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How to sort an array of dates in C/C++?
Suppose we have an array of dates. Here we will see how to sort then using C or C++ code. The dates are stored in a class (struct can be used in C also). We will use the sort function of the C++ STL. For comparing dates, we have to write our own compare function that will be used in the sort function. Let us see the example to get better view.
Example
#include<iostream>
#include<iostream>
#include<algorithm>
using namespace std;
class Date {
public:
int d, m, y;
};
bool compare(const Date &date1, const Date &date2){
if (date1.y < date2.y)
return true;
if (date1.y == date2.y && date1.m < date2.m)
return true;
if (date1.y == date2.y && date1.m == date2.m && date1.d < date2.d)
return true;
return false;
}
void sortDateArray(Date arr[], int n) {
sort(arr, arr+n, compare);
}
int main() {
Date arr[] = {{20, 1, 2017},
{25, 3, 2010},
{ 3, 12, 1956},
{18, 10, 1982},
{19, 4, 2011},
{ 9, 7, 2013}};
int n = sizeof(arr)/sizeof(arr[0]);
sortDateArray(arr, n);
cout << "Sorted dates are" << endl;
for (int i=0; i<n; i++) {
cout << arr[i].d << " " << arr[i].m << " " << arr[i].y << endl;
}
}Output
Sorted dates are 3 12 1956 18 10 1982 25 3 2010 19 4 2011 9 7 2013 20 1 2017
Updated on: 03-Jan-2020
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