Failed to read integer using fscanf in c

Question

FILE *fin = fopen("figura.in", "r");
if(fscanf(fin, "%d %d %d %d", &int[0], &int[1], &int[2], &int[3]) == 1)     {
        printf("%d\t%d\t%d\t%d\n", int[0], int[1], int[2], int[3]);
    } else {
        printf("failed to read integer.\n");
    }

I get failed to read integer. The file is okay, it consists 4 integers. What is wrong?

Please don't use `int` for a dummy variable name: it is a **keyword**. I suggest `dummy_int` :) — pmg, Oct 27 '12 at 12:09

score 5 · Accepted Answer · 2012-10-27T12:22:49.870

5

You should be checking to see if fscanf returns 4, the number of inputs in your format string:

if(fscanf(fin, "%d %d %d %d", &arr[0], &arr[1], &arr[2], &arr[3]) == 4)

From the man page:

return the number of input items successfully matched and assigned, which can be fewer than provided for, or even zero in the event of an early matching failure.

edited Oct 27 '12 at 12:22

answered Oct 27 '12 at 12:04

are you sure its &int[0], &int[1].. aren't they "keywords"? – Aniket Inge Oct 27 '12 at 12:09

Failed to read integer using fscanf in c

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