Sort Structure

#include<bits/stdc++.h>
using namespace std;
typedef struct test
{
    int first_val;
    int second_val;
}test;
bool func(test a,test b)
{
    if(a.second_val<b.second_val)
    return 1;
    else return 0;
}
int main()
{
    test arr[] = { {5,6} , {8,1} , {6,4} , {4,9} , {2,9} , {7,3} };
    int n=sizeof(arr)/sizeof(test);
    sort(arr,arr+n,func);
    for(int i=0;i<n;i++)
    {
        cout<<arr[i].first_val<<" "<<arr[i].second_val<<endl;
    }
}