chore(C): add palindrome program (#504)

Co-authored-by: Rahul Rajeev Pillai <66192267+Ashborn-SM@users.noreply.github.com>
Co-authored-by: Ming Tsai <37890026+ming-tsai@users.noreply.github.com>

algorithms/C/README.md

@@ -22,6 +22,9 @@
 - [Doubly Linked List](linked-lists/doubly-linked-list.c)
 - [Glued-Linked-List](linked-lists/gl-threads.c)
 
+## Maths
+- [Palindrome Number](Maths/palindrome.c)
+
 ## Queues
 - [Double Ended Queue using array](queues/double-ended-queue-using-array.c)
 

algorithms/C/maths/palindrome.c

@@ -0,0 +1,34 @@
+// This program is used to calculate palindrome number in C
+// a palindrome number is a number which is same on reversing that number
+
+#include <stdio.h>		//header
+int main ()				//main function
+{
+  int num, rev = 0, r, s;	//define variables
+  printf (" enter the number: ");
+  scanf ("%d", &num);		// taking input
+  s = num;			//assigning num to s
+  while (s > 0)
+    {				// loop starts
+      r = s % 10;
+      rev = rev * 10 + r;	// calculating reverse
+      s = s / 10;
+    }
+  if (num == rev)
+    {				// checking if condition
+      printf ("Palindrome");	//printing if number is palindrome
+    }
+  else
+    {
+      printf ("Non-palindrome");	//printing if number is not palindrome
+    }
+  return 0;			//returning main function
+}
+
+//      sample input    ||      sample output
+//          121         ||      Palindrome
+//          438         ||      Non-palindrome
+//          787         ||      Palindrome
+//          975         ||      Non-Palindrome
+
+// This program is having time complexity of O(N).

algorithms/CPlusPlus/README.md

@@ -132,7 +132,6 @@
 10. [Factorial of a number](Maths/factorial.cpp)
 11. [Prime-number](Maths/prime-number.cpp)
 
-
 # Recursion
 
 1. [Tower of Hanoi](Recursion/towerofHanoi.cpp)