timer.cpp

#include<iostream>
#include<chrono>
int main()
{
    auto start = std::chrono::system_clock::now();
    auto end = std::chrono::system_clock::now();
    while((std::chrono::duration_cast<std::chrono::seconds>(end - start).count() != 2))
    {
        end = std::chrono::system_clock::now();
        cout<<"Time is"<<std::chrono::duration_cast<std::chrono::seconds>(end - start).count()<<" second"<<endl;
    }
    return 0;
}