Digital clock c++ - c++

Question

Making a digital clock in c++ and I get these errors:
expected ; before reloj
statement is a reference, not call, to funcion 'time'
statement has no effect
''reloj'' is undeclared (first use this function)
Each undeclared identifier is reported only once for each function it appears
#include<iostream>
#include<Windows.h>
using namespace std;
struct time
{
int hr,mint,seg;
};
int main()
{
time reloj;
reloj.hr = 0;
reloj.mint = 0;
reloj.seg = 0;
for(int i = 0; i<24; i++)
{
if(reloj.hr == 23)
{
reloj.hr = 0;
}
for(int j = 0; j<60; j++)
{
if(reloj.mint == 59)
{
reloj.mint = 0;
}
for(int k = 0; k<60; k++)
{
if(reloj.seg == 59)
{
reloj.seg = 0;
}
cout<<reloj.hr<<" : "<<reloj.mint<<" : "<<reloj.seg<<endl;
reloj.seg++;
Sleep(1000);
system("Cls");
}
reloj.mint++;
}
reloj.hr++;
}
}

Answer 1

using namespace std; in the global namespace is a bad idea, and is probably dumping std::time there, along with a host of other names. This will clash with your time class.
Unfortunately, simply removing the evil using isn't a solution here, since time comes from the C library. Implementations are allowed to (and many do) dump names from the C library into the global namespace whether you want them there or not.
So your options are:
Rename your class, or put it in your own namespace;
Refer to it as struct time rather than just time;
Don't include any standard library headers, just in case they mess with your global names.

Answer 2

I have Another codes :
#include <iostream>
#include <unistd.h>
#include <ctime>
using namespace std;
void Timer()
{
int HOUR = 0, MINUTE = 0 , SECOND = 0;
time_t now = time(0);
tm *ltm = localtime(&now);
HOUR = ltm->tm_hour;
MINUTE = ltm->tm_min;
SECOND = ltm->tm_sec;
while(true)
{
system("clear");
cout << HOUR << ":" << MINUTE << ":" << SECOND << endl;
SECOND ++;
if(SECOND == 60)
{
MINUTE++;
SECOND = 0;
if(MINUTE == 60);
{
HOUR++;
MINUTE = 0;
if(HOUR ==24)
{
HOUR = 0;
}
}
}
sleep(1);
}
}
int main()
{
Timer();
}
*IF YOU USE THIS ON WINDOWS THEN CHANGE system("clear") into system("cls")