clc
clear all
disp('ABSTRACT')
disp('  Example showing the while-end loop')
disp(' ')
%% Example 2 - while loop
% Purpose: To display only the positive output of y=x^2-49 
%          as x goes from -10 to 10
x=-10;   % Starting point of x
disp('OUTPUTS')
while (x<=10)
    y=x^2-49;  
    if (y>0)
        fprintf('  y=%g, x=%g\n',y,x)
    end
    x=x+1;          %<- Adding 1 to the count 
end
disp(' ') 
%% additonal code from what is in book
disp('EXTRA EXAMPLE')
disp('  Stop loop when y becomes negitive')
% Purpose: Output the positive values of y & once negative, stop the loop.
x=-10;   % Starting point of x
disp('OUTPUTS')
while (x<=10) & y>0 % x must be less then 10 and y greater then 0
    y=x^2-49;       % calculate the value of y
    fprintf('  y=%2g, x=%g\n',y,x)
    x=x+1;          %<- Adding 1 to the count 
end