1. An arithmetic operation between integer and an integer gives integer as the result.
2. An arithmetic operation between a real and a real constant gives real constant as the result.
3. An arithmetic operation between an integer constant and a real constant is not valid.

Match the following:

1. It can have alphabets, digits or underscores but no other special character.
2. The maximum number of characters is 8.
3. The first character may be an alphabet or digit but not underscore.

1. simple circuitry
2. ability to track and scan simultaneously
3. ability to track many targets together
4. very fast scanning