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