#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

#define MAX 3

void InputRecord(int *ptrRank, int *ptrScore, char *ptrNickName);
void InputRecord(int *ptrRank, int *ptrScore, char *ptrNickName)
{
	printf("Please enter a rank: ");
	scanf("%d", ptrRank);
	printf("Please enter a score: ");
	scanf("%d", ptrScore);
	printf("Please enter a nick name: ");
	scanf("%s", ptrNickName);
}

void PrintRecord(int rank, int score, char *nick);
void PrintRecord(int rank, int score, char *nick)
{
	printf("%4d%5d%22s\n", rank, score, nick);
}

void PrintAllRecords(int rank[], int score[], char nick[][21]);
void PrintAllRecords(int rank[], int score[], char nick[][21])
{	
	int i;
	for(i=0; i < MAX; i++)
	{
		PrintRecord(rank[i], score[i], nick[i]);
	}
}

int SaveAll(int rank[], int score[], char nick[][21]);
int SaveAll(int rank[], int score[], char nick[][21])
{
	FILE *ptrOutFile;
	int i;

	ptrOutFile = fopen("scores.dat", "w");

	if (ptrOutFile == NULL) 
		return -1;

	for(i=0; i < MAX; i++)
	{
		fprintf(ptrOutFile, "%d %d %s\n", rank[i], score[i], nick[i]);
	}
	
	fclose(ptrOutFile);
	
	return i;
}

int LoadAll(int rank[], int score[], char nick[][21]);
int LoadAll(int rank[], int score[], char nick[][21])
{
	FILE * ptrInFile;
	int i;

	ptrInFile = fopen("scores.dat", "r");

	if (ptrInFile == NULL)
		return -1;
	i = 0;
	while (!feof(ptrInFile))
	{
		fscanf(ptrInFile, "%d%d%s", &rank[i], &score[i], nick[i]);
		i++;
	}

	fclose(ptrInFile);

	return i;

}


int main()
{
	int rank[MAX];
	int score[MAX];
	char nick[MAX][21];	// stores MAX nick names not exceeding 20 chars each
	
	int recordCount =0;
/*		
	int i;

	for(i=0; i < MAX; i++)
	{
		InputRecord(&rank[i], &score[i], nick[i]);
	}

	printf("\n-------- output --------\n");
	
	PrintAllRecords(rank, score, nick);
	
	SaveAll(rank, score, nick);
*/


	recordCount = LoadAll(rank, score, nick);
	PrintAllRecords(rank, score, nick);

	printf("Modify record number 2:\n");
	InputRecord(&rank[1], &score[1], nick[1]);
	SaveAll(rank, score, nick);

	return 0;
}