If statement gives wrong result

Question

Xinjie Qian 2021-9-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1455139-if-statement-gives-wrong-result

回答： Shanmukha Voggu 2021-9-29

So I have the follwing Matlab code:

if isKey(containers.Map(str2, str),hasher("YR_.1EC9", 'Algorithm', 'SHA256'))
    fprintf('no')
else
    fprintf('You can use this name')
end

if I run it, it tells me

You can use this name>>

. But if I seperately excute :

isKey(containers.Map(str2, str),hasher("YR_.1EC9", 'Algorithm', 'SHA256'))

It tells me

ans =
  logical
   1

I'm so confused as if the logical statement is 1, shouldn't the if statement gives me 'no'?

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KSSV 2021-9-17

If it is logical 1 then it should say No. But check while you run the code did you overwrite any variable such that answer is 1. You better run in debug mode and check,

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Answer 1

Shanmukha Voggu 2021-9-29

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1455139-if-statement-gives-wrong-result#answer_797859

Hi Xinjie,

There may be several reasons for this issue

1)For example if you wrote the code that is going to make changes to str2 variable after the if-else-end, this might change the output of the isKey function when you run it

2)if the hasher function output is not same when executing it multiple times with the same input

if above statements cannot resolve the issue, then try debugging using the breakpoints. We need some more information about the code in order to reproduce and further investigate the issue

Refer to this for more information.