file scan using fscanf with array struct in c

Question

So i wanna know how to use fscanf with array struct. So this is my struct

struct menuinput{
        char nama[50];
        int nomor;
        int berat;
        int jumlah;
        int pilihan;
        float kalori;
        float totalkkal;
    }mknpokok[20],mknsayur[20],mknspsj[20],mknlaukpauk[20],mknbuah[20];

And i wanna use it in file scan using fscanf, as far as i know file scan command is like this

while(!feof(fp))    
{
        fscanf(fp,"\n%d %[^\n] %d %.3f",&mknpokok.nomor[i],mknpokok.nama[i],&mknpokok.berat[i],&mknpokok.kalori[i])
        i++;
}

When i run that i get this error message

error: '(struct menuinput *)&mknpokok' is a pointer; did you mean to use '->'?

I forget how to fscanf with array struct, so is what am i doing is correct? if wrong please correct it with the right code, thank you.

What about the file scan? how to replace `while(!feof(fp)){fgets(stream,sizeof stream,fp);}` with fscanf? @SupportUkraine — LearnerC, Jun 18 '22 at 06:53
@LearnerC Did you try the suggestions in the answers you've gotten? — Ted Lyngmo, Jun 18 '22 at 14:43

score 0 · Answer 1 · answered Jun 18 '22 at 06:49

0

You are accessing the elements of the struct mknpokok in a wrong way.

You should access them like &mknpokok[i].nomor instead of &mknpokok.nomor[i], since you have declared array of mknpokok, not nomor.

answered Jun 18 '22 at 06:49

L_R

170
11

Ted Lyngmo · Answer 2 · 2022-06-18T11:43:37.947

You have placed the subscript operator on the wrong elements. mknpokok is an array of 20 menuinput so use the subscript operator on that, mknpokok[i].
Never use while(!feof(stream)) and then try to read from the stream without checking that reading succeeded. See Why is “while( !feof(file) )” always wrong?
You should always make sure that you don't read more elements than you can fit in your array. Always do bounds checking.
%.3f is not a standard conversion. You should probably use %f.

Example:

//   only populate elements 0-19
//              v
    while (i < 20 && fscanf(fp, " %d %[^\n] %d %f", &mknpokok[i].nomor,
                            mknpokok[i].nama, &mknpokok[i].berat,
                            &mknpokok[i].kalori) == 4) {
//                                               ^^^^
//                                    check that fscanf succeeded
        ++i;
    }

file scan using fscanf with array struct in c

2 Answers2