clc
clear all
%% Chapter 22 - Exmaple 3:
disp('ABSTRACT')
disp('  Example of the for-end loop for a summation')
% Purpose: add the values of a general set of data
% INPUTS
disp(' ')
disp('INPUTS')
data=[2 7 4.5 2.3 6 5];
disp('  The input data is:')
disp(data')
% CODE
number  =length(data);  % number of elements in data vector
data_sum=0;             % starting point for summation
for j=1:1:number
    data_sum=data_sum + data(j);
end
% OUTPUTS
disp('OUTPUTS')
fprintf('  The summation of the data is %g\n\n',data_sum)

%% Extra Examples
% using loops and limited in addition, find the value of any two numbers
%    mulitplied together
disp('EXTRA EXAMPLES')
disp('Find the product of any two numbers')
disp(' ')
disp('METHOD 1 (for-end loop)- INPUTS')
% INPUTS
disp(' INPUTS')
a  = input('  Enter the first number: ');
b  = input('  Enter the second number: ');
% CODE/OUTPUTS
% Using a for-loop to find the product, a*b.
sumpf=0;  % Starting place for the sum
for i=1:1:a
    sumpf=sumpf+b;
end
fprintf(' OUTPUTS\n  The product is %g\n\n',sumpf)
disp('METHOD 2 (while-end loop)- INPUTS')
disp(' INPUTS')
disp('  Same as listed above')
sumpw=0;  % starting place for the sum
i=1;      % starting place for the loop counter
while (i<=b)
    sumpw=sumpw+a;
    i=i+1;
end
fprintf(' OUTPUTS\n  The product is %g\n\n',sumpw)