islower is a function in C (part of ) that checks if a given character is a lowercase letter (a-z). It returns a nonzero value if the character is lowercase and zero otherwise. This function is commonly used in text processing, case conversion, and validation.

Example usage:

c
Copy
Edit
#include
#include

int main() {
char ch = 'g';
if (islower(ch)) {
printf("The character is lowercase.
");
More Visit- https://docs.vultr.com/clang/standard-library/ctype-h/islower