C++ 学习

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简单程序设计

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#include <iostream>
using namespace std; // 针对命令空间的指令
int main() {
    // insert code here...
    cout << "Hello, World!\n"<<endl; //endl 表示换行符
    cout << "Welcome to C++ 1"<<endl;
    return 0;
}
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// if 实现选择语句
#include <iostream>
using namespace std;
int main() {
    int year;
    bool isLeapYear;
    
    cout<<"Enter the year: ";
    cin>>year; //将提取符作用在流类对象cin上，键盘输入
    isLeapYear = ((year%4 == 0 && year%100!=0) || (year%400 == 0));
    
    if (isLeapYear)
        cout<<year<<" is a leap year"<<endl; // endl 插入换行符，并刷新流
    else
        cout<<year<<" is not a leap year"<<endl;
    
    return 0;
}
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// 嵌套的if语句

#include <iostream>
using namespace std;

int main() {
    int x, y;
    cout<<"Enter x and y:";
    cin>>x>>y;
    
    if (x!=y)
        if (x>y)
            cout<<"x>y"<<endl;
        else
            cout<<"x<y"<<endl;
    else
        cout<<"x=y"<<endl;
    return 0;
}