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    <p>So if you're in a hurry to get <em>anything</em>, and are not too concerned about efficiency, try this. I've adapted a function that I wrote for the following SO question: <a href="https://stackoverflow.com/questions/15375366/c-string-int-string-int/15375420#15375420">c++ string (int) + string (int)</a></p> <p>First, I modified the <code>Add</code> function to work for any base between 2 and 36:</p> <pre><code>const int MIN_BASE = 2; const int MAX_BASE = 36; static bool tablesInitialised = false; static char tblIntToChar[MAX_BASE] = {0}; static int tblCharToInt[256] = {0}; void InitTables() { if( tablesInitialised ) return; for( int i = 0; i &lt; 10; i++ ) { tblIntToChar[i] = '0' + i; tblCharToInt[tblIntToChar[i]] = i; } for( int i = 0; i &lt; 26; i++ ) { tblIntToChar[i+10] = 'a' + i; tblCharToInt['a' + i] = i + 10; tblCharToInt['A' + i] = i + 10; } tablesInitialised = true; } // Adds two numbers using long addition. string Add( const string&amp; a, const string&amp; b, int base=10 ) { InitTables(); if( base &gt; MAX_BASE || base &lt; MIN_BASE ) return ""; // Reserve storage for the result. string result; result.reserve( 1 + std::max(a.size(), b.size()) ); // Column positions and carry flag. int apos = a.size(); int bpos = b.size(); int carry = 0; // Do long arithmetic. while( carry &gt; 0 || apos &gt; 0 || bpos &gt; 0 ) { if( apos &gt; 0 ) carry += tblCharToInt[(unsigned char)a[--apos]]; if( bpos &gt; 0 ) carry += tblCharToInt[(unsigned char)b[--bpos]]; result.push_back(tblIntToChar[carry%base]); carry /= base; } // The result string is backwards. Reverse and return it. reverse( result.begin(), result.end() ); return result; } // Converts a single value to some base, intended for single-digit conversions. string AsBase( int number, int base ) { InitTables(); if( number &lt;= 0 ) return "0"; string result; while( number &gt; 0 ) { result += tblIntToChar[number%base]; number /= base; } reverse( result.begin(), result.end() ); return result; } </code></pre> <p>And, using all the above, here is a function to convert from one arbitrary base to another:</p> <pre><code>// Converts a number from one base to another. string ConvertBase( const string &amp; number, int oldBase, int newBase ) { InitTables(); string result; for( unsigned digit = 0; digit &lt; number.size(); digit++ ) { int value = tblCharToInt[(unsigned char)number[digit]]; if( result.empty() ) { result = AsBase( value, newBase ); } else { string temp = result; for( int i = 1; i &lt; oldBase; i++ ) { temp = Add( result, temp, newBase ); } result = Add( temp, AsBase(value, newBase), newBase ); } } return result; } </code></pre> <p>This is just something I hacked up using code I mostly had kicking around in my StackOverflow 'for fun' sandbox. It's pretty clunky the way it performs <code>oldBase</code> additions instead of just doing one multiplication. This would be a lot better if you made a <code>Multiply</code> function to do long multiplication.</p>
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