Using timers to measure execution time

In this example we are using the Real_Timer class to measure the execution time of a simple program. The Real_Timer class is included in the itmisc library.

#include <itpp/itbase.h>
 
using namespace itpp;
 
//These lines are needed for use of cout and endl
using std::cout;
using std::endl;
 
int main()
{
  //Declare the scalars used:
  long i, sum, N;
 
  //Declare tt as an instance of the timer class:
  Real_Timer tt;
 
  //Initiate the variables:
  N = 1000000;
  sum = 0;
 
  //Start and reset the timer:
  tt.tic();
 
  //Do some processing
  for (i = 0; i < N; i++) {
    sum += i;
  }
 
  // Print the elapsed time
  tt.toc_print();
 
  //Print the result of the processing:
  cout << "The sum of all integers from 0 to " << N - 1 << " equals " << sum << endl;
 
  //Exit program:
  return 0;
 
}

When you run this program, the output will look something like this:

Elapsed time = 0.000797055 seconds
The sum of all integers from 0 to 999999 equals 1783293664