Code used to test the running time of a program in C ++

First code:
# Include <iostream>
# Include <ctime>
Using namespace STD;
Int main ()
{
Time_t begin, end;
Begin = clock ();
// Your code
End = clock ();
Cout <"RunTime:" <double (end-begin)/clocks_per_sec <Endl;
}
Decond code:
# Include <iostream>
# Include <windows. h>
Using namespace STD;

Void test () // Test Program
{
For (INT I = 0; I <10; I ++)
{
For (Int J = 0; j <10; j ++)
{
Printf ("% d, % d \ n", I, j );
}
}
}

Int main (void)
{
Large_integer begaintime;
Large_integer endtime;
Large_integer frequency;
Queryperformancefrequency (& frequency );
Queryperformancecounter (& begaintime );

// Code Put it here
Test ();

Queryperformancecounter (& endtime );

// Output running time (unit: S)
Cout <"running time (unit: S):" <(double) (endtime. quadpart-begaintime. quadpart)/frequency. quadpart <Endl;

System ("pause ");
Return 0;
}