check lowercase letters c++

In C++, to check if a character is a lowercase letter, you can use the islower() function from the <cctype> library. This function takes a character as an argument and returns a non-zero value if the character is a lowercase letter, and 0 otherwise. Here's an example of how you can use it:

#include <iostream>
#include <cctype>

int main() {
    char ch = 'a';
    if (islower(ch)) {
        std::cout << "The character is a lowercase letter." << std::endl;
    } else {
        std::cout << "The character is not a lowercase letter." << std::endl;
    }
    return 0;
}