Java MULTIPLE CHOICE. Choose the one alternative that best completes the stateme

Question

Java

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question

20) What is 1.0+ 1.0+ 1.0+ 1.0+ 1.0== 5.0? 20) A) true B) false C) There is no guarantee that 1.0+ 1.0+ 1.0+ 1.0+ 1.0== 5.0 is true.
21) Analyze the following code.
boolean even= false; if (even) { System.out.println("It is even!"); }
21)
A) The code is wrong. You should replace if (even) with if (even = true) B) The code displays nothing. C) The code is wrong. You should replace if (even) with if (even == true) D) The code displays It is even!
22) Analyze the following fragment:
double sum= 0; double d= 0; while (d != 10.0) { d+= 0.1; sum += sum + d; }
22)
A) The program does not compile because sum and d are declared double, but assigned with integer value 0. B) The program never stops because d is always 0.1 inside the loop. C) After the loop, sum is 0 + 0.1+ 0.2+ 0.3+ ... + 1.9 D) The program may not stop because of the phenomenon referred to as numerical inaccuracy for operating with floating-point numbers.
23) Which of these data types requires the most amount of memory? 23) A) byte B) int C) long D) short
4
24) What is y after the following statement is executed?
x= 0; y= (x > 0) ? 10 :-10;
24)
A) 0 B) 20 C) -10 D) 10 E) Illegal expression
25) How many times will the following code print "Welcome to Java"?
int count= 0; do { System.out.println("Welcome to Java"); } while (count++ < 10);
25)
A) 8 B) 11 C) 10 D) 0 E) 9

Explanation / Answer

20)A)true

21)B)The code displays nothing

because we defined even variable as false.whenever if gets executed it checks for true condition but even=false

so,if not executed.

22)D)The program may not stop because of the phenomenon referred to as numerical inaccuracy for operating with floating-point numbers.

it goes to infinite loop

23)c)long

24)c)-10

because x=0 it is not greater than 0 so condition failed.so,y takes value -10

25)B)11

Because of do while loop it gets executed one more time before it's value checked by while condition.

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