I guess you want to make arrays of pointers instead of arrays of characters.
Try this:
#include <stdio.h> #include <stdlib.h> #include <time.h> #include <string.h> int main(void){ int randomNum; const char *takenWords[4]; const char *words[20]={"DOG", "CAT", "ELEPHANT", "CROCODILE", "HIPPOPOTAMUS", "TORTOISE", "TIGER", "FISH", "SEAGULL", "SEAL", "MONKEY", "KANGAROO", "ZEBRA", "GIRAFFE", "RABBIT", "HORSE", "PENGUIN", "BEAR", "SQUIRREL", "HAMSTER"}; srand(time(NULL)); for(int i=0; i<4; i++){ int dupe=0; do{ randomNum = (rand()%20); takenWords[i]=words[randomNum]; dupe=0; for(int j=0;j<i;j++){ if(strcmp(words[randomNum],takenWords[j])==0)dupe=1; } }while(dupe); printf("%s\n", words[randomNum]); } getchar(); return 0; }