Question

How to calculate time if we have the distance and speed (kilometers per hour) in C++

Answer 1

#include <iostream>
#include <iomanip>
#include <cmath>

int main() {
    // Initialize distance and speed
    double distance = 30; // (in km)
    double speed = 90;    // (in km/h)

    // Check to avoid division by zero
    if (speed <= 0) {
        std::cerr << "Speed must be greater than zero." << std::endl;
        return 1; // exit with error code
    }

    // Calculate time
    double tm = distance / speed;
    std::cout << "Time required: " << std::fixed << std::setprecision(2) 
              << tm << " hours" << std::endl;

    // Optional: convert to hours and minutes
    int hours = static_cast<int>(std::floor(tm));
    int minutes = static_cast<int>(std::round((tm - hours) * 60));

    std::cout << "Which is approximately " 
              << hours << " hours and " << minutes << " minutes." 
              << std::endl;
}



/*
run:

Time required: 0.33 hours
Which is approximately 0 hours and 20 minutes.

*/

 

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