1523. Count Odd Numbers in an Interval Range solution in c++

Here is a solution in C++ to count the number of odd numbers in an interval range. I will provide explanations for each step of the code.

#include <iostream>

int countOddNumbers(int start, int end) {
    int count = 0; // Initialize a counter variable to keep track of the number of odd numbers

    for (int i = start; i <= end; i++) { // Iterate through each number in the given interval range
        if (i % 2 != 0) { // Check if the number is odd
            count++; // Increment the counter if the number is odd
        }
    }

    return count; // Return the final count of odd numbers
}

int main() {
    int start, end;

    std::cout << "Enter the start of the interval range: ";
    std::cin >> start; // Read the start of the interval range from the user

    std::cout << "Enter the end of the interval range: ";
    std::cin >> end; // Read the end of the interval range from the user

    int oddCount = countOddNumbers(start, end); // Call the countOddNumbers function to count the odd numbers

    std::cout << "The number of odd numbers in the interval range is: " << oddCount << std::endl; // Print the result

    return 0;
}

Explanation of each step:

1. The code starts by including the necessary header file iostream, which provides input and output stream classes in C++.

2. The countOddNumbers function is defined with two parameters start and end representing the start and end of the interval range.

3. Inside the countOddNumbers function, an integer variable count is initialized to 0. This variable will be used to keep track of the number of odd numbers in the range.

4. A for loop is used to iterate through each number in the given interval range. The loop starts at the start value and continues until it reaches the end value.

5. Inside the loop, an if statement is used to check if the current number i is odd. This is done by checking if the remainder of i divided by 2 is not equal to 0.

6. If the number is odd, the count variable is incremented by 1.

7. After the loop finishes, the final count of odd numbers is returned from the countOddNumbers function.

8. In the main function, integer variables start and end are declared.

9. The user is prompted to enter the start and end of the interval range using std::cout and std::cin statements.

10. The countOddNumbers function is called with the start and end values as arguments, and the returned count is stored in the oddCount variable.

11. Finally, the result is printed to the console using std::cout << statement, along with the value of oddCount. The std::endl statement is used to insert a newline character.

12. The program ends by returning 0 from the main function, indicating successful execution.