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

int main()
{   
	// HAY NHAP VAO 1 SO NGUYEN DUONG N (N > 0)

	int n;

	do
	{
		printf("\nhay nhap vao so n : ");
		scanf("%d",&n);

		if(n <= 0)
		{
		   printf("\nso ban nhap khong hop le xin hay nhap lai cam on!");
		}
	} while (n <= 0);

	int temp = n;// luu bien phu , vi minh can hien thi bien chinh n , nen dat 1 gia tri = n de mimh thuc hien nhung thuat toan
	int sodaonguoc = 0;
	
	int dem = log10((double)temp); // neu nhap 4321 thi lay ra duoc la 3 chu so 

	while (temp != 0)
	{
		int chuso = temp % 10;
		temp /= 10;

		sodaonguoc += chuso * pow(10.0,dem--); // sodaonguoc + chu so * ^ma so log10 log ra vi vn 4321 la 4*10^3+ 3*10^2+2*10^1+1*10^0

	}
	//printf("\nso dao nguoc cua %d la %d",n,sodaonguoc);

	if(n == sodaonguoc)
	{
	   printf("\nla so doi xung ");
	}
	else
	{
		printf("\nkhong phai la so doi xung");
	}
	 
	
	getch();
	return 0;



}