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How to get time in a class

codebusters (16)
Hi, I am trying to print the hour and minute every time an object of a class (Time) is created.
I can get the time using the code below in my main function, but every time I try to put it inside my Time.cpp constructor, I get an error saying I have not declared clock_t.
So how should I do it? Thanks.

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#include <iostream>
#include <ctime>
using namespace std;
#include "Time.h"

Time::Time()
{    
    time_t t = time(0);
    struct tm * now = localtime( & t );
    cout << now->tm_hour << ":" << now->tm_min << ":" << now->tm_sec << endl;
}
Last edited on
closed account (48T7M4Gy)
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#include <iostream>
#include <ctime>

class X{
    public:
    X() { timestamp(); }
    void timestamp();
};

void X::timestamp()
{    
    time_t t = time(0);
    struct tm * now = localtime( & t );
    std::cout << now->tm_hour << ":" << now->tm_min << ":" << now->tm_sec << '\n';
}

int main()
{
    X x;
    return 0;
}

14:18:31
 
Exit code: 0 (normal program termination)
Peter87 (11179)
That's strange since you are not even using clock_t. What do Time.h look like?
codebusters (16)
@kemort, When I try copy pasting your code in my main.cpp it works. But when I try to seperate it into .h and .cpp file I get the same error.

@Peter87. here are my files,

X.h
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#ifndef X_H
#define X_H
#include <ctime>
class X{
    public:
    X();
    void timestamp();
};
#endif // X_H


X.cpp
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#include <iostream>
#include <ctime>
#include "X.h"
using namespace std;
X::X()
{
    timestamp();
}


void X::timestamp()
{
    time_t t = time(0);
    struct tm * now = localtime( & t );
    cout << now->tm_hour << ":" << now->tm_min << ":" << now->tm_sec << '\n';
}


main.cpp
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#include <iostream>
#include <ctime>
using namespace std;
#include "X.h"

int main()
{
    X x;
}
Last edited on
closed account (48T7M4Gy)
XTime.cpp
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#include "X.h"

int main()
{
    X x;
    return 0;
}


X.h
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#ifndef X_h
#define X_h

class X{
public:
    X() { timestamp(); }
    void timestamp();
};

#endif


X.cpp
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#include "X.h"
#include <iostream>
#include <ctime>

void X::timestamp()
{
    time_t t = time(0);
    struct tm * now = localtime( & t );
    std::cout << now->tm_hour << ":" << now->tm_min << ":" << now->tm_sec << '\n';
}



16:36:1
Program ended with exit code: 0


@codebusters This is what XCode produces. I haven't looked at yours carefully but I think you need to address the order and disposition of the #includes. Only put them in where you need them. Blanket #includes often don't jag the right answer. :)
Last edited on
codebusters (16)
@kemort, Thanks so much! I don't know where I was going wrong, but it works now.
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