Segmentaton Fault - c++

Question

I was trying to work on a CodeChef problem (Problem Link :: http://www.codechef.com/problems/K2). The code should take in a input for each test case, process, display the result, before moving to the next testcase. But it is just taking inputs without any output.
I am unable to figure out the error as the g++ compiler isn't giving any.
#include <iostream>
#include <string>
#include <cstring>
#include <stdio.h>
using namespace std;
using std::string;
char baseArr[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
bool isPalin(string number)
{
int len=number.size();
bool flag=true;
for(int i=0; i<len/2, flag==true; i++)
{
if(number[i]==number[len-(i+1)])
continue;
else
{
flag=false;
}
}
return flag;
}
string baseChange(long int number, int base)
{
int i=1;
int rem=0;
string output =" ";
while(number>0)
{
rem=number%base;
number=number/base;
output=baseArr[rem]+output;
}
return output;
}
int main()
{
long int input;
int testcase;
string number;
int i;
bool palin=false;
scanf("%d", &testcase);
while(testcase--)
{
palin=false;
scanf("%ld", &input);
for(i=2; palin==false;i++)
{
{
palin=isPalin(baseChange(input, i));
}
}
printf("%d\n",i);
}
}

Answer 1

You assume that the maximum base will be 16, but this may not be the case. You are probably getting a segmentation fault for accessing baseArr beyond valid index. I have not thought of the solution, but I believe the actualy solution can be implemented without considering any character value for the digits.

Answer 2

A solution to the Palindrome problem:
#include <sstream>
#include <cstdlib>
bool test_palindrome(const std::string& value)
{
for (unsigned int i = 0; i < value.length() / 2; i++)
{
if (value[i] != value[value.length() - 1 - i])
return false;
}
return true;
}
std::string find_palindrome(unsigned long num)
{
std::string ret = "";
for (int i = 2; i <= 32; i++)
{
char buffer[100] = {0};
std::string value = ::itoa(num, buffer, i);
std::cout << "Testing: Base=" << i << " Value=" << value << std::endl;
bool test = test_palindrome(value);
if (test)
{
std::stringstream ss;
ss << value << " (base " << i << ")";
ret = ss.str();
break;
}
}
return ret;
}
int main()
{
unsigned long input = 0;
std::cout << "Enter number to search: ";
std::cin >> input;
std::string palin = find_palindrome(input);
std::cout << std::endl << "Palindrome Found: " << palin << std::endl;
return 0;
}