Skipping if Statement even though a has been set to 0, on matlab GUI

Hi, My code skips this if statement when I set a to 0, why does this happen? It should go into the if statement and display a but it doesn't.

a = get(handles.A_Value,'String');

if a == 0

disp(a)

end

Thank you!

[Bob Thompson]

When you try putting a debugger mark on this if statement, does it actually consider the if, or is something in the rest of your code causing it to skip over the statement entirely?

Could you share some more of the rest of your code? I would agree that it doesn't make sense that the if statement is never true, based on what you have shown, which makes me thing the problem isn't in the if statement itself, but somewhere in the rest of the code.

Answer 1

[Adam Danz]

a = get(handles.A_Value,'String');
% a is a string, not a number. 

% Option 1 is to convert a to a number
a = str2double(get(handles.A_Value,'String')); 
if a == 0
    disp(a)
end

% option 2 is to compare strings rather than numbers
a = get(handles.A_Value,'String');
if strcmp(a, '0')
    disp(a)
end
% but be careful because what if user enters 0.0
% in that case '0' is different than '0.0'

[Oliver Ferenczi]

Thank you!

[Adam Danz]

Glad I could help. Option 1 is the way to go (using str2double).