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C Discussion Thread
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Mar 17th, 2006

check number is string

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how to check there exist number in string using isalpha.if number exist, display "only alphabetic,please input again"

example :
user input = i had to 2 number

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Mar 17th, 2006

Re: check number is string

Is it really that hard?

C Syntax (Toggle Plain Text)
if(isalpha(char))
if(isalpha(char))

I don't know if that takes a string or not, but if it's only a character then just loop through.

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Postaholic

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Mar 17th, 2006

Re: check number is string

If isalpha() failes it does not mean that the character is a numeric digit, it could be anything else too. If you want to check for numeric digits then use isdigit(). And both only check one character, so if you have a whole string then you must check each character individually.

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Mar 17th, 2006

Re: check number is string

If you want to make sure there are no numbers in a string, you can do a find_first_of( "01234567890"). If it equals anything other than string::npos, it's got a number in there.

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Jun 12th, 2010

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