Case change in C++ (Mingw )

[inus]

I am new at programming and are having a hard time with C++ using Cohoon& Davidson as a guide. Can anybody recommend a good handbook for C++.

How would I change a the case of a string from Uppercase to Lowercase and vice versa.

Thank you

 

[MKuiper]

void ChangeCase ( char *s )
{ 
  if ( s == NULL )
     { return; }
  DWORD cbString = strlen ( s );
  char *c;
  for ( DWORD i1 = 0; i1 < cbString; i1++ )
     { c = s + i1;
       if ( *(c) >= 'A' && *(c) <= 'Z' )
          { *(c) += 32; } else
          { if ( *(c) >= 'a' && *(c) <= 'z' )
               { *(c) -= 32; } } } }

Marcel