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Full Discussion: Concatenate two strings
Top Forums Programming Concatenate two strings Post 302854945 by yifangt on Wednesday 18th of September 2013 04:45:53 PM
Old 09-18-2013
Concatenate two strings
Hello!
Can anyone explain line 28 for me? I was thinking *a would be replaced by *b, but it actually appends *a to *b. I know it is related to pointer address, but could not figure it out by myself. Thanks a lot!
Code:
  1 //Concatenate two strings
  2
  3 #include<stdio.h>
  4 char *stradd (char *, char *);
  5
  6 int main()
  7 {
  8   char a[] = "abcdefg";
  9   char b[] = "GHIJKLM";
 10   char *c;
 11   printf ("a: %s\n", a);
 12   printf ("b: %s\n", b);
 13   c = stradd (a, b);
 14   printf("c: %s\n", c);
 15 }
 16
 17 char *stradd (char *a, char *b)
 18 {
 19   char *p;
 20   p = a;
 21   while (*a != '\0')
 22     {
 23       a++;
 24       printf("%p\n", a);
 25     }
 26   while (*b != '\0')
 27     {
 28       *a = *b;
 29      // printf("+++%p\n", a);
 30       b++;
 31      // printf("%p\n", b);
 32       a++;
 33      // printf("append-%p\n", a);
 34     }
 35   return p;
 36
 37 }

 

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LEARN ABOUT MOJAVE

vdxprintf

XPRINTF(3)						   BSD Library Functions Manual 						XPRINTF(3)

NAME

     asxprintf, dxprintf, fxprintf, sxprintf, xprintf, vasxprintf, vdxprintf, vfxprintf, vsxprintf, vxprintf -- extensible printf

SYNOPSIS

     #include <printf.h>

     int
     asxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     dxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     fxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     sxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     xprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     #include <stdarg.h>

     int
     vasxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vdxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vfxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vsxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format,
	 va_list ap);

     int
     vxprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

DESCRIPTION

     These extensible printf (see xprintf(5)) variants behave like their normal printf counterparts (see printf(3)) without 'x' in the name
     (except sxprintf() and vsxprintf() behave like snprintf() and vsnprintf(), respectively).

     The domain argument must be a pointer to a printf domain structure, as returned by one of the functions described in xprintf_domain(3).  The
     loc argument should be an extended locale (see xlocale(3)) or NULL, which means to use the current locale in effect (either the per-thread
     locale if set, or the global locale by default).

SEE ALSO

     printf(3), xlocale(3), xprintf_domain(3), xprintf(5)

Darwin								   Aug 19, 2012 							    Darwin
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