C islower()
islower() function is used to check whether a character is a lowercase letter or not. It is a standard library function defined in the <ctype.h> header file.
Syntax:
int islower(int ch);
Here, ch is the character to be checked.
Return Value:
- If the character is a lowercase letter, the function returns a non-zero value.
- If the character is not a lowercase letter, it returns 0.
Example:
Input: A The given character is not a lowercase letter Input: a The given character is a lowercase letter Input: 1 The given character is not a lowercase letter
C
// C program to demonstrate // the islower() function #include <ctype.h> #include <stdio.h> int main() { char ch = 'g' ; if ( islower (ch) != 0) { printf ( "The given character is a lowercase letter.\n" ); } else { printf ( "The given character is not a lowercase " "letter.\n" ); } return 0; } |
Output:
The given character is a lowercase letter.