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Chapter 1: Problem 10

Describe the difference between a program line and a statement.

Short Answer

Expert verified
Answer: A program line refers to a single line in the source code of a computer program, while a statement is a complete instruction that performs an action or serves a specific purpose in the program. A program line might contain part of a statement, a complete statement, or multiple statements depending on the programming language and style used. On the other hand, a statement usually consists of one or more program lines but must be syntactically and logically complete for the programming language used.

Step by step solution

01

Definition of a Program Line

A program line is a single line in the source code of a computer program. It might contain part of a statement, a complete statement, or multiple statements, depending on the programming language and style used. Program lines are typically numbered or structured by indentation for easier readability and to help with debugging.
02

Definition of a Statement

A statement is a complete instruction in a computer program that performs an action or serves a specific purpose. It usually consists of one or more program lines but must be syntactically and logically complete for the programming language used. Statements are the building blocks of a program and are executed one after the other during runtime, unless control structures like loops or conditional statements modify the execution order.
03

Example of a Program Line and a Statement

Let's consider a simple example in Python: ``` x = 5 y = x + 3 print(y) ``` In this example, there are three program lines, each containing one statement: 1. `x = 5`: A statement that assigns the value of 5 to the variable `x`. 2. `y = x + 3`: A statement that assigns the result of `x + 3` to the variable `y`. 3. `print(y)`: A statement that prints the value of `y`. However, in some programming languages, it would be possible to write multiple statements in a single program line, for example: ``` x = 5; y = x + 3; print(y) ``` In this case, there is only one program line, but it contains three statements.

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