checking that a user input is an integer

The user is told to input an integer between 1 and 59 but I want an error message to display if the value they enter is not an integer. This is what I have so far:

prompt = {'Enter your first integer between 1 and 59'}; 
dlg_title = 'User inputs';
num_lines = 1;
answer = inputdlg(prompt,dlg_title,num_lines);
u=str2double(answer{1});

Answer 1

[Star Strider]

There are several ways of testing to see if the returned value is an integer.

You want to see if there is any non-zero value to the right of the decimal, so test for that. You can also experiment with the rem or mod functions.

Answer 2

[Roger Stafford]

Test whether this is true. If so, 'prompt' is an integer, otherwise it is not.

prompt==round(prompt)