Tips for Reading and Splitting Data in C Programming Lab Homework

[vuongstran]

Homework Statement

Well the program has several functions but I just really need help with reading a text file and splitting the data in the file into a one-dimensional array and a two-dimensional array

The text file is like this...
21

1110 1.5 5.4 6.0 9.8. 8.5 8.3 5.6 9.9
1112 1.5 5.4 6.0 9.8. 8.5 8.3 5.6 9.9

I have to somehow get the pin (1110 & 1112) into a 1-d array while putting the rest of the numbers into a 2-d array.

This is what I have so far.

/* =========================================================== */
/* Reads data of a file and places the first column of info
into a one dimensional array and the rest into a
table.
PRE: table = empty
ary = empty
POST:
*/
int readTable (double scores[][MAX_COLS], double diverId[], int lineSize, char fileName[])
{
// Local Declarations
FILE *fpScores;
int r, c;

// Statements
fpScores = fopen( "scores.txt", "r" );

int numOfDivers = 0;
fscanf(fpScores, "%d", &numOfDivers);
printf("The numbers of divers is %d.\n\n", numOfDivers);

for (r = 0; r < MAX_ROWS; r++)

printf("PIN DIF J1 J2 J3 J4 J5 J6 J7\n");
printf("=== === == == == == == == ==\n");

for (r = 0; r < MAX_ROWS; r++)
{
fscanf(fpScores, "%lf", &diverId[r]);
printf("%.1lf ", diverId[r]);
if( ( r + 1 ) % lineSize == 0 )
printf( "\n");
}

printf("\n");

...end of function

The problem is that the for loop goes through the file and makes every value have its own row like this:

1111
1.5
5.4
6.0
etc..

Any help with be appreciated. Thanks!

 

[exidez]

[b]for (r = 0; r < MAX_ROWS; r++) // I assume this is mistakenly placed here (it shouldn't be here)[/b] 

printf("PIN DIF J1 J2 J3 J4 J5 J6 J7\n");
printf("=== === == == == == == == ==\n");

for (r = 0; r < MAX_ROWS; r++)
{
fscanf(fpScores, "%lf", &diverId[r]);
printf("%.1lf ", diverId[r]);
if( ( r + 1 ) % lineSize == 0 )
printf( "\n");
}

I would run this code in a debugger and see why ( r + 1 ) % lineSize always returns 0.

Personally though i would have actually used a for loop within a for loop for this..

eg.

for (r = 0; r < MAX_ROWS; r++)
{
for (l = 0; l < lineSize ; l++)
{
fscanf(fpScores, "%lf", &diverId[l]);
printf("%.1lf ", diverId[l]);
}
printf("\n");
}

As the line is completely read, it will print a new line.
It will then repeat for the next line.
This is only a one dimension array though, so the array will get reused for each line (previous line data will be wiped from the array).
I am not quite certain how you want the data stored within the array though..

you could store it in a 2D array like diverId[r][l], it would still work the same. But i gather that's what scores[][] is for. You could get away with not using diverId[l] at all but it depends on the criteria of the program. I will leave that up to you :)