Question

I’m wanting to load a known number of numbers into an array in C from a text file (.txt). The format would be:

“0,1,2,5,4”

I’m kinda new to C, can anyone recommend a way to load in the text file?

Cheers

Answer 1

It can be done easily with fscanf:

#include <stdio.h>
int main()
{
    FILE* f = fopen("test.txt", "r");
    int number = 0;
    int sum = 0; /* the sum of numbers in the file */

    while( fscanf(f, "%d,", &number) > 0 ) // parse %d followed by ','
    {
        sum += number; // instead of sum you could put your numbers in an array
    }

    fclose(f);
}

---

@pmg: Sure, why not. I just though if it is a hw, then it is a bad thing to give a complete solution 🙂

#include <stdio.h>
int main()
{
    FILE* f = fopen("test.txt", "r");
    int n = 0, i = 0;
    int numbers[5]; // assuming there are only 5 numbers in the file

    while( fscanf(f, "%d,", &n) > 0 ) // parse %d followed by ','
    {
        numbers[i++] = n;
    }

    fclose(f);
}