// citire
FILE *f;

f = fopen("operatii.in", "r");

if (!f)
    exit(1);

char op[16];
int n;

while(fscanf(f, "%s %d", &op, &n) == 2 || fscanf(f, "%s", op) == 1)
{
    if (!strcmp(op, "del"))
        del(...);

    else if (!strcmp(op, "move"))
        move(...);

    // ...
}