iswalnum() function in C++ STL
The iswalnum() is a built-in function in C++ STL which checks if the given wide character is an alphanumeric character or not. It is defined within the cwctype header file of C++.
The following characters are alphanumeric:
- Uppercase letters: A to Z
- Lowercase letters: a to z
- Digits: 0 to 9
Syntax:
int iswalnum(ch)
Parameter: The function accepts a single mandatory parameter ch which specifies the wide character which we have to check that if it is alphanumeric or not.
Return Value: The function returns two values as shown below.
- If the ch is an alphanumeric character, then a non-zero value is returned.
- If it is not then 0 is returned.
Below programs illustrates the above function.
Program 1:
// Program to illustrate // iswalnum() function #include <cwctype> #include <iostream> using namespace std; int main() { wchar_t ch1 = '?' ; wchar_t ch2 = 'g' ; // Function to check if the character // is alphanumeric or not if (iswalnum(ch1)) wcout << ch1 << " is alphanumeric " ; else wcout << ch1 << " is not alphanumeric " ; wcout << endl; if (iswalnum(ch2)) wcout << ch2 << " is alphanumeric " ; else wcout << ch2 << " is not alphanumeric " ; return 0; } |
Output:
? is not alphanumeric g is alphanumeric
Program 2:
// Program to illustrate // iswalnum() function #include <cwctype> #include <iostream> using namespace std; int main() { wchar_t ch1 = '3' ; wchar_t ch2 = '&' ; // Function to check if the character // is alphanumeric or not if (iswalnum(ch1)) wcout << ch1 << " is alphanumeric " ; else wcout << ch1 << " is not alphanumeric " ; wcout << endl; if (iswalnum(ch2)) wcout << ch2 << " is alphanumeric " ; else wcout << ch2 << " is not alphanumeric " ; return 0; } |
Output:
3 is alphanumeric & is not alphanumeric
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