Sum of 1 to N in C++
By: Grant Braught in C++ Tutorials on 2011-01-27
This sample C++ program accepts a number and prints the sum of all numbers from 1 to the entered number.
#include <iostream>
// Prototype for SumToN function.
int SumToN(int);
// main function is always run first in a
// C++ program.
int main()
{ //Given: nothing.
//Results: Accepts a number and
// writes out sum of all ints 1..num.
int number;
cout << "Enter an integer (>1): ";
cin >> number;
cout << "Sum of 1..Num = " << SumToN(number) << endl;
// This is more convention than anything.
return 0;
}
int SumToN(int number)
{ /*
Given: number an integer > 0
Returns: The sum of all the integers
between 1 and number.
*/
int i,total;
total = 0; // could use: int total = 0;
for (i=1; i<=number; i++)
{
total = total + i;
}
return total;
}
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