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Full Discussion: C Recursion (explain)
Top Forums Programming C Recursion (explain) Post 302416310 by seede on Monday 26th of April 2010 05:22:24 AM
Old 04-26-2010
C Recursion (explain)
Hi,

Question: how come the output is like that? Can explain to me abit. I am learning C.

Thanks!

Code:
#include <stdio.h>
#include <string.h>
void printit(char line_of_char[], int index);
int main()
{
char line_of_char[80];
int index = -1;
 strcpy(line_of_char, "This is a string.");
 printit(line_of_char, index);
 return 0;
}
void printit(char line_of_char[], int index)
{
 if(line_of_char[index])
 {
  index++;
  printf("+%c", line_of_char[index]); /*how come this is not being printed after "-" was printed*/
  printit(line_of_char, index);
  printf("-%c", line_of_char[index]);
 }
}
// Output is:
//+T+h+i+s+ +i+s+ +a+ +s+t+r+i+n+g+.+ - -.-g-n-i-r-t-s- -a- -s-i- -s-i-h-T

Last edited by seede; 04-26-2010 at 06:35 AM..
 

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LEARN ABOUT OSX

index

INDEX(3)						   BSD Library Functions Manual 						  INDEX(3)

NAME

     index, rindex -- locate character in string

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <strings.h>

     char *
     index(const char *s, int c);

     char *
     rindex(const char *s, int c);

DESCRIPTION

     The index() function locates the first occurrence of c (converted to a char) in the string pointed to by s.  The terminating null character
     is considered to be part of the string; therefore, if c is '', the functions locate the terminating ''.

     The rindex() function is identical to index(), except that it locates the last occurrence of c.

RETURN VALUES

     The functions index() and rindex() return a pointer to the located character, or NULL if the character does not appear in the string.

SEE ALSO

     memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3)

HISTORY

     The index() and rindex() functions appeared in Version 6 AT&T UNIX.  Their prototypes existed previously in <string.h> before they were moved
     to <strings.h> for IEEE Std 1003.1-2001 (``POSIX.1'') compliance.

BSD
								   June 4, 1993 							       BSD
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