Question: 6. What is the weakest precondition for the following assignment statement: x = 2 * ( y - x) + x { x > 10}

6. What is the weakest precondition for the following assignment statement: x = 2 * ( y - x) + x { x > 10}

y > 10

x > 10

2y - x > 10

y - x > 5

7.

The start symbol in a grammar is:

Terminal symbol

Nonterminal symbol

Neither terminal nor nonterminal

Both terminal and nonterminal

8.

What did Chomsky propose?

BNF

Context-free grammars only

EBNF

Four classes of grammars, including context-free grammars

10. Which of the following are nonterminal symbols in the grammar rule:

--> + | - |

+

-

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