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#include "stringandnumericcomparison.h"
using namespace std;
bool stringAndNumericLessThan(const string & a, const string & b)
{
unsigned long aidx=0;
unsigned long bidx=0;
while ((aidx<a.size()) && (bidx<b.size()))
{
if ( (0!=isdigit(a[aidx])) && (0!=isdigit(b[bidx])) )
{
// fetch numbers
long anumber=0;
long bnumber=0;
while ( (0!=isdigit(a[aidx])) && (aidx<a.size()) )
{
anumber*=10;
anumber+=a[aidx]-'0';
aidx++;
}
while ( (0!=isdigit(b[bidx])) && (bidx<b.size()) )
{
bnumber*=10;
bnumber+=b[bidx]-'0';
bidx++;
}
// the numeric comparison
if (anumber<bnumber)
{
return true;
}
if (anumber>bnumber)
{
return false;
}
}
else
{
// fetch character
char achar=a[aidx++];
char bchar=b[bidx++];
// the character comparison
if (achar<bchar)
{
return true;
}
if (achar>bchar)
{
return false;
}
}
}
// strings seem to be identical up to their common size
// last criterion: size of strings
return (a.size()<b.size());
}
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