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 will be the output of the following program? using System; class Program { static void Main(string[] args) { String[] s = new String[2]; s[0] = Hello; s[1] = How are you!; foreach (string name: s) { Console.WriteLine( + name); } Console.ReadLine(); } }

  1. HelloHow are you

  2. Hello

  3. It will not compile

  4. It will give exception

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

The code will not compile as there is an error in the syntax of foreach loop, there should be foreach (string name in s) instead of foreach (string name: s).

Multiple choice

What will be the output of the following code? using System;class A { public void DemoA() { Console.WriteLine(Method of class A); } } class B : A { public void DemoB() { Console.WriteLine(Method of class B); } } class Test { static void Main (string[] args) { A a=new B(); a.DemoA(); a.DemoB(); } }

  1. Method of class AMethod of class B

  2. Method of class BMethod of class B

  3. Method of class AMethod of class A

  4. Compilation error

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The code will not compile as we have an object of type B but base class A does not have the definition of method DemoB of the B class. Hence a.DemoB() is illegal but a.DemoA() is legal.

Multiple choice

What is the error in the following code, if any? using System;class Demo { private string name; public void print() { Console.WriteLine(nMy name is + name); } public string Name { get { return name; } set { name = value; } } class Program { static void Main(string[] args) { Demo d = new Demo(); Console.Write(Enter your name:t); d.name = Console.ReadLine(); d.print(); Console.ReadLine(); } } }

  1. Private variable is not accessible in subclass.

  2. There is a syntax error in get property.

  3. It will give exception.

  4. The code will compile with no error.

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, It will compile properly as we get and set the property for the private variable so it is accessible now in subclass too.

Multiple choice

What is the error in the following code? using System; class Employee { private string[]name = new string[10]; public static string this[int index] { get { return name[index]; } set { name[index] = value; } } } class Test { public static void Main() { Employee emp = new Employee(); emp[0] = Sachin; emp[1] = Rohit; emp[2] = Amit; Console.WriteLine(Emploees are:); for (int i = 0; i < 3;i++) { Console.WriteLine(emp[i]); } Console.ReadLine(); } }

  1. The private modifier can not be used before array declaration.

  2. It will throw an exception.

  3. The static modifier is invalid in the code.

  4. The 'this' keyword is invalid in the code.

  5. No error
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We can not use static modifier in indexer declaration as static methods can not be used with a particular instance of the class and the indexer uses the instances of the class.

Multiple choice

What will be the output of the following code? using System;abstract class Base { protected int number; public abstract int this[int index]; class Child : Base { public override int this[int index] { get { return number; } set { number = value; } } } class Test { public static void Main() { Child obj = new Child(); obj[0] = 20; obj[1]=40 Console.WriteLine(The value is: + obj[0]); } } }

  1. 0

  2. 20

  3. 40

  4. Compilation error

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It will not compile because there are get and set attribute missed after the indexer's declaration. There should be public abstract int this[int index]{ get; set;} code like to remove this error.

Multiple choice

Find the output of the following code in C language assuming other parameters are correct. void main( ) { int a; int b; scanf ("%2d %5d", &a, &b); printf ("a = %d and b=%d.",a,b); }
/* input by the user is a=12345 and b = 67 during program execution*/

  1. a=12345 and b=67

  2. a=67 and b=12345

  3. a=12 and b=345

  4. a=12 and b=34567

  5. a=12 and b=67
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

%2d will restrict scanf function to assign only 2 digits in the variable a and rest of the digits will be assigned to the next scanf variable i.e. b.

Multiple choice

Find the output of the following code in C language, if assumed that all preprocessor directives are correct. void main ( ) { int a = 2, b = 2; if (a > 2)
if (b > 2)
printf ( "Hello"); Else
Printf ("Hi"); }

  1. Hello

  2. Hi

  3. Error in execution

  4. Normal program execution without any output

  5. Program code error
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

First IF statement is not satisfied  hence,  control will  go to second if,  as it is a statment for first IF and ELSE statement will take priority for second IF which is jumped by control.  Hence,  no output will be coming in print however program will run normally.

Multiple choice

Given code is written in C language. Find the output of the program.

int i = 6, j = 14, k = 7, l = 7, x; x = i > j ? j > k ? 12 : k > l? 13 : 14 : 15;printf("%d", x);

  1. 12

  2. 13

  3. 14

  4. 15

  5. %d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

x = i > j ? j > k ? 12 : k > l? 13 : 14 : 15; Taking operator precedence, control will start executing from center of the statement. Step I:x = i > j ?( j > k ? 12 : k) > l? 13 : 14 : 15 // Control will get k from here  Step II: Remove the executed part for better understanding x = i > j ? ( k > l? 13 : 14) : 15  // Here value is 14 Step III: x = i > j ? 14 : 15 // i is not greater than j. Hence, 15 will be assigned in int x variable. 

Multiple choice

What will be the output of the following program if 'n' key is pressed after execution of program? #include<stdio.h> #include<process.h> void main() {char ch; printf("enter Y/y to continue"); scanf("%c",&ch); if(ch=='y' || ch=='Y') printf("Yes"); else exit(1); }

Consider the letters written like A, B, C, V are the keys prssed by user. User can press any key, we have considered following keys has been prssed.

  1. Yes

  2. Exit from program

  3. Error: exit function should have prototype

  4. No

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As input to program is 'n'i.e. other than Y,y, it will exit from program

Multiple choice

What will be the output of following program code? #include<stdio.h> main() { int k; float j; j=9.0/2; k=9/2.0; printf(%dt%ft,k,j); j=9/2; k=9/2; printf(%dt%ft,k,j); k=9.0/2.0; j=2/9.0; printf(%dt%ft,k,j); }

  1. 4.000000 4.500000 4.000000 4 0.222222 4

  2. 4 4.500000 4 4.000000 0.222222 4

  3. 4 4.500000 4 4.000000 4 0.222222

  4. 4 4 4 4 4 0.000000

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

k=9/2.0=4, as k is integer type output will be an integer. j=9.0/2=4.500000, as j is of type float the output will be in float. k=9/2=4, as k is integer type output will be an integer. j=9/2=4.000000 j=2/9.0=0.222222 k=9.0/2.0=4, as k is integer type output will be an integer.

Multiple choice

What does the following program code do? #include<stdio.h> void main() {FILE *f;char ch; int noi=0; f=open(“d.txt”,”r”); while(1) { ch=fgetc(f); if(f==EOF) break; if(ch==’ ‘) noi++’;} fclose(f); printf(“No. of …….=%d”,noi);}

  1. Counts total number of character in file d.txt

  2. Counts number of blanks in file d.txt

  3. Counts number of tabs in file d.txt

  4. Counts number of lines in file d.txt

  5. Counts total number of characters in file ‘C’ source file
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ‘ ‘ counts the blanks in file opened.

Multiple choice

What will be the output of following program code? #include<stdio.h> main() {int a=10,b=12,c=0; if(!(a>5&&c)) { printf(%d,a!=6&&b>5); printf(%d,a==10||b<15&&c<1); } else printf(If expression is wrong);}

  1. 11

  2. 10

  3. 01

  4. 00

  5. 'If' expression is wrong.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

a=10,b=12,c=0(!(a>5&&c))=>!(10>5 && 0)=>!(1 &&0)=>!0=>1 If condition is true as we get ‘1’ in above expression.a!=6&&b>5=>10!=6 && 12>5 =>1 && 1 =>1a==10||b<15&&c<1 =>10==10 || 12<15 && 0<1 =>1 || 1 && 1=> 1 So option 1 is correct answer.