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void palindrome(int n){
int reverse_n=0, int tempn=n;
while(n){
reverse_n*=10;
reverse_n+=n%10;
n/=10;
}
return tempn==reverse_n;
}

reverse, compare.
what is 6 decimal system??? base_6 representation?

how can you reverse a number? You have to change it to a string?

// count the number of digits.
count=0;
while(n) {++count;n/=10}

// now compare digits
for(i=1;i<count/2;++i){
   if(n/pow(10,count-i) != n % pow(10,i)
      return false;
}

void palindrome(int n){
int reverse_n=0, int tempn=n;
while(n){
reverse_n*=10;
reverse_n+=n%10;
n/=10;
}
return tempn==reverse_n;
}

Here is the logic,

bool palindrome(int n){

int reverseNumber = 0, constantFactor = 10, remainder = 0;
int originalNumber = n;

while(n){
remainder = n%constantFactor;
n /= 10;

reverseNumber = remainder + reverseNumber * constantFactor;
}

return originalNumber == reverseNumber;
}

private static bool isP(int n)
{
int m = n;
int p = 0;

while (n > 0)
{
p = p * 10 + n % 10;
n /= 10;
}
return (m == p);
}

int palindrome(int n)
{
int rev = 0;
int tmp = n;
int k;
while(tmp!=0)
{
k = tmp%10;
tmp = tmp/10;
rev = rev*10;
rev = (rev+k);
}
printf("rev--%d \n",rev);
while(rev!=0)
{
if(rev%10 !=n%10)
return 0;
rev = rev/10;
n = n/10;
}
return 1;
}

Algo:
1: convert the number into staring using itoa, ltoa or whatever suitable in-built function
2: take size of the string, n
3: then compare the i and n-i positions, increment i everytime till you reach the half

please correct me if i am wrong

bool palindrome(int num){
int reversenum, remainder;
int tmp=num;
if(tmp>0){

while(tmp)
{
remainder=tmp%10;
tmp=tmp/10;
reversenum=reversenum*10+remainder;
}
return (!(num^reversenum));
}
}

bool palindrome(int n)
{
int m = 1;
int x = n/10;
while(x)
{
m *=10;
x/=10;
}
bool Ispalindrome = true;
while(n)
{
if((n/m) != (n%10))
{
Ispalindrome = false;
break;
}
n %= m;
n /=10;
m /=100;
}
return Ispalindrome;
}

int reverse(int input)
{
	int num = 0;
	int mul = 1;
	while(input !=0)
	{
		num = num*mul + (input - (input/10)*10);
		mul = mul*10;
		input = input/10;

	}



	return num;
}

int main()
{
	int n1, n2;
	cin>>n1;

	n2 = reverse(n1);
	
	if(n1^n2 == 0)
		cout<<"YES"<<endl;
	else
		cout<<"NO"<<endl;


}