fig05_10.cpp

《c＋＋大学教程》源码

// Fig. 5.10: fig05_10.cpp
// Converting lowercase letters to uppercase letters
// using a non-constant pointer to non-constant data.
#include <iostream>

using std::cout;
using std::endl;

#include <cctype>    // prototypes for islower and toupper

void convertToUppercase( char * );

int main()
{
   char phrase[] = "characters and $32.98";

   cout << "The phrase before conversion is: " << phrase;
   convertToUppercase( phrase );
   cout << "\nThe phrase after conversion is:  " 
        << phrase << endl;

   return 0;  // indicates successful termination

} // end main

// convert string to uppercase letters
void convertToUppercase( char *sPtr )
{
   while ( *sPtr != '\0' ) {   // current character is not '\0'

      if ( islower( *sPtr ) )  // if character is lowercase,
         *sPtr = toupper( *sPtr );  // convert to uppercase

      ++sPtr;  // move sPtr to next character in string

   } // end while

} // end function convertToUppercase

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