C++Primer Plus中指针与字符串例程VS2017版

#include "pch.h"
#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <cstring>
//#include <climits>
using namespace std;

int main() {
    char animal[20] = "bear";
    const char* bird = "wren";
    char* ps;
    cout << animal << " and ";
    cout << bird << '
';
    cout << "Enter a kind of animal: ";
    cin >> animal;
    ps = animal;
    cout << ps << "!
";
    cout << "Before using strcpy():
";
    cout << animal << " at " << (int *)animal << endl;
    cout << ps << " at " << (int*)ps << endl;
    ps = new char[strlen(animal) + 1];
    strcpy_s(ps, strlen(animal) + 1,animal);
    cout << "After using strcpy():
";
    cout << animal << " at " << (int*)animal << endl;
    cout << ps << " at " << (int*)ps << endl;
    delete [] ps;
    return 0;
}

书籍中给出的源码在VS2017环境下编译会报错，因为VS2017需要使用strcpy()的安全版本strcpy_s()，然而当我们直接替换时，编译器仍然会报错，这是因为strcpy_s()中的参数与strcpy并不完全相同，需要保证缓冲区，直接new的话仍然会报错，需要在strcpy_s()中第二个参数加入被cpy参数的长度。修改完成再编译即可通过。