# V661. Suspicious expression 'A[B < C]'. Probably meant 'A[B] < C'.

The analyzer has detected a suspicious code fragment where an array item is being accessed. A logical expression is used as an array index.

Here are examples of such expressions: Array[A >= B], Array[A != B]. Perhaps the closing square bracket is in the wrong place. These errors usually occur through misprints.

Consider an example of incorrect code:

    if ((bs->inventory[INVENTORY_ROCKETLAUNCHER] <= 0 ||
         bs->inventory[INVENTORY_ROCKETS < 10]) && <<== ERROR!
        (bs->inventory[INVENTORY_RAILGUN] <= 0 ||
         bs->inventory[INVENTORY_SLUGS] < 10)) {
            return qfalse;
    }

This code is compilable but works incorrectly. It's highly probable that the following text should be written instead:

    if ((bs->inventory[INVENTORY_ROCKETLAUNCHER] <= 0 ||
         bs->inventory[INVENTORY_ROCKETS] < 10) &&
        (bs->inventory[INVENTORY_RAILGUN] <= 0 ||
         bs->inventory[INVENTORY_SLUGS] < 10)) {
            return qfalse;
    }

Note. The analyzer doesn't generate the warning all the time a logical expression is placed inside square brackets. It is sometimes justified. For instance, such an exception is the case when an array consists of only two items:

    int A[2];
    A[x != y] = 1;

You can look at examples of errors detected by the V661 diagnostic.