help me do while function

2013 2 26
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0 个投票

Prompt the user to enter a value for height in inches (59-78) and weight in pounds (90-350). I don't know what I can't do that. I enter the height is 50, but it doesn't require me input again. it just show enter the weight.
inches = input('Enter the height in inches (59-78): ');
while (inches <59 && inches>78)
disp('Enter the height in inches (59-78): ');
end
pounds = input('Enter the weight in pounds (90-350): ');
while (pounds <90 && pounds > 350)
pounds = input('Enter the weight in pounds (90-350): ');
end

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Sean de Wolski
Sean de Wolski 2013-2-26

0 个投票

You are yusing && operators indicating that x has to be less than 59 and greater than 78. This isn't possible!
You probably mean to have a ||, the or operator.

更多回答（3 个）

THANH NGUYEN
THANH NGUYEN 2013-2-26

0 个投票

how about Enter F or M for gender. while gender is not equal to F gender is not equal to M
what is the notation for that? Thanks

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Sean de Wolski
Sean de Wolski 2013-2-26
Use strcmp
doc strcmp
Yopu may also need the ~ operator or not
doc not
E.g:
~strcmp('Sean','F')

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THANH NGUYEN
THANH NGUYEN 2013-2-26
编辑：Walter Roberson 2013-2-26

0 个投票

gender = input('Is the person a female or male? Enter F or M: ','s');
while (gender ~= 'F' || gender ~= 'f' || gender ~= 'M' || gender ~= 'm')
gender = input('Is the person a female or male? Enter F or M: ','s');
end
It keeps asking me enter the input all over and over even I type M,m,f,F. What's wrong with this

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Walter Roberson
Walter Roberson 2013-2-26
If the gender is 'F' then it is not 'M' so the "gender ~= 'M'" part would be true. No matter what you enter, one of the tests is going to be true, and you have used "or" between the parts. Perhaps you should not have used "or".
You should also have used strcmp() like Sean wrote.

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THANH NGUYEN
THANH NGUYEN 2013-2-26

0 个投票

I don't know how to do it. Can someone give an example to make my dump head understand how to do it? Thanks.

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