Source of timing_summation2.cpp

Structures and functions

  1: //timing_summation2.cpp
  2: //Finds the sum of integers over a given range.
  3: //Attempts to measure the time taken to sum these integers.

  5: #include <iostream>
  6: #include <ctime>
  7: using namespace std;

  9: int main()
 10: {
 11:     cout << "\nThis program computes the sum of all integers in a "
 12:         "user-chosen range, and\nattempts to compute as well the time "
 13:         "taken to perform the summation.";
 14:     cout << "\nPress Enter to continue ... ";  cin.ignore(80, '\n');

 16:     cout << "\nEnter the smaller integer, then the larger: ";
 17:     int small, large;
 18:     cin >> small >> large;  cin.ignore(80, '\n');  cout << endl;

 20:     int sum = 0;
 21:     clock_t startTime = clock();
 22:     for (int numberToAdd=small; numberToAdd<=large; numberToAdd++)
 23:         sum += numberToAdd;
 24:     clock_t endTime = clock();

 26:     cout << "The sum of all integers from " << small << " to "
 27:          << large << " (inclusive) is " << sum << ".\n";
 28:     cout << "The amount of time taken to add them up was " 
 29:          << double(endTime - startTime)/CLOCKS_PER_SEC << " seconds.";
 30:     cout << "\nPress Enter to continue ... ";  cin.ignore(80, '\n');
 31: }