If programmers create a code using several mathematical operations in Java, how can they specify the part of the expression they want carried out first?

Question

BlackTom AI · Accepted Answer

When programming in Java, the order in which operations are performed can be controlled by grouping parts of an expression with parentheses. This allows you to specify that certain subexpressions should be evaluated first, before the rest of the expression.
Option 1: 'By placing that expression in parentheses modulo, and division are carried out in that order; and then, finally, addition and subtraction are carried out.' This option attempts to describe the use of parentheses to prioritize evaluation order, which aligns with Java's standard operator precedence where parentheses can override default precedence and force a subexpression to be evaluated first. The mention of modulo and division reflects that multiplication, division, and modulo share higher precedence than addition and subtraction, but the key idea remains: parentheses determine the grouping and the evaluation order.
Option 2: 'By placing that expression in double quotation marks' This is incorrect because double quotes denote a string literal in Java. Wrapping code in quotes does not cause it to be evaluated as code, and it cannot influence the runtime order of operations.
Option 3: 'By placing a semicolon immediately after that part of the expression' Semicolons mark the end of a statement. They do not alter the internal evaluation order of the expression, and placing one mid-expression would actually terminate the statement prematurely, leading to a syntax error.
Option 4: 'By placing two forward slashes immediately before that part of the expression' Two forward slashes start a single-line comment. Everything after them on the same line is ignored by the compiler, so this would effectively remove that part from being part of the evaluated expression and does not control evaluation order.
In summary, the mechanism Java provides to control the order of evaluation is parentheses for explicit grouping, with the understanding of the relative precedence of operators (multiplication/division/modulo before addition/subtraction). The other options either misuse syntax or rely on constructs (strings, semicolons, comments) that do not influence how an expression is evaluated.

CSE-110-OD25-27 3.1: Lesson and Knowledge Check - Study Hall Video Episode 3

If programmers create a code using several mathematical operations in Java, how can they specify the part of the expression they want carried out first?

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CSE-110-OD25-27 3.1: Lesson and Knowledge Check - Study Hall Video Episode 3

If programmers create a code using several mathematical operations in Java, how can they specify the part of the expression they want carried out first?

查看解析

登录即可查看完整答案

类似问题

Question at position 10 In the following expression, which will be the second calculation run by MATLAB? X = (2+4)^2*(1+3)/2 ^2(2+4)(1+3)*

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Which operator has the lowest precedence?

Which operator has the lowest precedence?

Consider the following code segment: x = 5 y = 7 z = x - y * 2 After this code segment executes, the value of z is:

The cell containing the formula =5*10-2 > 100/2+2 will evaluate to TRUE.

What will be the value of the following Python expression?print(4 + 3 % 5)

What will be the value of the following Python expression?print(4 + 3 % 5)

更多留学生实用工具

希望你的学习变得更简单

Question at position 10 In the following expression, which will be the second calculation run by MATLAB? X = (2+4)^2(1+3)/2 ^2(2+4)(1+3)