Count species in struct (C)

https://gyazo.com/3f4f71665339a8d881435a6f57ff7ae4 // Starting code #include  #include  #define MAX_SPECIES_NAME_LENGTH 128 #define MAX_SIGHTINGS 10000 // a struct to represent the date // a whale pod sighting was made struct date { int year; int month; int day; }; // a struct to represent a sighting // of a pod (group) of whales struct pod { struct date when; int how_many; char species[MAX_SPECIES_NAME_LENGTH]; }; int read_sightings_file(char filename[], int len, struct pod sightings[len]); int read_sighting(FILE *f, struct pod *w); int read_date(FILE *f, struct date *d); void species_count(char species[], int n_sightings, struct pod sightings[n_sightings], int *n_pods, int *n_whales); int main(int argc, char *argv[]) { if (argc != 3) { fprintf(stderr, "Usage: %s   ", argv[0]); return 1; } char *filename = argv[1]; char *species = argv[2]; struct pod whale_sightings[MAX_SIGHTINGS]; int n_sightings = read_sightings_file(filename, MAX_SIGHTINGS, whale_sightings); if (n_sightings < 1) { return 1; } int pod_count; int whale_count; species_count(species, n_sightings, whale_sightings, &pod_count, &whale_count); printf("%d %s pods containing %d whales in %s ", pod_count, species, whale_count, filename); return 0; } // number of pods of the specified species assigned to *n_pods // total number of whales of the specified species assigned to *n_whales void species_count(char species[], int n_sightings, struct pod sightings[n_sightings], int *n_pods, int *n_whales) { // REPLACE THIS COMMENT WITH YOUR CODE // THIS FUNCTION SHOULD NOT CALL SCANF OR PRINTF // IT SHOULD JUST ASSIGN VALUES to N_PODS AND N_WHALES *n_pods = 24; // CHANGE ME *n_whales = 42; // CHANGE ME } // // DO NOT CHANGE THE FUNCTION BELOW HERE // // return number of sightings read from filename // -1 is returned if there is an error int read_sightings_file(char filename[], int len, struct pod sightings[len]) { FILE *f = fopen(filename, "r"); if (f == NULL) { fprintf(stderr,"error: file '%s' can not open ", filename); return -1; } int n_sightings = 0; while (read_sighting(f, &sightings[n_sightings]) == 1 && n_sightings < len) { n_sightings = n_sightings + 1; } fclose(f); return n_sightings; } // return 1 if a sighting can be read, 0 otherwise int read_sighting(FILE *f, struct pod *s) { if (read_date(f, &(s->when)) != 1) { return 0; } if (fscanf(f, "%d", &(s->how_many)) != 1) { return 0; } fgetc(f); if (fgets(s->species, MAX_SPECIES_NAME_LENGTH, f) == NULL) { return 0; } // finish string at ' ' if there is one char *newline_ptr = strchr(s->species, ' '); if (newline_ptr != NULL) { *newline_ptr = '\0'; } // also finish string at ' ' if there is one - files from Windows will newline_ptr = strchr(s->species, ' '); if (newline_ptr != NULL) { *newline_ptr = '\0'; } return 1; } // return 1 if a date can be read, 0 otherwise int read_date(FILE *f, struct date *d) { int n_scanned = fscanf(f, "%d/%d/%d", &(d->year), &(d->month), &(d->day)); return n_scanned == 3; } 

Here is a file of example data which you can download to test your program. It looks like this:

head whales.txt 18/01/18 9 Pygmy right whale 01/09/17 21 Southern right whale 16/02/18 4 Striped dolphin 02/07/17 4 Common dolphin 19/02/18 4 Blue whale 21/02/18 38 Dwarf sperm whale 14/06/17 29 Southern right whale 20/06/17 3 Spinner dolphin 22/07/17 34 Indo-Pacific humpbacked dolphin 20/03/18 7 Long-finned pilot whale