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Add given timestamps by overloading + operator in C++ Time Class

  • Difficulty Level : Hard
  • Last Updated : 30 Aug, 2021
  • In C++, we can make operators to work for user-defined classes. This means C++ has the ability to provide the operators with a special meaning for a data type, this ability is known as operator overloading.
  • In this article, we will overload an operator ‘+’ in the Time class so that we can concatenate two timestamps by just using +.

Example: 

Input: T1 = 5:50:30, T2 = 7:20:34 
Output: 13:11:4 
 

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Approach: To achieve the + operator overloading, below steps/functions are made:

Class Time is defined in which there are 3 variables to store the value of hours, minutes and seconds respectively.



int HR, MIN, SEC;
where HR is for hours, 
      MIN is for minutes, and 
      SEC is for seconds
  • setTime() function to set values of HR, MIN and SEC.
void setTime(int x, int y, int z)
{
    x = HR;
    y = MIN;
    z = SEC;
}
  • showTime() function to display the time in a specific format (HH:MM:SS).
void showTime()
{
    cout << HR << ":" << MIN << ":" << SEC;
}
  • normalize() function to convert the resultant time into standard form.

Overloading of + operator to add time T1 and T2 using operator overloading.

Below is the C++ program implementing + overloading to add two timestamps:

C++




// C++ program to implement + operator
// overloading to add two timestamps
 
#include <iostream>
using namespace std;
 
// Time class template
class Time {
private:
    int HR, MIN, SEC;
 
    // Defining functions
public:
    // Functions to set the time
    // in the Time class template
    void setTime(int x, int y, int z)
    {
        HR = x;
        MIN = y;
        SEC = z;
    }
 
    // Function to print the time
    // in HH:MM:SS format
    void showTime()
    {
        cout << endl
             << HR << ":" << MIN << ":" << SEC;
    }
 
    // Function to normalize the resultant
    // time in standard form
    void normalize()
    {
        MIN = MIN + SEC / 60;
        SEC = SEC % 60;
        HR = HR + MIN / 60;
        MIN = MIN % 60;
    }
 
    // + Operator overloading
    // to add the time t1 and t2
    Time operator+(Time t)
    {
        Time temp;
        temp.SEC = SEC + t.SEC;
        temp.MIN = MIN + t.MIN;
        temp.HR = HR + t.HR;
        temp.normalize();
        return (temp);
    }
};
 
// Driver code
int main()
{
    Time t1, t2, t3;
    t1.setTime(5, 50, 30);
    t2.setTime(7, 20, 34);
 
    // Operator overloading
    t3 = t1 + t2;
 
    // Printing results
    t1.showTime();
    t2.showTime();
    t3.showTime();
 
    return 0;
}


Output: 

5:50:30
7:20:34
13:11:4

 




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