fig08_13.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. 8.13: fig08_13.c
   Using gets and putchar */
#include <stdio.h>

void reverse( const char * const sPtr ); /* prototype */
   
int main( void )
{  
   char sentence[ 80 ]; /* create char array */

   printf( "Enter a line of text:\n" );

   /* use gets to read line of text */
   gets( sentence ); 

   printf( "\nThe line printed backward is:\n" );
   reverse( sentence );

   return 0; /* indicates successful termination */

} /* end main */

/* recursively outputs characters in string in reverse order */
void reverse( const char * const sPtr )
{  
   /* if end of the string */
   if ( sPtr[ 0 ] == '\0' ) { /* base case */
      return; 
   } /* end if */ 
   else { /* if not end of the string */ 
      reverse( &sPtr[ 1 ] ); /* recursion step */

      putchar( sPtr[ 0 ] ); /* use putchar to display character */
   } /* end else */

} /* end function reverse */



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