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C COMPILER LIBRARY FUNCTIONS->Detailed Descriptions->isalnum()
|int isalnum(int c);||Test for alphanumeric ('A'-'Z', 'a'-'z' or '0'-'9')|
c Integer to be tested
This function tests the integer passed to it to see if it is an lphanumeric character: 'A'-'Z', 'a'-'z' or '0'-'9'.
The ASCII character set is assumed.
TRUE (1) is returned if the character is alphanumeric, otherwise FALSE (0) is returned.