Trying to read data from an array. (help) (short code)

Code:

---


 void read_file(FILE *fp,double arr[][5]); //book says to omit the row array, so thats why its [ ]
int main(int argc, char* argv[])
  {
  double arr[6][5];
  FILE *fp;
  fp=fopen(argv[1],"r");

void read_file(FILE*fp,double arr[][5])
  {
  int i=0;
  int j=0;
  while(fscanf(fp,"%lf%lf%lf%lf%lf",&arr[i][j])!=EOF)
  {
  i++;
  j++;
  }

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Error: Line: 12 warning: format '%lf' expects a matching 'double *' argument [-Wformat]


I dont know what this means and how can i fix it?

&arr[i][j] this is only one double, you have 6 doubles in your fscanf.

Quote:

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Originally Posted by camel-man

&arr[i][j] this is only one double, you have 6 doubles in your fscanf.

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but the file im reading from has 6 numbers across the row

You will have to read one double across each column, then move to the next row.

You're scanning for six values, but only providing one location for them. If you're reading input with a loop, you likely should only be reading in one value for each iteration. And in that case, the index variables ('i' and 'j') wouldn't be incremented at the same time.

Also, it appears that you have a curly brace mismatch.

If you indent your code properly, you will see it quickly.

"Allman" Indentation (My prefered style)

Code:

---

int main(void)
{
    ....
    if (banana != delicious)
    {
        if (apple != delicious)
        {
            if (pear != delicious)
            {
                you = fussy;
            }
        }
    }


    return 0;
}

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For more, see Indent style - Wikipedia, the free encyclopedia