The iswxdigit() is a built-in function in C/C++ which checks if the given wide character is a hexadecimal digit character or not. It is defined within the cwctype header file of C++. The available hexadecimal numeric characters are:
- Digits (0 to 9)
- Lowercase alphabets from a to f
- Uppercase alphabets from A to F
Parameter: The function accepts a single mandatory parameter ch which specifies the wide character which we have to check that if it is a hexadecimal or not.
Return Value: The function returns two values as shown below.
- If the ch is a hexa decimal, then a non-zero value is returned.
- If it is not a hexa decimal then 0 is returned.
Below programs illustrates the above function.
a3lz is not a valid hexadecimal number 10dbe is a valid hexadecimal number
1441a is a valid hexadecimal number xyz2 is not a valid hexadecimal number
Similar Functions : isalpha() and isdigit() functions in C/C++ with example
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