text: /* Checks planet names */
  
  #include <stdio.h>
  #include <string.h>
  
  #define NUM_PLANETS 9
  
  int main(int argc, char *argv[])
  {
      char *planets[] = {"Mercury", "Venus", "Earth",
                         "Mars", "Jupiter", "Saturn",
                         "Uranus", "Neptune", "Pluto"};
      int i, j;
  
      for (i = 1; i < argc; i++) {
          for (j = 0; j < NUM_PLANETS; j++) 
              if (strcmp(argv[i], planets[j]) == 0) {
                  printf("%s is planet %d\n", argv[i], j+1);
                  break;
              }
          if (j == NUM_PLANETS)
              printf("%s is not a planet\n", argv[i]);
          }
      return 0;
  }