trenka

Untitled

Feb 25th, 2021
620
Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. sh-5.0$ cat 1.c
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. #define MAXLEN 100
  6.  
  7. void strcat2(char *destination, char *source);
  8.  
  9. int main()
  10. {
  11.     // create a character array. All of these C strings are terminated with a '\0'
  12.     char start[MAXLEN] = "This is a sentence looking for";
  13.     char end[] = " an ending!";
  14.  
  15.     // strcat2 destination, source
  16.     strcat2(start, end);
  17.  
  18.     // str is the same as &str[0] which is handed to printf and prints all the
  19.     // up to '\0'
  20.     printf("%s\n", start);
  21. }
  22.  
  23. void strcat2(char *start, char *end)
  24. {
  25.     // move pointer to end of start.
  26.     while (*start++)
  27.         ;
  28.    
  29.     // allows me to overwrite the null character
  30.     start--;
  31.  
  32.     while ((*start++ = *end++))
  33.         ;
  34. }
  35. sh-5.0$ gcc 1.c
  36. sh-5.0$ ./a.out
  37. This is a sentence looking for an ending!
  38. sh-5.0$
RAW Paste Data

Adblocker detected! Please consider disabling it...

We've detected AdBlock Plus or some other adblocking software preventing Pastebin.com from fully loading.

We don't have any obnoxious sound, or popup ads, we actively block these annoying types of ads!

Please add Pastebin.com to your ad blocker whitelist or disable your adblocking software.

×