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Select one: def f(x1, yl, x2, y2): s = x1 * x2 + y1 * y2 O a. return s def f(x1, y1, х2, у2): print("x1*x2+y1*y2") Ob. def f(xl, yl, x2, y2): s %3D x1 * х2 + y1 * у2 print(s) def f(x1, yl, x2, y2): print(x1 * x2 + yl * y2) Od. return

Select one: def f(x1, yl, x2, y2): s = x1 * x2 + y1 * y2 O a. return s def f(x1, y1, х2, у2): print("x1*x2+y1*y2") Ob. def f(xl, yl, x2, y2): s %3D x1 * х2 + y1 * у2 print(s) def f(x1, yl, x2, y2): print(x1 * x2 + yl * y2) Od. return

Database System Concepts
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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### Understanding Expressions and Commands in Programming An **expression** is an instruction that evaluates to a value. For example, `x+2`, `grade > 60`, and `name[0]` are expressions as they evaluate to a number, a Boolean value, and a string, respectively. A **command** is an instruction that performs an action from which we do not expect a value to be produced; for example, `print('Hello')`. #### Which of the following functions can be used in an expression? Select one: - **a.** ```python def f(x1, y1, x2, y2): s = x1 * x2 + y1 * y2 return s ``` - **b.** ```python def f(x1, y1, x2, y2): print("x1*x2+y1*y2") ``` - **c.** ```python def f(x1, y1, x2, y2): s = x1 * x2 + y1 * y2 print(s) ``` - **d.** ```python def f(x1, y1, x2, y2): print(x1 * x2 + y1 * y2) return ``` **Explanation:** - Option **a** defines a function `f()` that takes in four parameters. It calculates the value of `s` by performing the specified arithmetic operation and then returns `s`. This function can be used in an expression because it produces a value by returning `s`. - Option **b** defines a function `f()` that prints a string representing the arithmetic expression in quotes. Since this function does not return a value, it cannot be used in an expression. - Option **c** defines a function `f()` that performs the same arithmetic operation as in option **a** and stores it in `s`, but instead of returning `s`, it prints it. Since the function does not return a value, it cannot be used in an expression. - Option **d** defines a function `f()` that prints the result of the arithmetic operation directly and then returns nothing explicitly (equivalent to returning `None`). This function cannot be used in an expression because the return value is `None`. Thus, the correct answer is:
Transcribed Image Text:### Understanding Expressions and Commands in Programming An **expression** is an instruction that evaluates to a value. For example, `x+2`, `grade > 60`, and `name[0]` are expressions as they evaluate to a number, a Boolean value, and a string, respectively. A **command** is an instruction that performs an action from which we do not expect a value to be produced; for example, `print('Hello')`. #### Which of the following functions can be used in an expression? Select one: - **a.** ```python def f(x1, y1, x2, y2): s = x1 * x2 + y1 * y2 return s ``` - **b.** ```python def f(x1, y1, x2, y2): print("x1*x2+y1*y2") ``` - **c.** ```python def f(x1, y1, x2, y2): s = x1 * x2 + y1 * y2 print(s) ``` - **d.** ```python def f(x1, y1, x2, y2): print(x1 * x2 + y1 * y2) return ``` **Explanation:** - Option **a** defines a function `f()` that takes in four parameters. It calculates the value of `s` by performing the specified arithmetic operation and then returns `s`. This function can be used in an expression because it produces a value by returning `s`. - Option **b** defines a function `f()` that prints a string representing the arithmetic expression in quotes. Since this function does not return a value, it cannot be used in an expression. - Option **c** defines a function `f()` that performs the same arithmetic operation as in option **a** and stores it in `s`, but instead of returning `s`, it prints it. Since the function does not return a value, it cannot be used in an expression. - Option **d** defines a function `f()` that prints the result of the arithmetic operation directly and then returns nothing explicitly (equivalent to returning `None`). This function cannot be used in an expression because the return value is `None`. Thus, the correct answer is:
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