reverse   function 

1. Definition:

	We will set a function to reverse an integer and set 
	another function to test whether a string is palindrome.
	A palindrome is a string of characters that is read 
	the same forward or backward. The name "ajaja" is palindrome ..


2. The method in C language:

	1. The reverse function

	#include<stdio.h>
	#include<math.h>

	int get_number_digits(int n)
	{
	int count = 0;
	do
	{
	++count;
	n /= 10;
	}
	while(n != 0);
	return count;
	}


	int main()
	{
	int number,  reversed, next,i;
	int gamma1, gamma2;

	printf ("Enter a positive integer: -->  :");
	scanf("%d", &number);

	reversed = 0;
	int size = get_number_digits(number);
	//printf("\n The size is %d \n", size);

	for (i=1; i<=size; i++)
	{

	gamma1 = pow(10,(i-1));
	gamma2 = pow(10,i);

	next = (number/gamma1) - (number/gamma2*10);
	reversed = (reversed * 10) + next;
	}

	printf("\n The entered number is %d . Its reversed is %d \n", number, reversed);
	return 0;
	}




	2. Palindrome function

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


	int main()
	{
	char str;
	char * string = &str;
	int size;
	printf("\n Enter a string: -->  ");
	scanf("%s", &str);
	size = strlen(string);

	char tempo[size];

	strcpy(tempo,string);
	strrev(tempo);

	if(strcmp(string,tempo) == 0)
	printf("\n The entered string \"%s\" is palindrome. \n",string);
	else
	printf("\n The ntered string \"%s\" is not palindrome. \n",string);
	printf("\n The reversed string \"%s\" is  \n", strrev(string));
	return 0;
	}

	/*
	Notes:
	----------
	"strlen" returns the length of a string.
	"strcpy" copies a string to another.
	"strcmp" compares two strings.
	"strrev" reverses  a string.
	*/