C Program to Check Whether Character is Lowercase or Not using islower function

The C program below checks whether a given character is lowercase or not using the islower function:

#include <ctype.h>
#include <stdio.h>

int main() {
    char ch;

    printf("Enter a character: ");
    scanf("%c", &ch);

    if (islower(ch)) {
        printf("The character is lowercase.\n");
    } else {
        printf("The character is not lowercase.\n");
    }

    return 0;
}

Explanation of the steps: 1. Include the necessary header files: ctype.h for the islower function and stdio.h for standard input/output functions. 2. Declare a variable ch of type char to store the input character. 3. Prompt the user to enter a character using the printf function. 4. Read the character entered by the user using the scanf function and store it in the variable ch. 5. Use the islower function to check if the character is lowercase. The islower function returns a non-zero value if the character is lowercase, and 0 otherwise. 6. Use an if statement to check the return value of the islower function. If it is non-zero, print that the character is lowercase. Otherwise, print that the character is not lowercase. 7. Finally, return 0 from the main function to indicate successful execution of the program.

This program uses the islower function from the ctype.h header file to check if a character is lowercase or not. The function takes a single argument, which is the character to be checked. It returns a non-zero value if the character is lowercase and 0 otherwise. By using an if statement, the program determines whether to print that the character is lowercase or not based on the return value of the islower function.