Java Basic

Enter the result

What does this code print?

int n = 0;

System.out.print(++n);

System.out.print(n++);

System.out.print(n++);​

Keep in mind that all numbers are printed on the same line.

Enter the result:

What does the following code print?

int n = 10;

n--;

System.out.println(n++);

Enter the value of result:

int a = 4;

int b = a++;

int c = --a + b++;

int result = ++a - (c++ - b) + c;

Answer explanation

1. a = 4

2. b = a++ that means first we assign a's value to b then increment a, so b = 4 and a = 5

3. c= --a + b++ = 4 + 4 = 8, so final value of a = 4 and b = 5 (As we assign first then increment)

4. 4. res = ++a - (c++ - b) + c = 5 - (8-5) + 9 = 11 (here also first you assign c's value in bracket then increment in the end)

What is the result ?

Given the following code:

int a = -1;

System.out.println(1 - a++);

• 1

• 0

• -1

• 2

• 3

Answer explanation

There are 3 actions here:

• - The first one will be (1 - a). //This will result in 1 - (-1) = 2.

  • - The second will be (a++). //This will increase the value of a by 1, which is (-1)++ will equal to 0.

• - The third will be the sum of the first and the second (2 + 0) = 2.

Such different for loops

Choose all syntatically correct ways to write the for-loop. Remember the difference between syntax rules and coding conventions.

You are unlikely to use some of these methods, but it is important to understand exactly how the for-loop works.

• for (int i = 0; i < 10; i++) { /* body */ }

• int i = 0; for (; i < 10; ++i) { /* body */ }

• for (int k = 10; k > 1; ) { k--; /* some statements */ }

• for (;;) { /* body */ }

The control structure is also known as a

• pre-test loop
• post-test loop
• exit-condition loop
• repetitive conditional statement

The number of loop body executions:

How many times will the loop body be executed?

• 0

• 1

• 2

• 3

• 4

Answer explanation

when counter == 3, if conditional is true and there is no break in it just reassigning the boolean shouldBeStopped to true, then counter++ (it makes counter 4) and when while loop condition is evaluated again

What does this code print?

• 5 4 3 2

• 6 5 4 3 2

• 6 5 4 3

• 5 4 3 2 1

Answer explanation

when i = 3, and perform i -= 2, then i is equal to 1, hence the condition i > 1 will be false -> not loop again

What does this code print?

• 5 4 3 2

• 6 5 4 3 2

• 6 5 4 3

• 5 4 3 2 1

Answer explanation

when i = 3, and perform i -= 2, then i is equal to 1, hence the condition i > 1 will be false -> not loop again

The number of loop body executions:

How many times will the loop body be executed?

• 0

• 1

• 2

• 3

• 4

Answer explanation

when counter == 3, if conditional is true and there is no break in it just reassigning the boolean shouldBeStopped to true, then counter++ (it makes counter 4) and when while loop condition is evaluated again