Using a non-constant pointer to non-constant data : const pointer « Pointer « C Tutorial

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C Tutorial » Pointer » const pointer

10. 9. 3. Using a non-constant pointer to non-constant data


#include <stdio.h>

#include <ctype.h>



void convertToUppercase( char *sPtr ); /* prototype */



int main()

{

   char string[] = "characters and abcde";



   printf( "The string before conversion is: %s", string );

   convertToUppercase( string );

   printf( "\nThe string after conversion is: %s\n", string ); 

          

   return 0;



}



void convertToUppercase( char *sPtr )

{

   while ( *sPtr != '\0' ) {

      if ( islower( *sPtr ) ) {

         *sPtr = toupper( *sPtr );

      }

      ++sPtr;

   } 

}

The string before conversion is: characters and abcde
The string after conversion is: CHARACTERS AND ABCDE

10. 9. const pointer
	10. 9. 1.	Attempting to modify a constant pointer to non-constant data
	10. 9. 2.	Attempting to modify data through a non-constant pointer to constant data.
	10. 9. 3.	Using a non-constant pointer to non-constant data
	10. 9. 4.	A non-constant pointer to constant data

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