spojeni-textovych-retezcu.c

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#include <stdio.h>
#include <stdlib.h>

static size_t up1_strlen(const char *s) {
  size_t len=0;
  while (*s++) len++;
  return len;
}

char * spojeni( char *t1, char *t2) {
  char *pch0;
  char *pch2;
  pch0 = malloc(up1_strlen(t1) + up1_strlen(t2) + 1);
  pch2 = pch0;
  while ( *pch2++ = *t1++ ) ;
  pch2--;//musime couvnout zpet na koncovou '\0' kopie prvniho retezce
  while ( *pch2++ = *t2++ ) ;
  return pch0;
}

//note: do {...}while(0) se pouzivajako blok v makrech
#define SPOJENI(s1, s2) do {char *s12=spojeni((s1),(s2));\
                            printf("Spojeni slov \"%s\" a \"%s\" je \"%s\"\n", (s1),(s2),s12);\
                            free(s12);}while(0)

int main (int argc, char *argv[]) {
  int i;
  char *Ahoj = "Ahoj";
  char *Svete = "Svete";
  char *AhojSvete = spojeni("Ahoj", "Svete");
  printf("Spojeni slov \"%s\" a \"%s\" je \"%s\"\n", Ahoj, Svete, AhojSvete);
  free(AhojSvete);

  SPOJENI(Svete, Ahoj);
//progname[0] arg[1] arg[2] ... arg[argc-1]
  for(i=1; i < argc-2; i+=2) SPOJENI(argv[i], argv[i+1]);
  return EXIT_SUCCESS;
}