Getting integers from .txt file and perfoming actions on them in c

Question

I have a program in C that changes a decimal number into a binary.

int main()
{
  int n, c, k;

  printf("Enter an integer\n");
  scanf("%d", &n);

  printf("%d in binary is:\n", n);

  for (c = 31; c >= 0; c--)
  {
    k = n >> c;

    if (k & 1)
      printf("1");
    else
      printf("0");
  }

  printf("\n");

  return 0;

}

It takes data from what I write in terminal but I would like it to get the data from integers.txt file, which is something like this:

101
34
-11
1,5
lorem ipsum
33.33333
10022

The program should get the integers from the txt file and perform an action to change them into the binary, and at the same time should warn that 1,5 or lorem ipsum are not integers, should not perfom the action on them but should continue to convert other integers. And I'm a bit stuck on how to properly get integers from .txt file and process convert action on them.

Read the text file line by line with `fgets` and then you can examine the content of each line, perhaps using `sscanf` to get the integer. — Weather Vane, Mar 16 '17 at 12:08
Note: For fun , I looked up [lorem ipsum](https://en.wikipedia.org/wiki/Lorem_ipsum). — chux - Reinstate Monica, Mar 16 '17 at 13:19
[Sample code](http://stackoverflow.com/a/23189599/2410359) to read a line with `fgets()` and then parse it. I am sure there are many similar SO posts. — chux - Reinstate Monica, Mar 16 '17 at 13:23

score 0 · Answer 1 · answered Mar 16 '17 at 13:23

You need to search concepts like file pointer and fopen. Those fopen has modes that lets you manipulate files for whatever mode you want(append,write,read) and their + forms .Also search for command arguments for inputing them via terminal. Pearson C is a good book for guide

Getting integers from .txt file and perfoming actions on them in c

1 Answers1