Converting Lowercase to Uppercase

#include <iostream.h> 
 #include <ctype.h>
 void convertToUppercase( char * );
 int main()
 {
 char string[] = "characters and $32.98";
 cout << "The string before conversion is: " << string;
 convertToUppercase( string );
 cout << "\nThe string after conversion is: "
 << string << endl;
 return 0;
 }
 void convertToUppercase( char *sPtr )
 {
 while ( *sPtr != '\0' ) {
 if ( *sPtr >= 'a' && *sPtr <= 'z' )
 *sPtr = toupper( *sPtr ); // convert to uppercase
 ++sPtr; // move sPtr to the next character
 }
 }

OUTPUT:
   The string before conversion is: characters and $32.98
   The string after conversion is: CHARACTERS AND $32.98