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isalnum

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< c‎ | string‎ | byte
 
C
 
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(C11)(C11)
 
Defined in header <ctype.h>
int isalnum( int ch );

Checks if the given character is an alphanumeric character as classified by the current C locale. In the default locale, the following characters are alphanumeric:

  • Digits (0123456789),
  • Uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ),
  • Lowercase letters (abcdefghijklmnopqrstuvwxyz).

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

Contents

[edit] Parameters

ch - character to classify

[edit] Return value

Non-zero value if the character is an alphanumeric character, ​0​ otherwise.

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