C Programming: Check whether a letter is lowercase or not

Last update on December 20 2024 13:21:37 (UTC/GMT +8 hours)

Write a program in C to check whether a letter is lowercase or not.

Sample Solution:

C Code:

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

int main() {
    char TestChar; // Variable to store the input character

    // Displaying the purpose of the program to the user
    printf("\n Check whether a letter is lowercase or not :\n");  
    printf("------------------------------------------------\n");

    // Prompting user to input a character
    printf(" Input a character : ");
    scanf("%c", &TestChar); // Taking input from user

    // Checking if the entered character is lowercase or not using islower() function
    if (islower(TestChar)) {
        printf(" The entered letter is a lowercase letter. \n"); // Printing the result
    } else {
        printf(" The entered letter is not a lowercase letter. \n"); // Printing the result
    }

    return 0; // Return 0 to indicate successful execution of the program
}

Sample Output:

 Check whether a letter is lowercase or not :
------------------------------------------------
 Input a character : w
 The entered letter is a lowercase letter.

Flowchart :

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