Thread: Help - reading a file using array

hi,

can someone give me the idea on how to read the following file (student's mark text file) using array

No Matrix quiz1(5%) quiz1(5%) quiz1(5%) Proj(25%) MidT
1 BK20008 4 3 5 18 18
2 BK20002 5 5 4 10 8
3 BK20003 3 4 5 18 10
4 BK20006 4 3 4 20 14
5 BK20005 5 4 3 13 17
6 BK20004 2 5 2 4 16
7 BK20007 3 4 4 21 14
8 BK20001 4 3 5 11 15
9 BK20009 3 2 4 10 10
10 BK20010 4 3 3 23 18

i'm not asking for code because this is my project..After reading the file, the program have to calculate the grade and sort them, but first i have to know how to read this file

any kindly help i will be very appreciate!
thanks in advance

where is the problem ? you can read it like any other text file..

how would be the design of the code? can give me some example which i can refer to..

this is what i written so far..obviously it cannot run, it only can run if i remove first line and the matrix column. please tell me what to do..

Code:

#include <stdio.h>


void main (void)
{
	char matrix[200];
	int i, j, num_elem, no[20], quiz_1[20], quiz_2[20], quiz_3[20], project[20], midT[20], final[20];
    FILE *infile;

	infile = fopen("studentsmark.txt","r");

	i=1;

	while( fscanf(infile,"%d %s %d %d %d %d %d %d",&no[i],&matrix[i], &quiz_1[i], &quiz_2[i], &quiz_3[i], &project[i], &midT[i], &final[i]) !=EOF) i++;
	
    num_elem = i;

	for(j=1;j<num_elem;j++)
	{
	 printf("%d %s %d %d %d %d %d %d\n",no[j], matrix[i], quiz_1[j], quiz_2[j], quiz_3[j], project[j], midT[j], final[j]);
	}

	fclose(infile);

}

Hello,

I have also been trying to read data ( float type) from a .txt file. But i have some problems
Here is the code snippet.

Code:

		while(!feof(fp))                       //till end of file
		{
			
			i = fread( temp, sizeof(temp), 1, fp);  temp is a float variable.
                             
		}

I get a compiler error saying ( cannot convert from float to void*.

The text file has an array of float data.

1) What could be wrong in this?? ( i also tried type casting..but error remains)

2) Also, fread reads data sequentiallly right? .i.e element by element in a row and then next row..and so on?

Thanks.

fread() isn't going to work like you expect with text files. It's meant for binary data. It doesn't have any concept of rows or elements, just number of bytes to read. If your input file looks like this:

1254.323523

And do fread(buf, sizeof(float),1,fp), it's going to read 4 bytes and try to convert the binary representation of those 4 characters ("1254") into a floating point value. The result depends on exactly what machine you're running on, but my guess would be that you'd get either 2.5932651581683785e-9 or 1.6875198127763724e-7.

The next call to fread would grab ".323" and do the same thing. Like I said, not what you'd expect. If you're trying to read numbers from a file, and can read those numbers using a normal text editor, use fgets()/sscanf() for the input.

But to answer your question, the first argument of fread() expects a pointer. You're passing in a float. Use the operator that converts from "float" into "pointer to float" and it will compile.