Unit 1 Progress Check: MCQ Part B

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Questions and Answers

What will be the output of the following code?

int j = 10;
int k = 8;
j += 2;
k += j;
System.out.print(j);
System.out.print(" ");
System.out.println(k);

  • 10 20
  • 12 18
  • 12 20 (correct)
  • 10 18

What is the output of the following code?

int x = 0;
x++;
x += 1;
x = x + 1;
x -= -1;
System.out.println(x);

4

What is the final value of num after the following code?

int num = 5;
num *= 2;
num %= 6;

4

What does the following code set z to?

int x = ;
int y = ;
int z = x;
z /= y;
z += 2;

<p>It sets z to (x / y) + 2.</p> Signup and view all the answers

What is stored in avg after executing the following code?

double avg = 15 + 20;
avg /= 2;

<p>17.5</p> Signup and view all the answers

Both the value of x and the value of y have been increased in the following code:

int x = 4;
int y = 6;
x -= y;
y += x;

<p>False (B)</p> Signup and view all the answers

What is the output of the following code?

double d = 0.25;
int i = 3;
double diff = d - i;
System.out.print((int)diff - 0.5);

<p>-2.5</p> Signup and view all the answers

What will be the output of the following code?

double a = 7;
int b = (int) (a / 2);
double c = (double) b / 2;
System.out.print(b);
System.out.print(" ");
System.out.print(c);

<p>3 1.5</p> Signup and view all the answers

What will the following code output?

double p = 10.6;
double n = -0.2;
System.out.println((int) (p + 0.5));
System.out.print((int) (n - 0.5));

<p>11 0</p> Signup and view all the answers

What is the issue with the following code?

int num1 = 5;
int num2 = 10;
double ans = num1 / num2;
System.out.print(ans);

<p>The code should have cast either num1 or num2 in the expression num1 / num2 to double.</p> Signup and view all the answers

Does the following code segment work as intended?

double len1;
double len2;
double len3;
double total = len1 + len2 + len3;
int minLength = (int) (total + 0.5);
System.out.print(minLength);

<p>Yes, but only under certain conditions.</p> Signup and view all the answers

What should be done in the following code to get the expected output?

double fact1 = 1 / 2;
double fact2 = 3 * 4;
double product = fact1 * fact2;
System.out.println(product);

<p>Either the numerator or the denominator of the fraction 1 / 2 should be cast as double.</p> Signup and view all the answers

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Study Notes

Java Variable Manipulations and Output

  • Card 1:

    • Initial values: j = 10, k = 8
    • After operations: j becomes 12, k becomes 20
    • Output: 12 20
  • Card 2:

    • Variable x starts at 0
    • Various increments lead to a final value of 4
    • Output: 4
  • Card 3:

    • Variable num starts at 5
    • After applying num *= 2 and num %= 6, final value is 4
  • Card 4:

    • Given uninitialized variables x and y, z gets assigned x
    • z is changed to (x / y) + 2

Floating-point and Integer Operations

  • Card 5:

    • Initial sum of 15 + 20 results in 35
    • After division by 2, avg equals to 17.5 stored in a double variable
  • Card 6:

    • Initial values: x = 4, y = 6
    • Both x and y update with subtraction and addition, resulting in decreased values

Casting and Integer Conversion

  • Card 7:

    • Difference calculation between d = 0.25 and i = 3 yields -2.75
    • Final output after casting: -2.5
  • Card 8:

    • a = 7, b calculated to be 3 via explicit casting
    • Output of b and c results in: 3 1.5

Output through Integer Division

  • Card 9:

    • p = 10.6, n = -0.2
    • After rounding, outputs 11 and 0
  • Card 10:

    • Division of two integers does not type promote, leading ans to be 0.0
    • Suggests casting to double for accurate division result

Length Summation and Rounding

  • Card 11:
    • Total length calculated from three doubles
    • Casting to integer with rounding rules only works correctly under specific conditions

Fraction Operations and Cast Requirements

  • Card 12:
    • Result of 1/2 is 0 due to integer division, impacted by lack of double casting
    • Calculation outcome should have considered casting for accurate floating-point representation

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