Table of Contents

Palindrome String C Program

In this tutorial, we’ll walk you through the steps to create a C program that checks if a given string is a palindrome using Code::Blocks.

Palindrome String

A palindrome string is a sequence of characters that reads the same forward and backward, ignoring spaces, punctuation, and capitalization.

Examples

For example, the following strings are palindrome strings

aba
madam
racecar

The following strings are NOT palindrome strings:

abcd
testingdocs

Prerequisites

Before we begin, ensure you have the following:

CodeBlocks IDE installed on your machine

Download and install Code::Blocks

Basic understanding of C programming.

Step-by-Step Guide

Step: Create a New project.

Step: Launch CodeBlocks IDE.

Step: Create a New File. for example, palindrome.c

Step: Write the palindrome C program code.

Palindrome String C Program

Code your C program in the editor.

/*
* C Program to check palindrome string.
* C Tutorials - www.TestingDocs.com
*/

#include <stdio.h>
#include <string.h>

int main() {
 char str[100], reversedStr[100];
 int length, i, j;

 printf("Enter a string: ");
 gets(str);

 length = strlen(str);

 // Reverse the string
 for(i = length - 1, j = 0; i >= 0; i--, j++) {
 reversedStr[j] = str[i];
 }
 reversedStr[j] = '\0'; // Null-terminate the reversed string

 // Check if the original string is equal to the reversed string
 if(strcmp(str, reversedStr) == 0) {
 printf("%s is a palindrome.\n", str);
 } else {
 printf("%s is not a palindrome.\n", str);
 }

 return 0;
}

Program Screenshot

Palindrome String C Program

Build and Run

Step: Build and Run the Program

Build the Program

Click on the Build gear icon or

Go to Build > Build to compile the code.

Run the Program

Click on the Run icon (Play button) or

Go to Build > Run.

Test Your Program

Step: Run Test cases on the program to verify the program output. After running the program, a console window will appear.

Palindrome C Program Output

Enter a string and press Enter.

The program will output whether the string is a palindrome or not.

Code Explanation

Let’s break down the code to understand what each part does:

Include Libraries:

The #include <stdio.h> and #include <string.h> lines include standard libraries for input/output and string manipulation.

Main Function: The int main() function is the program’s entry point.
String Input: gets(str) takes a string input from the user.
String Length: length = strlen(str) calculates the length of the string.
Reverse the String: A for loop reverses the input string and stores it in reversedStr.
Null-Terminate: reversedStr[j] = ‘\0’ adds a null character at the end of the reversed string.
Compare Strings: strcmp(str, reversedStr) compares the original and reversed strings.
Output Result: Based on the comparison, the program prints whether the input string is a palindrome.

That’s it. You’ve successfully written a C program to check for palindrome strings using CodeBlocks IDE. This exercise helps solidify your understanding of string manipulation and basic programming constructs. Keep practicing and exploring more programs to enhance your coding skills.