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1. Select the correct option to write a program to find the sum of natural numbers upto 10.

Option 1

#include
int main() {
int n, i, sum = 0;
printf("Enter a number upto which the natural numbers need to added: ");
scanf("%d", &n);
for (i = 1; i <= n; ++i) {
sum = i+1;
}
printf("Sum = %d", sum);
return 0;
}

Option 2

#include
int main() {
int n, i;
printf("Enter a number upto which the natural numbers need to added: ");
scanf("%d", &n);
for (i = 1; i <= n; ++i) {
i++;
}
printf("Sum = %d", i);
return 0;
}

Option 3

#include
int main() {
int n, i, sum = 0;
printf("Enter a number upto which the natural numbers need to added: ");
scanf("%d", &n);
for (i = 1; i <= n; ++i) {
printf("Sum = %d", i);
}
return 0;
}

#include
int main() {
int n, i, sum = 0;
printf("Enter a number upto which the natural numbers need to added: ");
scanf("%d", &n);
for (i = 1; i <= n; ++i) {
sum += i;
}
printf("Sum = %d", sum);
return 0;
}

2. Select the correct option to write a program to find whether a entered character is vowel or consonant.

Option 1

#include
int main() {
char c;
int lowercase_vowel, uppercase_vowel;
printf("Enter an alphabet: ");
scanf("%c", &c);
lowercase_vowel.equals(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
uppercase_vowel.equals(c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
if (lowercase_vowel || uppercase_vowel)
printf("%c is a vowel.", c);
else
printf("%c is a consonant.", c);
return 0;
}

Option 2

#include
int main() {
char c;
int lowercase_vowel, uppercase_vowel;
printf("Enter an alphabet: ");
scanf("%c", &c);
lowercase_vowel== (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
uppercase_vowel== (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
if (lowercase_vowel == uppercase_vowel)
printf("%c is a vowel.", c);
else
printf("%c is a consonant.", c);
return 0;
}

Option 3

#include
int main() {
char c;
int lowercase_vowel, uppercase_vowel;
printf("Enter an alphabet: ");
scanf("%c", &c);
// evaluates to 1 if variable c is a lowercase vowel
lowercase_vowel.equals(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
// evaluates to 1 if variable c is a uppercase vowel
uppercase_vowel.equals(c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
// evaluates to 1 (true) if c is a vowel
if (lowercase_vowel && uppercase_vowel)
printf("%c is a vowel.", c);
else
printf("%c is a consonant.", c);
return 0;
}

#include
int main() {
char c;
int lowercase_vowel, uppercase_vowel;
printf("Enter an alphabet: ");
scanf("%c", &c);
lowercase_vowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
uppercase_vowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
if (lowercase_vowel || uppercase_vowel)
printf("%c is a vowel.", c);
else
printf("%c is a consonant.", c);
return 0;
}

3. Select the correct option to write a program to find whether a number is a prime number

Option 1

#include
int main() {
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (i = 2; i <= n % 2; ++i) {
// condition for non-prime
if (n % i == 0) {
flag = 1;
break;
}
}
if (n == 1) {
printf("1 is neither prime nor composite.");
}
else {
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
}

Option 2

#include
int main() {
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (i = 2; i <= n / 2; ++i) {
// condition for non-prime
if (n % i == 2) {
break;
}
}
if (n == 1) {
printf("1 is neither prime nor composite.");
}
else {
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
}

Option 3

#include
int main() {
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (i = 0; i <= n; ++i) {
// condition for non-prime
if (n % i == 0) {
flag = 1;
}
}
if (n == 1) {
printf("1 is neither prime nor composite.");
}
else {
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
}

#include
int main() {
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (i = 2; i <= n / 2; ++i) {
// condition for non-prime
if (n % i == 0) {
flag = 1;
break;
}
}
if (n == 1) {
printf("1 is neither prime nor composite.");
}
else {
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
}

4. Select the correct option to write a program to find whether the entered year is a leap year or not

Option 1

#include
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
if (year % 400 == 0) {
printf("%d is a leap year.", year);
}
else {
printf("%d is not a leap year.", year);
}
return 0;
}

Option 2

#include
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
if (year / 400 == 0) {
printf("%d is a leap year.", year);
}
else if (year / 100 == 0) {
printf("%d is not a leap year.", year);
}
else if (year / 4 == 0) {
printf("%d is a leap year.", year);
}
else {
printf("%d is not a leap year.", year);
}
return 0;
}

#include
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
if (year % 400 == 0) {
printf("%d is a leap year.", year);
}
else if (year % 100 == 0) {
printf("%d is not a leap year.", year);
}
else if (year % 4 == 0) {
printf("%d is a leap year.", year);
}
else {
printf("%d is not a leap year.", year);
}
return 0;
}

5. Select the correct option to write a program to swap two numbers without a third variable.

Option 1

#include
int main()
{
int a=10, b=20;
printf("Before swap a=%d b=%d",a,b);
a=a++;
b=b++;
a=a-b;
printf("\nAfter swap a=%d b=%d",a,b);
return 0;
}

Option 2

#include
int main()
{
int a=10, b=20;
printf("Before swap a=%d b=%d",a,b);
a=a/2;
b=b++;
a=a-b;
printf("\nAfter swap a=%d b=%d",a,b);
return 0;
}

Option 3

#include
int main()
{
int a=10, b=20;
printf("Before swap a=%d b=%d",a,b);
a=a+b;
b=b++;
a=a-b;
printf("\nAfter swap a=%d b=%d",a,b);
return 0;
}

