Computer Knowledge

Programming Output Evaluation

1,953 Questions

Programming output evaluation tests the ability to trace code execution in languages like C, Java, and SAS. It focuses on arrays, loops, pointers, and data type conversions. These technical questions are standard in computer knowledge sections for IT officer and bank exams.

Java string bufferC language pointersLoop execution outputsData type conversionsMacro variable evaluation

Programming Output Evaluation Questions

Multiple choice

What is the output of the given java program?

public class HelloWorld
{
public static void main(String []args)
{
int i = (1048576>>8>>3>>8>>3) + + - + (1024<<8<<3>>8>>3);
switch(i) // Line 1
{
default : System.out.println("Good Bye");
case 1024 : System.out.println(1024<<8<<3>>8>>3);
case 512 : System.out.println(1024<<2>>3<<2);
case 1 : System.out.println(1024<<3<<8>>3>>3);
}
}
}

  1. Good Bye 1024 2048 32768

  2. 1024 2048 32768

  3. 2048 32768

  4. 32768

  5. Compilation error
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct choice, the value of variable i after evaluating the expression (1048576>>8>>3>>8>>3) + + - + (1024<<8<<3>>8>>3) comes out to be -1024.The expression is evaluated as following :-(1024*(2^8)(2^3)) / ((2^8)/(2^3)) - (1024(2^8)*(2^3)) / ((2^8)/(2^3)) = -1024. So, the switch statement becomes switch(-1024), bu there is no case label having label -1024, so the default case will be executed until a break keyword is found.So the output is: Good Bye 1024 2048 32768.So this answer is true.

Multiple choice

What is the output of the given java program?

public class HelloWorld
{
public static void main(String []args)
{
int i= (int)Math.round(Math.hypot(114,123));
switch(i) // Line 1 { default : System.out.println("Default Case");
 case 128<<6<<3 : System.out.println("Case 1");
 case 9072/54 : System.out.
println("Case 2"); case 128<<4<<2 :
 System.out.println("Case 3");
 }
 }
 }

  1. Default CaseCase 1Case 2Case 3

  2. Case 1Case 2Case 3

  3. Case 2Case 3

  4. Case 3

  5. Compilation Error
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct choice. The hypot() method in java takes two arguments as hypot(x,y) and it evaluates the expression :- sqrt(x^2 + y^2).So this will find sqrt(5,8) which comes out to be 167.7, so now the round() function will convert it to the nearest integer value, which is 168.We have converted the “long” value 168 into integer and passed it to switch case.Now swtich() case becomes switch(168), now the case label having value 168 will be executed.So the case 2 gets executed and printed “Case 2”, but there is no break keyword after case 2, so case 3 also gets executed. So, the correct output becomes:-Case 2Case 3.

Multiple choice

What is the output of the given java program?

public class HelloWorld
{
 public static
void main(String []args)
{
 int i = (1048576>>8>>3>>8>>3) + + - + (1024<<8<<3>>8>>3);
 switch(i++) // Line 1 { case 1024 : System.out.
println("Hello"); case 1025 : System.out.
println("How r u?"); case 512 : System.out.
println("Bye"); case 513 : System.out.
println("Bye Bye"); default : System.out.
println("Good Bye");
 }
 }
 }

  1. HelloHow r u?Bye Bye ByeGood Bye

  2. How r u? Bye Bye Bye Good Bye

  3. Bye Bye ByeGood Bye

  4. Bye ByeGood Bye

  5. Good Bye
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct choice, the value of variable i after evaluating the expression (1048576>>8>>3>>8>>3) + + - + (1024<<8<<3>>8>>3) comes out to be -1024.The expression is evaluated as following :-(1024*(2^8)(2^3)) / ((2^8)/(2^3)) - (1024(2^8)*(2^3)) / ((2^8)/(2^3)) = -1024.So the switch statement becomes(i++), as we have used post-increment on Variable i, so the value of variable i is still -1024. So the switch statement becomes switch(-1024), but there is no case label having label -1024, so the default case will be executed until a break keyword is found. So the output is :-Good Bye

Multiple choice

What is the output of the given java program?

public class HelloWorld
{
public static void main(String []args)
{
int i = 1024<<8<<3>>8>>3;
switch(i)
{
default : break;
case 1048576/(34*32) : System.out.println("Case 1");
case 1073741824/(2*32*4*32*16*8*2) : System.out.println("Case 2");
case 1048576/(32*30*4) : System.out.println("Case 3");
}
}
}

  1. Case 1Case 2Case 3

  2. Case 2 Case 3

  3. Case 3

  4. No output

  5. Compiler Error
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct, no output will be printed on the screen. The expression (int i = 1024<<8<<3>>8>>3;) given in theCode Evaluates to 1024. So the value of variable i is 1024. The expression will be evaluated as :-(1024*(2^8)*(2^3)) / ((2^8)/(2^3)). So the value of the variable I is now 1024.Now switch will find a case having value 1024, but there is no case label having value 1024.So the Default case will be executed, but there is no statement in the Default case. So no output will be printed on the screen. So this answer is correct.

Multiple choice

What is the output of the given java code?

public class HelloWorld
{
 public static
void main(String []args)
{
 int i=1;
 if(i) switch(i++)
// Line 1 { default : System.out.println("No Value");
 case 0 : System.out.
println("i is 0");
 case 1 : System.out.
println("i is 1");
 case 2 : System.out.
println("i is 2");
 }
 }

  1. Valuei is 0i is 1i is 2

  2. i is 0i is 1i is 2

  3. i is 1i is 2

  4. i is 2

  5. Compilation Error
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct choice, there is an error in the code. We have declared variable i of integer type, and we are passing i into the if() statement.If() requires a Boolean type variable and we are passing an integer value to it. So the compiler will raise an error. So this answer is correct.

Multiple choice

What will be the result of the above code? String s = �Welcome To Java�;

s.charAt(s.length());

  1. a

  2. v

  3. Compiler Error : canoot pass a function as parameter

  4. Compiler Error : parameters not sufficient

  5. Compiler Error : parameters not sufficient
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. S.length() wil return 15 because there are 15 characters in the String. So the code looks like this :-s.charAt(15);the index count starts at 0. In this way the last character a is at index number 14. So if we try to access a character in a string which is out of bound then a runtime exception “StringOutOfBound” will be thrown. So we can pass only till s.charAt(s.length()-1). So this is correct answer.

Multiple choice

What will be the result of the above code? String s = �Welcome To Java�

s.substring(4 , 3 );

  1. ome
    • 1

  3. com

  4. Run time error

  5. Compile time error
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. Substring method takes two parameters (beginIndex,EndIndex).Substring( int Begin , int End). It return the string from begin to end – 1. But if the begin index is greater than the endindex then a runtime error will occur. So here substring(4,3) will give runtime error. So this is the correct answer.

Multiple choice

What will be the output of the given piece of code?

String s = �Welcome To Java�;

String s1 = �Java�;

s.match(s1);

  1. true

  2. false
    • 1

  4. Compile time error

  5. Run time error
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. The compiler will throw an error that method match() was not declared. Because String class do not contains any method named match(). The correct method is matches(). So the above statement should be s.matches(s1). So this is the correct answer.