Question

I want a function that reads in a file and returns the sum of ascii values. I have looked at this page:

How to open a file and find the longest length of a line and then print it out

and the answer to my question was probably starring me in the face, but I cant follow the code enough to make it work for me. Also if you could tell me how to look for the functions I want instead of having to ask on here that would be cool. Thank you.

Or is this something I need to build?
Current code:

#include <stdio.h> 

#include <stdlib.h>

double get_number(int num);

main ()
 {

     double n1,n2,n3;
     double average;

      printf("\nCompute the ascii average of 3 files\n");
      printf("--------------------------------\n");
      n1 = get_number(1);
      n2 = get_number(2);
      n3 = get_number(3);
      average = (n1 + n2 + n3)/3;
      printf("The average is %0.2f\n",average);
}

    double get_number(int num) { 
      double value = 0;
      int c;
      printf("Please input entry %i: ", num);
      while ((c = getchar()) != EOF) {
    value = value + (c);
      }

  return(value);
  }

Answer 1

There is no pre-built function in the Standard library to do it. You have to code it yourself or rely on some other library.

THe functions available in the Standard library are described in several places over the ‘net and in lots of books, but you have to know what you are looking for in the first place.
Start with a beginner’s book and go from there.