how would i be able to print the identifier and the integer like the others ones in the picture below. Could you help with this?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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how would i be able to print the identifier and the integer like the others ones in the picture below. Could you help with this?

The image displays a snippet of pseudocode, resembling a conditional loop structure, commonly used in computer programming. Here's a transcription of the code:

```
read KEY_READ
IDENT
while KEY_WHILE
IDENT
<= LEQUAL_OP
INT_LIT
do KEY_DO
{ LEFT_CBRACE
write KEY_WRITE
IDENT
IDENT
== ASSIGN_OP
IDENT
+ ADD_OP
INT_LIT
} RIGHT_CBRACE
}
```

### Explanation for an Educational Context:

1. **Keywords and Symbols**:
   - **KEY_READ**: Represents an operation to read input.
   - **IDENT**: Indicates an identifier, which could be a variable name.
   - **KEY_WHILE**: Signifies the start of a while loop.
   - **LEQUAL_OP**: Represents the less than or equal to comparison operator (`<=`).
   - **INT_LIT**: Denotes an integer literal, a hard-coded integer value.
   - **KEY_DO**: Used to introduce the block of code executed by the loop.
   - **LEFT_CBRACE and RIGHT_CBRACE**: Symbols `{` and `}` are used to group statements.

2. **Operations**:
   - **Assignment (ASSIGN_OP)**: Represents the `==` operator, which should be the assignment operator `=` in standard code.
   - **Addition (ADD_OP)**: Symbolizes the addition operation (`+`).

3. **Program Structure**:
   - **Read Operation**: The program starts by reading a value into an identifier.
   - **While Loop**: Continues execution as long as a condition is met.
   - **Loop Block**: Contains actions to execute during each iteration, including writing output and performing arithmetic operations.

This pseudocode illustrates basic control structures and operations found in many programming languages. It's a useful tool for understanding logic flow and algorithm development.
Transcribed Image Text:The image displays a snippet of pseudocode, resembling a conditional loop structure, commonly used in computer programming. Here's a transcription of the code: ``` read KEY_READ IDENT while KEY_WHILE IDENT <= LEQUAL_OP INT_LIT do KEY_DO { LEFT_CBRACE write KEY_WRITE IDENT IDENT == ASSIGN_OP IDENT + ADD_OP INT_LIT } RIGHT_CBRACE } ``` ### Explanation for an Educational Context: 1. **Keywords and Symbols**: - **KEY_READ**: Represents an operation to read input. - **IDENT**: Indicates an identifier, which could be a variable name. - **KEY_WHILE**: Signifies the start of a while loop. - **LEQUAL_OP**: Represents the less than or equal to comparison operator (`<=`). - **INT_LIT**: Denotes an integer literal, a hard-coded integer value. - **KEY_DO**: Used to introduce the block of code executed by the loop. - **LEFT_CBRACE and RIGHT_CBRACE**: Symbols `{` and `}` are used to group statements. 2. **Operations**: - **Assignment (ASSIGN_OP)**: Represents the `==` operator, which should be the assignment operator `=` in standard code. - **Addition (ADD_OP)**: Symbolizes the addition operation (`+`). 3. **Program Structure**: - **Read Operation**: The program starts by reading a value into an identifier. - **While Loop**: Continues execution as long as a condition is met. - **Loop Block**: Contains actions to execute during each iteration, including writing output and performing arithmetic operations. This pseudocode illustrates basic control structures and operations found in many programming languages. It's a useful tool for understanding logic flow and algorithm development.
Expert Solution
Step 1: Algorithm of the program:

Algorithm:

  1. Read tokens from an input file.
  2. For each token:
  3. a. Check if it's an identifier (IDENT) by testing if it contains only alphabetic characters.
  4. b. If it's an identifier, classify it as "IDENT."
  5. c. Check if it's an integer (INT) by attempting to convert it to an integer.
  6. d. If it's an integer, classify it as "INT."
  7. e. Print the type and lexeme of the token.
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