Modifying the grammar based on Figure 2.25: In Figure 2.25, they used LR grammar to obtain a realistic example. Figure 2.25 uses a left recursive production for stmt_list. Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end. It also uses left recursive productions for expr and term. These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side. The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25. program → other_stmt_list write expr stmt_list $$ other_stmt_list → other_stmt_list other_stmt | ∈ other_stmt → id := expr | read id stmt_list → stmt_list stmt |

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Answer 1

Expert Solution & Answer

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

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Answer 2

Expert Solution & Answer

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

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Answer 3

Expert Solution & Answer

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

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Answer 4

Expert Solution & Answer

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

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Answer 5

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Answer 6

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Answer 7

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

Answer 8

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Answer 9

Chapter 4, Problem 2E

Explanation of Solution

Modifying the grammar based on Figure 2.25:

In Figure 2.25, they used LR grammar to obtain a realistic example.

Figure 2.25 uses a left recursive production for stmt_list.

Using left recursion allows the parser to break the long statement lists as it goes along, rather than waiting until the entire list is on the stack and then break it from the end.

It also uses left recursive productions for expr and term.

These two productions captured using left associativity while keeping an operator and its operands together in the same right-hand side.

The following grammar shows the use of at least one write statement with grammar provided in Figure 2.25.

program→other_stmt_list write expr stmt_list $$other_stmt_list→other_stmt_list other_stmt | ∈other_stmt→id := expr | read idstmt_list→stmt_list stmt |

Answer 10

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

Answer 11

Explanation of Solution

Modifying the grammar based on Example 2.17:

The Example 2.17 shows the recursive descent parser.

In this method, the execution starts in procedure program. And then the recursive calls are traced out to form a traversal of the parse tree.

program → other_stmt_list writing_stmt stmt_list $$other_stmt_list → other_stmt_list other_stmt | ∈other_stmt → id := expr | read id | if condition then other_stmt_list fi | while condition do other_stmt_list odwriting_stmt → write expr | if condition then other_stmt_list writing_stmt stmt_list fi | while condition do other_stmt_list writing_

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 4.3 - Prob. 1CYU Ch. 4.3 - Prob. 2CYU Ch. 4.3 - Prob. 3CYU Ch. 4.3 - Prob. 4CYU Ch. 4.3 - Prob. 5CYU Ch. 4.3 - Prob. 6CYU Ch. 4.3 - Prob. 7CYU Ch. 4.3 - Prob. 8CYU Ch. 4.3 - Prob. 9CYU Ch. 4.6 - Prob. 10CYU

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