iswalnum() function in C++ STL
Last Updated :
21 Aug, 2018
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:
#include <cwctype>
#include <iostream>
using namespace std;
int main()
{
wchar_t ch1 = '?' ;
wchar_t ch2 = 'g' ;
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:
#include <cwctype>
#include <iostream>
using namespace std;
int main()
{
wchar_t ch1 = '3' ;
wchar_t ch2 = '&' ;
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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