C++ program code:

//header section
#include <iostream>
using namespace std;
// 1 Function to read the length in feet and inches from the user
void readLength(int& feet, int& inches)
{
    cout << "Enter the length in feet: ";
    cin >> feet;
    cout << "Enter the length in inches: ";
    cin >> inches;
}

//2  Function to convert length from feet and inches to meters and centimeters
void convertToMetersAndCentimeters(int feet, int inches, double& meters, int& centimeters) 
{
    double totalInches = feet * 12 + inches;
    meters = totalInches * 0.0254; // 1 inch is equal to 0.0254 meters
    centimeters = static_cast<int>((meters - static_cast<int>(meters)) * 100);
}

//3 Function to output the equivalent length in meters and centimeters
void outputLength(int feet, int inches, double meters, int centimeters)
{
    cout << feet << " feet and " << inches << " inches is equivalent to ";
    cout << meters << " meters and " << centimeters << " centimeters." << endl;
}
//main method
int main() 
{
    //declare variable
    char repeat;
    //uses a do-while loop to allow the user to repeat the computation
    //for new input values until they choose to end the program 
    //by entering 'n' or 'N' when prompted.
    do 
    {
        int feet, inches;
        double meters;
        int centimeters;

        // Read length in feet and inches from the user
        readLength(feet, inches);

        // Convert length to meters and centimeters
        convertToMetersAndCentimeters(feet, inches, meters, centimeters);

        // Output the equivalent length in meters and centimeters
        outputLength(feet, inches, meters, centimeters);

        // Ask if the user wants to repeat the computation
        cout << "Do you want to enter another length? (y/n): ";
        cin >> repeat;

    } while (repeat == 'y' || repeat == 'Y');

    return 0;
}

Output of the program code:

Enter the length in feet: 400
Enter the length in inches: 40
400 feet and 40 inches is equivalent to 122.936 meters and 93 centimeters.
Do you want to enter another length? (y/n): y
Enter the length in feet: 50
Enter the length in inches: 1000
50 feet and 1000 inches is equivalent to 40.64 meters and 64 centimeters.
Do you want to enter another length? (y/n): n