c++中的结构化语句 判断语句if 分支语句switch …

#include <iostream>
using namespace std;

int main(){
    
    int numberWeek;
    cout<<"请输入一个1~7之间的整数"; 
    cin>>numberWeek;
    

    if(numberWeek==1){//写的判断条件不正确，例如：2<numberWeek<10 或10<numberWeek 判断的条件有== >= <= != > <  && || ! << >> & | ^  变量在前 x>10 2<x<10
        cout<<"今天是星期一"<<endl;
    }
    if(numberWeek==2){
        cout<<"今天是星期二"<<endl;
    }
    if(numberWeek==3){
        cout<<"今天是星期三"<<endl;
    }
    if(numberWeek==4){
        cout<<"今天是星期四"<<endl;
    }
    if(numberWeek==5){
        cout<<"今天是星期五"<<endl;
    }
    if(numberWeek==6){
        cout<<"今天是星期六"<<endl;
    }
    if(numberWeek==7){
        cout<<"今天是星期日"<<endl;
    }

    return 0;
}

#include <iostream>
using namespace std;

int main(){
    
    int numberWeek;
    cout<<"请输入一个1~7之间的整数"; 
    cin>>numberWeek;
    
    if(numberWeek==1){
        cout<<"今天是星期一"<<endl;
    }else if(numberWeek==2){
        cout<<"今天是星期二"<<endl;
    }else if(numberWeek==3){
        cout<<"今天是星期三"<<endl;
    }else if(numberWeek==4){
        cout<<"今天是星期四"<<endl;
    }else if(numberWeek==5){
        cout<<"今天是星期五"<<endl;
    }else if(numberWeek==6){
        cout<<"今天是星期六"<<endl;
    }else if(numberWeek==7){
        cout<<"今天是星期日"<<endl;
    }else{
        cout<<"您输入的数字不符合要求。"<<endl;
    }
    

    return 0;
}

#include <iostream>
using namespace std;

int main(){
    
    int monthNumber;
    cout<<"请输入一个1~12之间的整数"; 
    cin>>monthNumber;
    
    switch (monthNumber){
        case 3:
        case 4:
        case 5:
            cout<<"这是春天"<<endl;
            break;
        case 6:
            cout<<"这是夏天"<<endl;
            break;
        case 7:
        case 8:
            cout<<"这是夏天"<<endl;
            break;
        case 9:
        case 10:
        case 11:
            cout<<"这是秋天"<<endl;
            break;
        case 12:
        case 1:
        case 2:
            cout<<"这是冬天"<<endl;
            break;
        default:
             cout<<"您输入的数字不符合要求。"<<endl;
             break;
    }

    
    return 0;
}

#include <iostream>
using namespace std;

int main(){
    int x=1;
    while(x<11){//目前叫做死循环 必须要有一个不满足循环条件的时候 
        if(x%2==1)
            cout<<"x="<<x<<endl;
        x++;
    }
    return 0;
}

#include <iostream>
using namespace std;

int main(){
    int x=1;
    do{//目前叫做死循环 必须要有一个不满足循环条件的时候 
        if(x%2==1)
            cout<<"x="<<x<<endl;
        x++;
    }while(x<11);
    return 0;
}

#include <iostream>
using namespace std;

int main(){
    int x=1;
    do{
        cout<<"x="<<x<<endl;
        x++;
    }while(x<1);
    return 0;
}

#include <iostream>
using namespace std;

int main(){
    int x=1;
    while(x<1){
        cout<<"x="<<x<<endl;
        x++;
    }
    return 0;
}