Thread: Having troubles reading in file to array

Code:

#include<stdio.h>
#include<math.h>
#define NROWS 8
#define NCOLS 7
int main (void)
{
	FILE *input;
	int i;
	int j;
	double power[NROWS][NCOLS];

	input=fopen("power1.dat", "r");
	if(input==NULL)
		printf("Error opening input file. \n");
	else
	{
		for(i=0; i<NCOLS; i++)
			for(j=0; j<NCOLS; j++)
				printf("i is %d, j is %d with value %lf", i, j, power[i][j]);
	}
	return 0;
}

My i and js work fine but i dont get the right value for power[i][j], can anybody see anything wrong with it

to make my self more clear in power[0][0] the value should be 253 but instead i get 0.0000000000

You need fscanf() to read the double value from the file into the 2D array power.

I'm posting while doing a few other things, which is always risky, and it's untested, but I
think you can get the general idea, at least.

Code:

int r, c, maxRows, maxCols, gotit;

for(r = 0; i < maxRows; r++)   {
   for(c = 0; c < maxCols; c++)  {
         gotit = fscanf(in, "%d", data[r][c]);   //could be &data[r][c], so check that
         if(gotit < 1)
            goto done; 
   } 
}
done:
;
//labels (like done, here), may require a semi-colon on the next line