如何在此文件中正确使用fscanf

Question

I have this file with the following contents:

Bob Human, 1

John Cat, 3

Mary Dog, 2

How can I properly use fscanf to have each string and integer in a struct.

typedef struct {
    char name[20];
    char surname[20];
    int code;
} entry;

Then I create an array of _entry_

entry a[3];

How will _a_ get each value properly using fscanf ?

EDIT :

I have tried this:

while(TRUE) {
    nscan=fscanf(infile, "%s %s d%c", temp.name, temp.surname, &temp.code, &termch);
    if(nscan==EOF) break;
    if(nscan!=4 || termch!='\n') {
        printf("Error\n");
    }
    RecBSTInsert(&a, temp);
}

But it seems to pass the last line twice.

Answer 1

You're close, but you're not handling the comma properly.

As usual, it's much easier to read whole lines, then parse them. So let's do that.

Try:

char line[1024];

if(fgets(line, sizeof line, infile) != NULL)
{
  nscan = sscanf(line, "%s %[^,], %d", temp.name, temp.surname, &temp.code);
}

The return value will be 3 if all the fields converted, else you have an error.

Answer 2

#include <stdio.h>

typedef struct{
    char name[20];
    char surname[20];
    int code;
} entry;

int main(){
    entry temp, a[3];
    FILE *infile = fopen("data.txt", "r");
    int i=0, n;
    while(fscanf(infile, "%19s %19[^,], %d", temp.name, temp.surname, &temp.code)==3){
        a[i++] = temp;
        if(i==3)break;
    }
    fclose(infile);
    n = i;
    for(i=0;i<n;++i){
        printf("%s %s, %d\n", a[i].name, a[i].surname, a[i].code);
    }
    return 0;
}