我的循环无法正常工作（使用feof）

Question

FILE *test;
student st;
int i = 0;
test = fopen("example.bin", "rb");
while (feof(test))
{
    fread(&st, sizeof(st),1,test);
    Class[i] = st;

    i++;
}
fclose(test);

So my question is how to read it, put the data in my structure and stop the loop?

Answer 1

See why is while(feof) always wrong .

Instead, you should loop until you fail to read a student:

while (1 == fread(&st, sizeof st, 1, test))
{
    Class[i++] = st;
}

Also it would be good to make sure you don't overflow the buffer of Class , so put in a check for i too, eg:

for (i = 0; i < MAX_CLASS && 1 == fread(&st, sizeof st, 1, test); ++i)
{
    Class[i] = st;
}