c++ cstring 常用函数

#include<iostream>
#include<cstring>
using namespace std;
int main(){
    char a[30] = "LaiXingYu", b[] = "LiuPeiWen", c[] = "LaiXingYu";
    cout<<"a: "<<a<<endl<<"b: "<<b<<"\nc: "<<c<<endl;
    //按照字典顺序比较字符串，从左到右比较，字母靠前的小
    cout<<"比较a,b: "<<strcmp(a,b)<<endl<<"比较a,c: "<<strcmp(a, c)<<endl;
    cout<<"把b复制到a"<<endl;
    strcpy(a, b);
    cout<<"a: "<<a<<"\nb: "<<b<<endl;
    cout<<"把b的一部分复制到a"<<endl;
    strcpy(a, &b[5]);
    cout<<"a: "<<a<<"\nb: "<<b<<endl;
    strcpy(a, c);
    cout<<"字符串连接"<<endl;
    strcat(a, b);
    cout<<"a+b: "<<a<<endl;
    //这里需要注意的是，如果连接后的长度大于a[]的长度， 运行会出现问题， 所以确保a的长度足够长
return 0;}