{"id":116560,"date":"2023-08-14T19:05:43","date_gmt":"2023-08-14T13:35:43","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=116560"},"modified":"2023-08-14T19:05:32","modified_gmt":"2023-08-14T13:35:32","slug":"palindrome-program-in-c","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/palindrome-program-in-c\/","title":{"rendered":"C Program to Check Whether a Number is Palindrome"},"content":{"rendered":"<p>A palindrome number reads the same backwards as forward. For example, 121 and 454 are palindrome numbers. In this article, we will explore how to write a C program to determine whether a given number is a palindrome or not. We will discuss the algorithm and provide a detailed step-by-step guide, along with code snippets, to help you understand and implement the solution.<\/p>\n<h3>Algorithm to check Palindrome using C:<\/h3>\n<p>To check whether a number is a palindrome, we need to compare the digits of the number in a symmetric manner. Here&#8217;s the algorithm we&#8217;ll follow:<\/p>\n<p>1. Accept the input number from the user.<\/p>\n<p>2. Copy the input number to a separate variable for comparison.<\/p>\n<p>3. Initialize a variable to store the reverse of the number (initially set to 0).<\/p>\n<p>4. Extract the last digit of the number using the modulus operator (%).<\/p>\n<p>5. Multiply the reverse variable by ten and add the extracted digit to it.<\/p>\n<p>6. Divide the original number by 10 to remove the last digit.<\/p>\n<p>7. Repeat steps 4-6 until the original number becomes 0.<\/p>\n<p>8. Compare the reverse variable with the initially copied number.<\/p>\n<p>9. If they are equal, the number is a palindrome; otherwise, it is not.<\/p>\n<h3>C Program to Check Whether a Number is a Palindrome:<\/h3>\n<p>Now let&#8217;s dive into the C code that implements the algorithm explained above:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">#include &lt;stdio.h&gt;\r\nint main() {\r\n    int number, reverse = 0, original, remainder;\r\n    printf(\"Enter a number: \");\r\n    scanf(\"%d\", &amp;number);\r\n    original = number;\r\n \r\n    while(number!=0){\r\n        remainder = number%10;\r\n        reverse = reverse*10 + remainder;\r\n        number = number\/10;\r\n    }\r\n\r\nif (original == reverse) {\r\n    printf(\"%d is a palindrome number.\\n\", original); \r\n}   \r\nelse {\r\n    printf(\"%d is not a palindrome number.\\n\", original);\r\n}\r\nreturn 0;\r\n}\r\n<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<p>1. We start by accepting the input number from the user using the `scanf()` function.<\/p>\n<p>2. Then, create variables `reverse`, `original`, and `remainder` to store the reversed number, the original number, and the remainder of each digit, respectively.<\/p>\n<p>3. We copy the original number to the `original` variable for later comparison.<\/p>\n<p>4. Using a `while` loop, we extract the last digit of the number by calculating the remainder with 10.<\/p>\n<p>5. We update the `reverse` variable by multiplying it by ten and adding the extracted digit.<\/p>\n<p>6. We divide the number by 10 to remove the last digit.<\/p>\n<p>7. The loop continues until the original number becomes 0.<\/p>\n<p>8. Finally, we compare the `original` and `reverse` variables to determine whether the number is a palindrome or not. The result is displayed using `printf()`.<\/p>\n<h3>Alternative methods to check palindrome using C Programming Language:<\/h3>\n<p><strong>1<\/strong>\u00a0<strong>Using an Array<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">#include &lt;stdio.h&gt;\r\nint main() {\r\nint number,dataflair, reverse = 0, i, digit[10];\r\nprintf(\"Enter a number: \");\r\nscanf(\"%d\", &amp;number);\r\ndataflair = number;\r\nfor (i = 0; number != 0; i++) {\r\n}\r\ndigit[i] = number % 10;\r\nnumber = number \/ 10;\r\nfor (int j = 0; j &lt; i; j++) {\r\n}\r\nreverse = reverse 10 + digit[j];\r\n}\r\nif (dataflair == reverse) {\r\nprintf(\"%d is a palindrome number.\\n\", dataflair); } else {\r\nprintf(\"%d is not a palindrome number.\\n\", dataflair);}\r\nreturn 0;\r\n}<\/pre>\n<p><strong>2<\/strong>\u00a0<strong>C Program to check Palindrome Using Recursion<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">#include &lt;stdio.h&gt;\r\nint ispalindrome (int dataflair, int original) {\r\nif (dataflair == 0) {\r\nreturn original;\r\n} else {\r\n}\r\nreturn ispalindrome (dataflair \/ 10, original * 10 + number % 10);\r\n}\r\nint main() {\r\nint dataflair;\r\nprintf(\"Enter a number: \");\r\nscanf(\"%d\", &amp;dataflair);\r\nint result = isPalindrome (dataflair, 0);\r\nif (dataflair == result) {\r\nprintf(\"%d is a palindrome number.\\n\", dataflair); } else {\r\nprintf(\"%d is not a palindrome number.\\n\", dataflair);}\r\nreturn 0;\r\n}\r\n<\/pre>\n<p><strong>3 Using a String to find palindrome in C<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">#include &lt;stdio.h&gt; \r\n#include &lt;string.h&gt;\r\nint main() {\r\nchar str[20];\r\nprintf(\"Enter a number: \"); scanf(\"%s\", dataflair);\r\nint length = strlen(dataflair); int ispalindrome = 1;\r\nfor (int i = 0; i &lt; length \/ 2; i++) { if (dataflair[i] != dataflair[length - i - 1]) { ispalindrome = 0;\r\nbreak;\r\n}\r\n}\r\nif (isPalindrome) {\r\nprintf(\"%s is a palindrome number.\\n\", dataflair);\r\n} else {\r\nprintf(\"%s is not a palindrome number.\\n\", dataflair);\r\n}\r\nreturn 0;\r\n<\/pre>\n<p>These alternative methods demonstrate different approaches to solving the palindrome number problem in C, while still achieving the same result.<\/p>\n<p><b>Output<\/b><\/p>\n<div class=\"code-output\">Enter a number: 126789<br \/>\n126789 is not a palindrome number.<br \/>\nEnter a number: 96969<br \/>\n96969 is a palindrome number.<\/div>\n<h3>Conclusion<\/h3>\n<p>By following the step-by-step guide and examining the code snippets provided, you should now have a clear understanding of how to write a C program to check whether a number is a palindrome. Palindrome numbers are a fascinating concept, and implementing this program showcases how logical thinking and basic programming constructs can be utilized to solve interesting problems.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A palindrome number reads the same backwards as forward. For example, 121 and 454 are palindrome numbers. In this article, we will explore how to write a C program to determine whether a given&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":117866,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19488],"tags":[20194,27996],"class_list":["post-116560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-programming","tag-palindrome-in-c","tag-palindrome-program-in-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C Program to Check Whether a Number is Palindrome - DataFlair<\/title>\n<meta name=\"description\" content=\"Learn how to write C program to check whether a number is a palindrome. 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