Consider the following code segment:

x = 5
y = 7
z = x - y * 2

After this code segment executes, the value of z is:

Question

Consider the following code segment:

x = 5
y = 7
z = x - y * 2

After this code segment executes, the value of z is:

BlackTom AI · Accepted Answer

To evaluate the expression correctly, we need to follow the standard order of operations: multiplication before subtraction.
Option 1: 5. This would imply either ignoring the multiplication or misplacing the operation, which is not consistent with x - y * 2 since y * 2 equals 14, not 0 or 5.
Option 2: 7. This would suggest adding or subtracting something that cancels out the 7, but the expression x - y * 2 cannot yield 7 given x = 5 and y = 7 when applying multiplication first.
Option 3: -9. Here’s why it’s correct: compute y * 2 = 7 * 2 = 14, then subtract from x: x - 14 = 5 - 14 = -9. This follows the proper arithmetic rule and the given values.
Option 4: -4. This could arise if you incorrectly did (x - y) * 2 = (5 - 7) * 2 = (-2) * 2 = -4, which is a violation of the standard precedence rules. It demonstrates a common mistake of applying subtraction before multiplication.

Fal25_CS003C_74229 Ch. 2 Pre-Quiz (Remotely Proctored)

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

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Fal25_CS003C_74229 Ch. 2 Pre-Quiz (Remotely Proctored)

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

View Explanation

Log in for full answers

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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?

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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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Making Your Study Simpler

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)