Question

A program should compute two times x. Which statement has a logic error?

A. y=x+x;
B. y=2*x;
C. y=x∗2;
D. y=x∗x;

Answer 1

Statement D, y=x*x,

has a logic error because it calculates the square of x instead of two times x.

Step-by-step explanation:

The statement that has a logic error is D. y=x*x.

The reason is that this statement is calculating the square of x, not two times x. To compute two times x, you need to use multiplication or addition. A correct statement would be y=2*x.

For example, if x is equal to 3, the correct statement would give you a value of y equal to 6: y=2*3=6.

The statement with a logic error when a program should compute two times x is D. y=x*x. This is because the operation being performed here is multiplication of x by itself, which will give the result of x squared, not x multiplied by 2. The rest of the statements, A. y=x+x, B. y=2*x, and C. y=x*2, are all correct expressions to compute two times x.