A question that makes errors common to advanced C ++ programmers

I have seen it in a forum before. It has been too long and I don't quite remember it. Today I turned it out and found it quite classic. I posted it. As follows:

This is a typical problem that many people may encounter. This is also a problem that is frequently encountered in C ++ input.

The C ++ code is as follows:

#include <iostream>   3.int main()   4.{   5.    using namespace std;   6.    const int ArSize = 20;   7.    char name[ArSize];   8.    char dessert[ArSize];   9.  10.    cout << "Enter your name:\n";   11.    cin >> name;   12.    cout << "Enter your favorite dessert:\n";   13.    cin >> dessert;   14.    cout << "I have some delicious " << dessert;   15.    cout << " for you, " << name << ".\n";   16.    return 0;    17.}   

You can ignore the answer and think about the running result of this program. If you are correct, it means that your c ++ learning is still better ....

The answer is as follows:

Let's take a look at the differences between the following code and the above Code:

1.// instr2.cpp -- reading more than one word with getline   2.#include <iostream>   3.int main()   4.{   5.    using namespace std;   6.    const int ArSize = 20;   7.    char name[ArSize];   8.    char dessert[ArSize];   9.  10.    cout << "Enter your name:\n";   11.    cin.getline(name, ArSize);  // reads through newline   12.    cout << "Enter your favorite dessert:\n";   13.    cin.getline(dessert, ArSize);   14.    cout << "I have some delicious " << dessert;   15.    cout << " for you, " << name << ".\n";   16.    return 0;    17.}  

If you see the problem, the key is this cin. It does not determine the length of the Cross-border. This is similar to scanf. Therefore, you must specify the length of the input when entering the data, to prevent cross-border attacks.