c++ cstring 常用函數

#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;
    //按照字典順序比較字符串，從左到右比較，字母靠前的小
    cout<<"比較a,b: "<<strcmp(a,b)<<endl<<"比較a,c: "<<strcmp(a, c)<<endl;
    cout<<"把b復制到a"<<endl;
    strcpy(a, b);
    cout<<"a: "<<a<<"\nb: "<<b<<endl;
    cout<<"把b的一部分復制到a"<<endl;
    strcpy(a, &b[5]);
    cout<<"a: "<<a<<"\nb: "<<b<<endl;
    strcpy(a, c);
    cout<<"字符串連接"<<endl;
    strcat(a, b);
    cout<<"a+b: "<<a<<endl;
    //這里需要注意的是，如果連接后的長度大於a[]的長度， 運行會出現問題， 所以確保a的長度足夠長
return 0;}