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);
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;
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What is stored in avg after executing the following code?
double avg = 15 + 20;
avg /= 2;
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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;
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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);
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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);
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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));
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What is the issue with the following code?
int num1 = 5;
int num2 = 10;
double ans = num1 / num2;
System.out.print(ans);
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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);
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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);
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Study Notes
Java Variable Manipulations and Output
-
Card 1:
- Initial values:
j = 10,k = 8 - After operations:
jbecomes12,kbecomes20 - Output:
12 20
- Initial values:
-
Card 2:
- Variable
xstarts at0 - Various increments lead to a final value of
4 - Output:
4
- Variable
-
Card 3:
- Variable
numstarts at5 - After applying
num *= 2andnum %= 6, final value is4
- Variable
-
Card 4:
- Given uninitialized variables
xandy,zgets assignedx -
zis changed to(x / y) + 2
- Given uninitialized variables
Floating-point and Integer Operations
-
Card 5:
- Initial sum of
15 + 20results in35 - After division by
2,avgequals to17.5stored in a double variable
- Initial sum of
-
Card 6:
- Initial values:
x = 4,y = 6 - Both
xandyupdate with subtraction and addition, resulting in decreased values
- Initial values:
Casting and Integer Conversion
-
Card 7:
- Difference calculation between
d = 0.25andi = 3yields-2.75 - Final output after casting:
-2.5
- Difference calculation between
-
Card 8:
-
a = 7,bcalculated to be3via explicit casting - Output of
bandcresults in:3 1.5
-
Output through Integer Division
-
Card 9:
-
p = 10.6,n = -0.2 - After rounding, outputs
11and0
-
-
Card 10:
- Division of two integers does not type promote, leading
ansto be0.0 - Suggests casting to double for accurate division result
- Division of two integers does not type promote, leading
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
1/2is0due to integer division, impacted by lack of double casting - Calculation outcome should have considered casting for accurate floating-point representation
- Result of
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Description
Test your understanding of basic Java programming concepts with this set of multiple-choice questions. Focus on variable manipulation, arithmetic operations, and their outputs. Perfect for reinforcing your knowledge before moving on to more advanced topics.
