#include<bits/stdc++.h>

#include <bits/stdc++.h>
using namespace std;

int main() {
    // Declare variables
    int a = 5;
    int b = 10;
    int sum;

    // Add 'a' and 'b' and store the result in 'sum'
    sum = a + b;

    // Output the result
    cout << "The sum of a and b is: " << sum << endl;

    return 0;
}

Explanation: - #include <bits/stdc++.h>: Includes a library that contains commonly used libraries in competitive programming and isn't part of the standard C++ libraries. - using namespace std;: Allows using elements from the standard C++ library without specifying the namespace. - int main() { ... }: Entry point of the program. Execution begins from here. - int a = 5; and int b = 10;: Declaration and initialization of integer variables 'a' and 'b'. - int sum;: Declaration of an integer variable 'sum'. - sum = a + b;: Adds the values of 'a' and 'b' and stores the result in the 'sum' variable. - cout << "The sum of a and b is: " << sum << endl;: Outputs the sum of 'a' and 'b' to the console. - return 0;: Indicates successful termination of the program.