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

int i,j; int ctr = 0; int myArray[2][3]; for (i=0; i<3; i++) for (j=0; j<2; j++) { myArray[j][i] = ctr; ++ctr; } What is the value of myArray[1][2]; in the sample code?

  1. 1

  2. 2

  3. 3

  4. 4

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

The loops store ctr values in transposed index order: myArray[j][i] where i is outer (0-2) and j is inner (0-1). After all iterations: myArray[0]=[0,2,4], myArray[1]=[1,3,5]. Therefore myArray[1][2] equals 5. The 2x3 array is filled column-wise due to swapped indices.

Multiple choice

What is the output of the given program?

public class HelloWorld {
 public static void main(String[] args) {
  String s1 = "Welcome to Aliensbrain";
  String s2 = "Welcome to Aliensbrain";
  switch (s1 == s2) {
   default: System.out.println("Bye");
   case 1:
     System.out.println("Hello Italy");
   case 0:
     System.out.println("Hello Paris");
  }
 }
}

  1. Hello ItalyHello Paris

  2. Hello Paris

  3. Bye Hello ItalyHello Paris

  4. Compiler Error

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

This is the correct answer.

Multiple choice

What is the output of the given code?

public class HelloWorld {
 public static void main(String[] args) {
  int i = 128 &lt;&lt; 2 &lt;&lt; 1 &lt;&lt; 0;
  switch (i) {
   default: System.out.println("Bye");
   case 128 &lt;&lt; 4 &lt;&lt; 3 &lt;&lt; 2 &gt;&gt; 6:
     System.out.println("Hello Italy");
   case 128 &lt;&lt; 4 &lt;&lt; 2 &lt;&lt; 2 &gt;&gt; 6:
     System.out.println("Hello Paris");
   case 128 &lt;&lt; 4 &lt;&lt; 4 &lt;&lt; 2 &gt;&gt; 3:
     System.out.println("Hello London");
  }
 }
}

  1. ByeHello ItalyHello ParisHello London

  2. Hello ItalyHello ParisHello London

  3. Hello ParisHello London

  4. Hello London

  5. Compiler error
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct answer.

Multiple choice

What is the output of the given program?

public class Example {
 public static void main(String[] args) {
   String s1 = new String("Welcome to Aliensbrain");
   String s2 = new String("Welcome to Aliensbrain");
   String s3 =  new String("Welcome to Aliensbrain");
   if (s3 == (s1 == s2)) // Line 1 
      System.out.println("Equal");
   else 
      System.out.println("Not Equal");
 }
}

  1. Equal

  2. Not equal

  3. Blank output

  4. Error at line 1

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

This is the correct answer.

Multiple choice

What is the output of the given code?

public class HelloWorld {
 public static void main(String[] args) {
  int i = 128 &lt;&lt; 4 &lt;&lt; 3 &lt;&lt; 2 &gt;&gt; 6;
  switch (i) {
   default: System.out.println("Bye");
   case 65536:
     System.out.println("Hello Italy");
   case 32:
     System.out.println("Hello Paris");
   case 8 / 2:
     System.out.println("Hello London"); //Line 1 
  }
 }
}

  1. Hello ItalyHello ParisHello London

  2. Bye

  3. ByeHello ItalyHello ParisHello London

  4. Hello ParisHello London

  5. Error at line 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer.

Multiple choice

What is the output of the following code snippet?

#include <iostream> using namespace std; int main () { int numbers[5]; int * p; p = numbers; *p = 10; p++; *p = 20;
p = &numbers[2]; *p = 30;
p = numbers + 3; *p = 40;
p = numbers; *(p+4) = 50;
for (int n=0; n<5; n++) cout << numbers[n] << , ; return 0; }

  1. 10, 20, 30

  2. 10, 20, 30, 40

  3. 10, 20, 30, 40, 50

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A very simple concept has been used in this program, i.e. name of array basically contains base address and here we are initializing pointer to base address and then setting and incrementing pointer. Therefore, the correct answer is 10, 20, 30, 40, 50. 

Multiple choice

What is the output of the following C code?

#include<stdio.h> int main() { short int i=0; for(i;++i;i>=99) printf(%d,i); return 0; }

  1. Infinite loop

  2. 1 to 32767 and then from -32768 to -1

  3. Compiler error

  4. Print from 1 to 99
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let Initial value be: i It does not affect any thing in the program. Checking condition: ++i It is incrementing the value of i by one in each iteration.  We know in c, zero means false. When value of i is zero, loop will terminate. Increment value: i >= 99 It is not incrementing the value of variable i.

It is clear, loop will terminate when value of variable i is zero. Hence, printf function will print: 1 to 32767 and then, from -32768 to -1   (range of short int) Hence, this option is correct.