fig07_10.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* Fig. 7.10: fig07_10.c
   Converting lowercase letters to uppercase letters
   using a non-constant pointer to non-constant data */

#include <stdio.h>
#include <ctype.h>

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

int main( void )
{
   char string[] = "characters and $32.98"; /* initialize char array */

   printf( "The string before conversion is: %s", string );
   convertToUppercase( string );
   printf( "\nThe string after conversion is: %s\n", string ); 
          
   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 */
      } /* end if */

      ++sPtr;  /* move sPtr to the next character */
   } /* end while */

} /* end function convertToUppercase */



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