Question

C++ question. Please explain the code and how it resulted in the output. Explain each line along with the aspects of "buffers" if possible. Everything is listed below.

Code below:

#include <iostream>
#include <string>

using namespace std;

int main() {

   cout << boolalpha;
   cout << static_cast<bool>(1) << endl;
   cout << static_cast<bool>(0) << endl;

   string s = "AAARGH!!!";

   if (s.find("AAA")) { cout << 1 << endl; }
   if (s.find("RGH")) { cout << 2 << endl; }
   if (s.find("???")) { cout << 3 << endl; }
  
       return 0;
}

Output:

true

false

2

3

Answer 1

If you have any problem with the code feel free to comment.

Program with Explanation

#include <iostream>
#include <string>

using namespace std;

int main()
{
//setting the boolapha value so that it will show true and false
//instead of 0 and 1
cout << boolalpha;
//showing textual boolean value
cout << static_cast<bool>(1) << endl;
cout << static_cast<bool>(0) << endl;

string s = "AAARGH!!!";

//since AAA is found at 0 position and in C++ 0 means false in boolean
//so this if statements return false
if (s.find("AAA"))
{
cout << 1 << endl;
}

//This value is found at position 3 and any value above 0 is true
//so this if statements returns true and display the output
if (s.find("RGH"))
{
cout << 2 << endl;
}
  
//This is not found in the given string and returns a garbage value
//since the value is greater than 0 so this if statement also returns true
if (s.find("???"))
{
cout << 3 << endl;
}

return 0;
}