%
% A04.m
%
% Calculate the sum of integers from 1 to N using a for loop
%
% Programming Concepts:  use of a for loop
%
% INPUT:    User is prompted to enter the number of terms in the sum, N
% OUTPUT:   The sum is displayed to the screen
%
% Matlab-Monkey.com
% 12/30/2014

% tidy-up your workspace
clc         % clear command window
clear       % clear all variables
close all   % close all graphics windows

% get info from user
N = input('Enter number of terms in sum:  ');

% initialize sum to zero
s = 0;

% Use a for loop to add numbers from 1 to N
for n=1:N
    s = s + n;
end

% display result to command window
% notice that because the variables N and s are integers, we use the %i 
% formatting in the fprintf statement 
fprintf('\n')
fprintf('Sum of numbers from 1 to %i = %i \n',N,s)




