fopen - Inputting a file to fill an array.

source.c

Code:

#include <stdio.h>

#define ARRAY_SIZE 20


int main()
{
    FILE * pointer;
    int test1[ARRAY_SIZE], test2[ARRAY_SIZE];
    int c, count;
    
    pointer = fopen("input.txt", "r");
    
    if(pointer == NULL)
    {
        printf("Open operation failed.");
        return 1;
    }
    
    fscanf(pointer, "%d", &count);
    
    for(c = 0; c < count; c++)
    {
        fscanf(pointer, "%d%d", &test1[c], &test2[c]);
    }
    
    fclose(pointer);

input.txt

Code:

7
78    88
79    67
80    90
81    56
82    76
83    99
70    82

Am I inputting the file into my two arrays correctly? Only asking because I am away from home and can only use public computers.

Thanks in advance,
~Alan

PS: Anyone know of a portable IDE compatible with MS C++? I was using CodeBlocks, but the source file would not compile correctly with MS C++, which is what my profs use to check for compile errors. Thanks again!

You need a tab ('\t', presuming that is a tab and not a fixed number of spaces*) in between those %d. I might include the newline too, altho it should work either way.

* this:

Code:

fscanf(pointer, "%d%*[ \t]%d"...

should cover either case. * means discard/ignore, [] indicates a string of characters in the set.

Originally Posted by MK27

You need a tab ('\t', presuming that is a tab and not a fixed number of spaces*) in between those %d. I might include the newline too, altho it should work either way.* this:

Code:

fscanf(pointer, "%d%*[ \t]%d"...

should cover either case. * means discard/ignore, [] indicates a string of characters in the set.

Thanks! And, would it be easier to just have one space in between instead of a tab? I'm totally new to reading files into the program. ;S

Originally Posted by MK27

You need a tab ('\t', presuming that is a tab and not a fixed number of spaces*) in between those %d.

Thats wrong.
No tab is needed in formatstring, each %d in scanf will eat all heading whitespaces.

Originally Posted by BillyTKid

Thats wrong.No tab is needed in formatstring, each %d in scanf will eat all heading whitespaces.

So, none of the what he said is needed? scanf will only search for the first two integers? Now you've got me confused lol. ;P