構造体の入れ子を関数に渡す時の注意[C言語]

入れ子の構造体はp->start.horizontal;
アロー演算子の使い方に注意

#include 

typedef struct{
	double horizontal;//x	座標
	double vertival;//y
}COORDINATE;

typedef struct{
	COORDINATE start;
	COORDINATE goal;
	COORDINATE present;
	int total_time;
	int now_time;
}PLANE;

int input_data(PLANE* p);
int calc_data(PLANE* p);
int output_data(PLANE* p);

int main(void){

	PLANE p;
	
	input_data(&p);
	output_data(&p);

	return 0;
}

int input_data(PLANE* p){

	do{
	printf("Input the X coordinate of staring point >>");
	scanf( "%lf", &p->start.horizontal );
	}while(p->start.horizontal < 0);
	
	do{
	printf("Input the Y coordinate of staring point >>");
	scanf( "%lf", &p->start.vertival );
	}while(p->start.vertival < 0);
	
	
	do{
	printf("Input the X coordinate of arrival point >>");
	scanf( "%lf", &p->goal.horizontal );
	}while(p->goal.horizontal < 0);
	
	do{
	printf("Input the Y coordinate of arrival point >>");
	scanf( "%lf", &p->goal.vertival );
	}while(p->goal.vertival < 0);
	
	printf("\n");
	
	do{
	printf("Input the flight time >>");
	scanf( "%d", &p->total_time);
	}while(p->total_time < 0);
	
	do{
	printf("Input the time after departure >>");
	scanf( "%d", &p->now_time);
	}while(p->now_time < 0 || p->total_time < p->now_time);
	
	printf("\n");
	
	calc_data(p);
	
	return 0;
}

int calc_data(PLANE* p){

	p->present.horizontal = p->start.horizontal + ((p->goal.horizontal - p->start.horizontal)/p->total_time * p->now_time);
	p->present.vertival = p->start.vertival + ((p->goal.vertival - p->start.vertival)/p->total_time * p->now_time);


	return 0;
}

int output_data(PLANE* p){

	printf("Coordinate of starting point x: %8.2lf ,y: %8.2lf \n",p->start.horizontal,p->start.vertival);
	
	printf("Coordinate of arrival point x: %8.2lf ,y: %8.2lf \n",p->goal.horizontal,p->goal.vertival);
	
	printf("Flight time %3d\n\n",p->total_time);
	
	printf("%3d minutes have passed after departure\n",p->now_time);
	
	printf("Coordinates at present point x:%8.2lf, y:%8.2lf \n",p->present.horizontal,p->present.vertival);
	
	return 0;
}

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