Strings: Concatenation

19 Years Ago Dave Sinkula 0 284 Views

How might I write an implementation in C of the standard library function strcat ? Here's how I might.

#include <stdio.h>

char *mystrcat(char *dst, const char *src)
{
   char *start = dst;
   while ( *dst )
   {
      ++dst;
   }
   do {
      *dst++ = *src;
   } while ( *src++ );
   return start;
}

int main (void)
{
   char text[12] = "Hello", more[] = " world";
   puts(text);
   puts(mystrcat(text, more));
   return 0;
}

/* my output
Hello
Hello world
*/

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