For Loop in C++ hackerrank solution

      
  #include <iostream>
  using namespace std;
  
  int main() {
      int a, b;
      cin >> a >> b;
      
      for (int num = a; num <= b; num++) {
          if (num == 1) {
              cout << "one" << endl;
          } else if (num == 2) {
              cout << "two" << endl;
          } else if (num == 3) {
              cout << "three" << endl;
          } else if (num == 4) {
              cout << "four" << endl;
          } else if (num == 5) {
              cout << "five" << endl;
          } else if (num == 6) {
              cout << "six" << endl;
          } else if (num == 7) {
              cout << "seven" << endl;
          } else if (num == 8) {
              cout << "eight" << endl;
          } else if (num == 9) {
              cout << "nine" << endl;
          } else {
              if (num % 2 == 0) {
                  cout << "even" << endl;
              } else {
                  cout << "odd" << 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 variables a and b to store the input values.

cin >> a >> b;: This statement reads two input values from the user and assigns them to the variables a and b using the >> operator.

for (int num = a; num <= b; num++) { ... }: This is a for loop. It initializes the loop variable num with the value of a, executes the loop body as long as num is less than or equal to b, and increments num by 1 after each iteration.

Inside the for loop, there are several if and else if statements that check the value of num. If num is equal to 1, 2, 3, 4, 5, 6, 7, 8, or 9, it outputs the corresponding string using cout. Otherwise, it checks if num is even or odd using the modulus operator % and outputs "even" or "odd" accordingly.

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 values (a and b). It will then iterate from a to b, inclusive, and output the corresponding strings or even/odd based on the conditions.

To use this code in HackerRank's "For Loop" problem, 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.

Make sure to read the problem statement and input/output requirements carefully and adjust the code accordingly if needed.