将Struct数组作为指针传递

Question

I would like to pass the struct array as an argument of the print function and then acces its members for printing. Why do I get a pointer error when I dont apss any pointers?

in main.c:

struct city {
    double longitude;
    double latitute;
    char name[buf_size]; 
};
int numCitToRead = 10;
struct city cities[25];
printCities(&numCitToRead, cities);

Note: The Struct array gets initialised in a file parsing function. It is always 25 fields long, but if numCitToRead is 10, Only 10 fields will be filled

int printCities(int* t_numCitToRead, struct city t_cities[25]) {

    for (unsigned short i = 0; i < *t_numCitToRead; i++) {
        printf("\n\n\tCity %d: ", i+1);
        printf("\nname:\t\t%s", t_cities[i].name);
        printf("\nlongitude:\t%f", t_cities[i].longitude);
        printf("\nlatitude:\t%f", t_cities[i].latitute);
    }
    return 0;
}

I hope someone can help me!

Greetings

Answer 1

Have modified the code and its working now. let's try it:

#include <stdio.h>

struct city {
    double longitude;
    double latitute;
    char *name; 
  };

int printCities(int* t_numCitToRead, struct city t_cities[25]) {

    for (unsigned short i = 0; i < *t_numCitToRead; i++) {
    printf("\n\n\tCity %d: ", i+1);
        printf("\nname:\t\t%s", t_cities[i].name);
        printf("\nlongitude:\t%f", t_cities[i].longitude);
        printf("\nlatitude:\t%f", t_cities[i].latitute);
    }
    return 0;
}

int main() {
  int numCitToRead = 10;
  struct city cities[25];
  // create dummy data
  for(int i =1; i<=25; i++)
  {
   cities[i-1].name = "name";
   cities[i-1].longitude =  10 * i;
   cities[i-1].latitute = 10 * 20;
  } 
 printCities(&numCitToRead, cities);
 return 0;
}

Thanks!

Answer 2

Thanks to everyone for the great support and helpful comments and suggestions.

After adjusting a few different things which were pointed out by people in this thread, it finally compiled succesfully.

The things I adjusted were:

• inlcuded the header file to the city struct data type definition in the printFunctions file

• initialized the struct to resolve pointer errors

Thanks for the great feedback and comments / suggestions.

Have a nice day!