Copy double data from a text file into an array in C

Question

I have a text file of 257 points like this

and I would like to read this data and copy them into an array. With the help of similar answered question I wrote this:

#include<stdio.h>
#include<stdlib.h>

int max_read = 258;
double phi[max_read];
FILE *stream;
stream = fopen("namefile.txt", "r");

if (stream == NULL) {
  print ("! Cannot open file %sn", "namefile.txt\n"); 
  exit(1);
} else{
  int m = 0;
  while(m<max_read) {
    phi[m] = // But I still don't know how write the correct value into the array. 
    m++;
  }
}

I also would like to do this reading-coping procedure until the end of file.

Do you know about scanf? Do you know there is a fscanf to read from a FILE *? — Some programmer dude
– Some programmer dude, Commented Nov 30, 2018 at 11:19

Alexander Vandenberghe · Accepted Answer · 2018-11-30 11:27:20Z

4

This should do the trick i think.

if (stream == NULL) {
    fprint("! Cannot open file %sn", "namefile.txt\n");
    exit(1);
} else{
    int m = 0;
    while (fscanf(stream, "%lf\n", &phi[m])){
        m++;
    }
}

answered Nov 30, 2018 at 11:27

Alexander Vandenberghe

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