String concatenation without strcat in C

Question

I am having trouble concatenating strings in C, without strcat library function. Here is my code

#include
#include
#include<         


        

Answer 1

It is better to factor out your strcat logic to a separate function. If you make use of pointer arithmetic, you don't need the strlen function:

#include 
#include 
#include  /* To completely get rid of this, 
                       implement your our strcpy as well */

static void 
my_strcat (char* dest, char* src)
{
  while (*dest) ++dest;
  while (*src) *(dest++) = *(src++);
  *dest = 0;
}

int 
main()
{
  char* a1 = malloc(100);
  char* b1 = malloc(100);

  strcpy (a1, "Vivek");  
  strcpy (b1, " Ratnavel");

  my_strcat (a1, b1);
  printf ("%s\n", a1); /* => Vivek Ratnavel */

  free (a1);
  free (b1);
  return 0;
}