C <ctype.h> - islower() Function
The C <ctype.h> islower() function is used to check if the given character is a lowercase letter. In the default "C" locale, the following are the lowercase letters: abcdefghijklmnopqrstuvwxyz. Other locales may consider a different selection of characters as lowercase characters.
Syntax
int islower ( int ch );
Parameters
ch |
Specify the character to be checked, casted to an int, or EOF. |
Return Value
Returns non-zero value (i.e, true) if ch is a lowercase letter, else returns zero (i.e, false).
Example:
The example below shows the usage of islower() function.
#include <stdio.h>
#include <ctype.h>
int main (){
char str[50] = "99HEllo";
//counting the number of lowercase
//characters in str
int i = 0, count = 0;
while(str[i]) {
if(islower(str[i]))
count++;
i++;
}
//displaying the output
printf("%s contains %d lowercase letters.", str, count);
return 0;
}
The output of the above code will be:
99HEllo contains 3 lowercase letters.
❮ C <ctype.h> Library
