iswlower() Function in C
Last Updated :
26 Dec, 2023
The iswlower() is a built-in function in C that checks whether the given wide character is a lowercase character or not.
iswlower() function is defined inside the <wctype.h> in C.
Syntax of iswlower() function
int iswlower(wint_t ch)
Here, wint_t is a wide integer type used to represent a wide character.
Parameters
- ch: It is the wide character which we have to check if it is a lowercase character or not.
Return Value
The iswlower() function returns two values as shown below:
- If the parameter ch is a lowercase character, then a non-zero value is returned.
- If it is not a lowercase character, then 0 is returned.
Note: The behavior of iswlower() function is Locale-Sensitive means it’s behavior can be affected by the current locale setting, Hence if the locale is set using std::locale then it may affect the behavior of wide character functions because it performs the check based on the rules of the current C locale.
Examples of iswlower() in C
Example 1:
The below program demonstrates the use of iswlower() function in C to check if the given wide character is a lowercase character or not.
C
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main()
{
wchar_t ch1 = L 'a' ;
wchar_t ch2 = L 'A' ;
if (iswlower(ch1))
wprintf(L "%lc is a lowercase character " , ch1);
else
wprintf(L "%lc is not a lowercase character " , ch1);
wprintf(L "\n" );
if (iswlower(ch2))
wprintf(L "%lc is a lowercase character " , ch2);
else
wprintf(L "%lc is not a lowercase character " , ch2);
return 0;
}
|
Output
a is a lowercase character
A is not a lowercase character
Explanation: The above program uses the iswlower() function in C to check whether the two wide characters, L’a’ and L’A’ (here L represent that it is a wide character literal of type wchar_t) are lowercase or not. It prints messages accordingly to indicate whether each given character is a lowercase character or not.
Example 2:
Another example to demonstrate the use of iswlower() function in C.
C
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main()
{
wint_t ch1 = L 'q' ;
wint_t ch2 = L '?' ;
if (iswlower(ch1))
wprintf(L "%lc is a lowercase character\n" , ch1);
else
wprintf(L "%lc is not a lowercase character\n" , ch1);
if (iswlower(ch2))
wprintf(L "%lc is a lowercase character\n" , ch2);
else
wprintf(L "%lc is not a lowercase character\n" , ch2);
return 0;
}
|
Output
q is a lowercase character
? is not a lowercase character
Example 3:
The below programs demonstrate the use of iswlower() function in a loop to process each character in a wide string.
C
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main()
{
wchar_t myStr[] = L "GeeksforGeeks" ;
for ( int i = 0; myStr[i] != L '\0' ; ++i) {
if (iswlower(myStr[i]))
wprintf(L "%lc is a lowercase character.\n" ,
myStr[i]);
}
return 0;
}
|
Output
e is a lowercase character.
e is a lowercase character.
k is a lowercase character.
s is a lowercase character.
f is a lowercase character.
o is a lowercase character.
r is a lowercase character.
e is a lowercase character.
e is a lowercase character.
k is a lowercase character.
s is a lowercase character.
Explanation: The above program iterates through each character of myStr (wide string “geeksforgeeks”) and prints a message only if the character is found to be a lowercase letter, using the iswlower() function.
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