The following syntax diagrams for a particular programming language show the syntax of:
– An assignment statement
– A variable
– An unsigned integer
– A letter
– An operator
– A digit.

a) The following assignment statements are invalid.
Give the reason in each case.
i) C2 = C3 + 123
ii) A3 := B1 – B2
iii) A32 := A2 * 7
b) Copy and complete the Backus-Naur Form (BNF) for the syntax diagrams shown. has been done for you.

c) The definition of is changed to allow:
– One or two letters and
– Zero, one or two digits.
Draw an updated version of the syntax diagram for .

d) The definition of is altered so that its syntax has replaced by .

A real is defined to be:
– At least one digit before a decimal point
– A decimal point
– At least one digit after a decimal point.
Give the BNF for the revised and .

Transcribed Image Text:

Assignment statement Unsigned integer Variable Variable Operator Variable Digit Letter Digit Unsigned integer 2 Digit 3 Letter Operator 4 А В 7 8