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while (1)
{
fscanf(.....)
...
if (feof(cad)) break;
}

No.

You don't really want to do all the "..." if fscanf() put cad into EOF state, such that...

Either method like breaking a string apart or just using fscanf should work. Your code has two problems that both must be fixed: first, your using feof() wrongly as this page explains.

Secondly,...