

#include<iostream>
using namespace std;


int main(){
    //2 循环结构
    //2-3 for(起始表达式0;条件表达式1;末尾循环体2){循环语句3}
    //起始表达式仅执行1次;执行顺序:0 123 123 123 ...
    for(int i=0; i<10; i++){
        cout << i << endl;
    }
    cout << "\n" << endl;

    int a=0;
    for(; a<10; a++){
        cout << a << endl;
    }
    cout << "\n" << endl;

    int b=0;
    for(; ; b++){
        if(b >= 10){
            break;
        }
        cout << b << endl;
    }
    cout << "\n" << endl;

    int c=0;
    for(; ; ){
        if(c >= 10){
            break;
        }
        cout << c << endl;
        c++;
    }
    cout << "\n" << endl;


    //案例-敲7:1~100中含有7或7的倍数
    //7的倍数(7 14 21 28 ,,)%7=0
    //个位含7(7 17 27 37 ,,)%10=7
    //十位含7(70 71 72 73 ,,)/10=7
    for (int i=1; i<=100; i++){
        if ((i%7==0) || (i%10==7) || (i/10==7)){
            cout << "敲。。。" << endl;
        }else{
            cout << i << endl;
        }
    }



    return 0;
}

 

posted @ 2021-03-10 13:30  yub4by  阅读(83)  评论(0编辑  收藏  举报