Thread: Is C playing tricks with me? Random Seg faults

Header #1 city.h

Code:

typedefstructCity{

    double* lat;
    double* lon;
    double* pop;


    char* airport;
    char* name;


}City; 

Header #2 vector.h

Code:

Header file #2 "vector.h"

typedefstructVector{


  City* cityArray[26];// 26 pointers to struct City


 }Vector;

C file

Code:

#include"vector.h"
#include"city.h"
#include<stdlib.h>

int main() {
Vector *cities;

init(cities); //calls function init


void init(Vector*ptr){

ptr->cityArray[0]->name ="hi";// Error Seg Fault! ptr = (Vector*) NULL

}

Earlier, I was able to compile and print out "hi" no problems. Now
all of a sudden, I'm getting seg faults each time. I'm 100% sure I'm running
the same code.

Whats going on? Is it because in city.h char* name is not initialized? I can't
initialize it, the compiler gives me an error when i try.

Post the smallest and simplest program that you expect to compile but which demonstrates the error.