Sum of a Range of Values 

This example calculates the sum of values in a range. The program requests two natural numbers from the users 
#include <iostream> using namespace std; int main() { long Sum = 0; long First, Last; cout << "This program allows you to calculate the sum of "; cout << "numbers\nfrom a lower to a higher values in a range\n"; cout << "Enter the first: "; cin >> First; cout << "Enter the last: "; cin >> Last; // Make sure that the last number is higher than the first // If not, inverse them if( First > Last ) { int Temp; Temp = First; First = Last; Last = Temp; } for( int Counter = First; Counter <= Last; Counter++ ) Sum += Counter; cout << "\nSum of numbers from " << First << " to " << Last << " = " << Sum << endl; return 0; }
Here is an example of running the program:
This program allows you to calculate the sum of numbers from a lower to a higher values in a range Enter the first: 4 Enter the last: 52 Sum of numbers from 4 to 52 = 1372 Press any key to continue

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