learn_cpp/比较运算符.cpp

//
// Created by violet on 2026/2/28.
//
#include "cstring"

#include "iostream"
using namespace std;
int main() {
    //==相等 !=不等 >大于 <小于 <=小于等于>=大于等于
    int num1 =3;
    int num2 =4;
    bool r1 = (num1!=num2);
    cout<<r1<<endl;
    //字符串要用strcmp比较，否则只能比较内存地址
    char s1[]="hello";
    char *s2 = "hello";
    cout<<(strcmp(s1,s2))<<endl;
    char s3[] = "a";
    char *s4 = "b";
    cout<<(strcmp(s4,s3))<<endl;

    cout<<"字面量字符串"<<strcmp("a","b")<<endl;
    //只要有一个c++风格的字符串，就可以用比较运算符来比较，比较他们的值而不是内存地址
    string s5 = "a";//c++风格字符串
    string s6 = "a";
    cout<<(s5== s6)<<endl;
    cout<<(1==1 && 2==2)<<endl;
    cout<<(1==2 && 2==2)<<endl;
    cout<<(1==2 || 2==3)<<endl;
    cout<<(1==2 || 2==2)<<endl;
    bool s123 = 100;
    cout<<(s123)<<endl;
    return 0;
}