Question

I have just started reading a C++ textbook and I am having trouble solving one of the coding problems at the end of the chapter. Here is the question:

Write a program that asks the user to enter an hour value and a minute value. The
main() function should then pass these two values to a type void function that displays
the two values in the format shown in the following sample run:

Enter the number of hours: 9
Enter the number of minutes: 28
Time: 9:28

my code so far is:

#include <iostream>
using namespace std;
void time(int h, int m);

int main()
{
    int hour, min;

    cout << "enter the number of hours: ";
    cin >> hour;
    cout << "enter the number of minutes: ";
    cin >> min;

    string temp = time(hour, min);

    cout << temp;

    return 0;
}

void time(int h, int m)
{
    string clock;
    clock =
}

What do I do now inside the time(n, m) function?

Thanks.

Answer 1

You can include <iomanip> and set field width and fill so that times like 9:01 are printed properly. And since the function time should just print the time, building and returning a std::string can be omitted. Just print these values:

void time(int hour, int min)
{
    using namespace std;
    cout << "Time: " << hour << ':' << setfill('0') << setw (2) << min << endl;
}

Also note that writing using namespace std; at the beginning of your files is considered bad practice since it causes some of user-defined names (of types, functions, etc.) to become ambiguous. If you want to avoid exhausting prefixing with std::, use using namespace std; within small scopes so that other functions and other files are not affected.