C library function difftime()

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#include <iostream>
#include <ctime>

using namespace std;

int main()
{
   time_t start, finish;
   long product;

   time(&start);
   for(int i=0; i<10000; i++)
   {
      for(int j=0; j<100000; j++)
      {
         product = i*j;
      }
   }
   time(&finish);
   cout << "Time required = " << difftime(finish, start) << " seconds";
   return 0;
}

Output

Time required = 3 seconds

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