Let users enter anything, save integers, give warning otherwise

1 次查看（过去 30 天）
J
J 2011-5-9
I want to let users enter any text into my application. I am using the disp() command for this.
I want the users to be able to enter anything. If they enter an integer I want to save it as a string or integer. If they enter anything else I want to give them a warning.
This code doesn't work. Can you help me fix it?
userVar = disp('Enter an integer: ')
if (isinteger(userVar))
% e.g. Enter an integer: 3
A = [A userVar]
else
% e.g. Enter an integer: 3,4
% e.g. Enter an integer: cha1r
warning('Only integers are accepted.')

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采纳的回答

Walter Roberson
Walter Roberson 2011-5-9
if mod(UserVar,1) == 0
OR
if UserVar == fix(UserVar)
There are other possibilities, too. Last year in CSSM we listed off at least a dozen different ways.

更多回答（1 个）

Matt Fig
Matt Fig 2011-5-9
A = [];
while 1
userVar = input('Enter an integer, (or return to quit): ');
if isempty(userVar)
break
elseif isnumeric(userVar) && fix(userVar)==userVar
A = [A userVar];
else
warning('Only integers are accepted.')
end
end
A % Show what user entered (optional)
%
%
%
EDIT Changed FLOOR to FIX for negative integers, thanks to Walter.
  2 个评论
Walter Roberson
Walter Roberson 2011-5-9
floor vs fix wouldn't matter: you don't care which way a value gets rounded as long as the rounded value is not exactly equal to the original value except for integral values.

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