Input and Output in C++ hackerrank solution

      
  #include <iostream>
  using namespace std;
  
  int main() {
      // Declare variables
      int a, b;
      
      // Read input
      cin >> a >> b;
      
      // Perform computation
      int sum = a + b;
      
      // Output the result
      cout << "Sum: " << sum << endl;
      
      return 0;
  }
  

Let's break down the code and explain each part:

#include : This preprocessor directive includes the necessary input/output stream library for C++.

using namespace std;: This statement allows us to use the standard library functions without explicitly specifying the namespace (e.g., cout, cin).

int main(): This is the main function of the program. It is the entry point for execution.

int a, b;: We declare two integer variables, a and b, which will hold the user's input.

cin >> a >> b;: This statement reads two integers from the user and assigns them to the variables a and b. The >> operator is used for input.

int sum = a + b;: Here, we compute the sum of a and b and store the result in the variable sum.

cout << "Sum: " << sum << endl;: This line outputs the result to the console. The << operator is used to insert values into the output stream. We print the string "Sum: ", followed by the value of sum. endl is used to insert a new line character into the output stream.

return 0;: This line indicates that the program execution is successful and returns the value 0 to the operating system.

When you run this program, it will prompt the user to enter two integers. After the user enters the values, the program will compute their sum and display it as output.

To use this code in HackerRank, you can copy and paste it into the editor and submit it. The program will prompt the user for input, and the output will be displayed in the output window or terminal, depending on the HackerRank environment.

Remember to include the necessary header file (#include ) and use the correct function signature (int main()) as shown in the example above.