Reading from a text file to a struct and print with justification

**Zorda** · 04-04-2018

Hello,

I've been trying to read and print the contents of a text file. The text file is like this:

1234 Orange Toyota 2010
5487 Blue Audi 1985

This is my code. The compiler shows NO erros but the program doesn't run.

Code:

#include <stdio.h>
#include <stdlib.h>
#define CARS_FILE "cars.txt"




typedef struct {
	int plateNumber, year;
	char color[10];
	char brand[10];
} Car;




int main()
{
	Car *cars;
	int i=0;
	FILE *myFile;
	
	myFile = fopen(CARS_FILE, "r");
	if(myFile == NULL)
	{
		printf("ERROR!\n");
		return 1;
	}
	while(fscanf(myFile,"%d\t%s\t%s\t%d\n", &cars[i].plateNumber, &cars[i].color, &cars[i].brand, &cars[i].year)!= EOF)
	{
		printf("%d\t%s\t%s\t%d\n", cars[i].plateNumber, cars[i].color, cars[i].brand, cars[i].year);
	}
	fclose(myFile);	
	system("PAUSE");
	return 0;
}

Any help would be much appreciated...

**GReaper** · 04-04-2018

You need to either allocate some space for cars with malloc and/or realloc or change it to a static array. Also, you need to increment the counter.

**Zorda** · 04-04-2018

GReaper could you elaborate, please; I'm new to C language and to programming in general...I incremented the counter. How can I use malloc?

**GReaper** · 04-04-2018

You need to allocate memory. malloc does that, for example if you want 10 elements you'd do:

Code:

cars = malloc(sizeof(Car)*10);

If you want to have dynamic size, you can use realloc. I'd use it like this:

Code:

cars = NULL;
carAmount = 0;
for (;;) {
    Car tempCar;
    /* Read next available car into tempCar, break if no more cars */

    ++carAmount;
    cars = realloc(cars, carAmount*sizeof(Car));
    cars[carAmount - 1] = tempCar;
}

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