#include
int main()
{
int a=10, b=20;
printf("Before swap a=%d b=%d",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("\nAfter swap a=%d b=%d",a,b);
return 0;
}

1. Select the correct option to rewrite without using ‘ if ’
if(bill < 7000)
discount = 0.05;
else
discount = 0.1;

Option 1

discount = (bill < 7000)= 0.05 && 0.1;

Option 2

discount = (bill < 7000)= 0.05 || 0.1;

discount = (bill < 7000)? 0.05 : 0.1;

2. Select the correct option to write a program to calculate the area of a triangle.

Option 1

class ques4
{
public static void main(String args[])
{
int a = 2,b = 3,c = 4;
double area;
double s = (a+b+c)/2.0;
area = Math.area(s*(s-a)*(s-b)*(s-c))/(2*a*b);
System.out.println ("Area of the Triangle");
System.out.println ("of sides "+a+","+b+","+c);
System.out.println ("is : "+area);
}
}

Option 2

class ques4
{
public static void main(String args[])
{
int a = 2,b = 3,c = 4;
double area;
double s = (a+b+c);
area = Math.area(s*(s-a)*(s-b)*(s-c))/(2*a*b);
System.out.println ("Area of the Triangle");
System.out.println ("of sides "+a+","+b+","+c);
System.out.println ("is : "+area);
}
}

class ques4
{
public static void main(String args[])
{
int a = 2,b = 3,c = 4;
double area;
double s = (a+b+c)/2.0;
area = Math.sqrt(s*(s-a)*(s-b)*(s-c))/(2*a*b);
System.out.println ("Area of the Triangle");
System.out.println ("of sides "+a+","+b+","+c);
System.out.println ("is : "+area);
}
}

3. What type of value is returned by Math.sqrt( )?

Int

Float

Double

All

Double

4. Reverse a string in Java

Option 1

public class StringPrograms {
public static void main(String[] args) {
String str = "123";
System.out.println(String.reverse(str));
}
}

public class StringPrograms {
public static void main(String[] args) {
String str = "123";
System.out.println(reverse(str));
}
public static String reverse(String in) {
if (in == null)
throw new IllegalArgumentException("Null is not valid input");
StringBuilder out = new StringBuilder();
char[] chars = in.toCharArray();
for (int i = chars.length - 1; i >= 0; i--)
out.append(chars[i]);
return out.toString();
}
}

5. Select the correct option to check vowels in a string

Option 1

public class StringContainsVowels {
public static void main(String[] args) {
System.out.println(stringContainsVowels("Hello")); // true
System.out.println(stringContainsVowels("TV")); // false
}
public static boolean stringContainsVowels(String input) {
return input.toLowerCase() (".*[aeiou].*");
}
}

Option 2

public class StringContainsVowels {
public static void main(String[] args) {
System.out.println(stringContainsVowels("Hello")); // true
System.out.println(stringContainsVowels("TV")); // false
}
public static boolean stringContainsVowels(String input) {
return input.contains (".*[aeiou].*");
}
}

public class StringContainsVowels {
public static void main(String[] args) {
System.out.println(stringContainsVowels("Hello")); // true
System.out.println(stringContainsVowels("TV")); // false
}
public static boolean stringContainsVowels(String input) {
return input.toLowerCase().matches(".*[aeiou].*");
}
}

1. Select the output of the following C++ code. Also, write the name of feature of Object Oriented Programming used in the following program jointly illustrated by the functions [I] to [IV]: #include
void Lined //Function[I]
{
for(int L=1;L<=80;L++)
cout<<"-";
cout< }
void Line(int N)
{
for(int L=1;L<=N;L++);
cout«"*";
cout< }
void Line(char C,int N) //Function[III]
{
for(int L=1:L<=N:L++)
cout< cout< }
void Line(int M, int N)//Function[IV]
{ for(int L=1:L cout< cout< }
void main()
{
int A=9, B=4, C=3;
char K=’#':
Line (K,B);
Line (A,C);
}

Option 1

91822

Option 2

90827

Option 3

91826

Feature of C ++ Function overloading Output will be :
####
91827

2. What is the difference between double and float variables in Java?

Answer

In java, float takes 4 bytes in memory while Double takes 8 bytes in memory. Float is single precision floating point decimal number while Double is double precision decimal number.

In java, float takes 4 bytes in memory while Double takes 8 bytes in memory. Float is single precision floating point decimal number while Double is double precision decimal number.

3. Explain Method Overriding in Java

The same name

The same argument

The same return type

Method Overriding in Java allows a subclass to offer a specific implementation of a method that has already been provided by its parent or superclass. Method overriding happens if the subclass method and the Superclass method have:

4. Select the correct option to display current date and time?

Option 1

import java.util.Date;
public class DateDemo {
public static void main(String args[]) {
// Instantiate a Date object
Date date = null;
System.out.println(date);
}
}

Option 2

import java.util.Date;
public class DateDemo {
public static void main(String args[]) {
// Instantiate a Date object
Date date = null;
System.out.println(getDate());
}
}

import java.util.Date;
public class DateDemo {
public static void main(String args[]) {
// Instantiate a Date object
Date date = new Date();
// display time and date using toString()
System.out.println(date.toString());
}
}

5. What will be the exception produced by the following code snippet?

Option 1

import java.io.*;
public class ExcepTest {
public static void main(String args[]) {
try {
int a[] = new int[2];
System.out.println("Access element three :" + a[3]);
} catch (Exception e) {
System.out.println("Exception thrown :" + e);
}
System.out.println("Out of the block");
}
}

Exception thrown :java.lang.ArrayIndexOutOfBoundsException: 3
Out of the block

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