Mixed types in expressions 
| ID | STAT-7 |
| Title | Do not use multiple operand types per operator. |
| Priority | Mandatory |
| Severity level | 3 |
| Description | Do not use multiple operand types per operator. For example, do not mix logical and numerical operands with a multiplication operator. |
| Rationale | Mixing operand types per operator can cause unexpected results and may lead to errors in case of true incompatibilities. |
Avoid:
d = a * b && c;
Instead use:
d = (a * b > 0) && c;