#include <iostream>
#include <time.h>
#define sum(a,b) (a+b)
#define TIME_TILL_UTC_00(hr,min)                ((((23-(hr)) * 60) + ((60 - min))) * 60)
#define SECONDS_IN_A_DAY                        24*60*60
int main(){
    int x = 10, y = 20;
    int ans = sum(x,y);
    std::cout<<"ans: "<<ans<<"\n";
    time_t t = time(NULL);
    struct tm* ti = gmtime(&t);
    int secondToUtc00 = TIME_TILL_UTC_00(ti->tm_hour, ti->tm_min);
    std::cout<<"hr: "<<ti->tm_hour<<", min: "<<ti->tm_min<<"\n";
    std::cout<<"secondToUtc00: "<<secondToUtc00;
    std::cout<<"\nin a day"<<SECONDS_IN_A_DAY;
    return 0;
}

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