Quiz on Decision Making in Java

class IfExample {

public  static void main ( String args [ ] ) 

{

Scanner s = new Scanner(System.in);

int a = s.nextInt();

if(a==7) {

system.out.println(“ If statement is executed “);

}

}

}

 class IfElseSample {

public static void main ( String args [ ] ) 

{

String s = “ DataFlair”;

Char d [ ] = { ‘D’ , ‘a’, ‘t’, ‘a’ , ‘F’ , ‘l’ , ‘a’ , ‘i’ , ‘r’ };

String a = new String(d);

if(s.isequals(a)) {

system.out.println(“Two strings are equal”);

} else {

system.out.println(“Two strings are not equal”);

}

}

}

Which of the following is the right syntax for a nested if loop ?

class Sample {

public static void main ( String args [ ]  ) 

{

int a = 4 ;

if( a < 10 ) {

if ( a < 5 ) {

system.out.println(“The number is also less than 5 “);

}else {

system.out.println(“The number is less than 10 alone “);

}

 If the input value from the user does not match with any case statements in the switch case , which block of statement will be executed ?

 class SwitchExample {

public static void main ( String args [ ] )

{

int a = 5 ;

switch(a) 

{

case 5: 

{

system.out.println(“Number is 5 “);

}

case 6:

{

system.out.println(“Number is not a 5 “);

}

Default:

{

system.out.println(“It is an unknown number”);

}

}

}

}

class Demo {

public static void main ( String args [ ] )

{

int x = 0;

switch(x)

{

case 0 :

{

system.out.println(“The number is 0 “);

break;

}

case 1:

{

system.out.println(“The number is not zero “);

break;

}

}

     }

}

 Which of the following is true about the switch case ?

class SwitchCaseSample {

public static void main ( String args [ ] )

{

float pi =  3.14;

switch(pi)

{

case 3.14:

{

system.out.println(“This is the value of PI “);

break;

}

default:

{

system.out.println(“This is not the value of PI”);

break;

}

}

}

}

Which of the following is the correct syntax of a switch case in Java ?

 class ReturnStatement {

public static void main ( String args [ ] )

{

int a = 10;

if(a == 10) {

system.out.println(a);

return;

++a;

system.out.println(a);

}

}

}

class ContinueStatement {

public static void main( String args [ ] ) {

int [ ] marks = {88 , 89 , 29 , 91 , 92};

for(int x : marks ) {

if( x <= 35 ) {

            continue;

         }

system.out.println(“Subjects passed are :”);

System.out.print( x );

            }

}

}

When there will be a compile time error in the if statement?

class NestedIf {

public static void main ( String args [ ] ) 

{

int a = 8;

if(a<10) {

if(a<=8) {

if(a<8){

system.out.println(“ Number is less than 8 “);

}

system.out.println(“Number is less than or equal to 8”);

}

system.out.println(“Number is greater than 10);

}

}

}

 Which of the following statements is more efficient than executing a long if else ladder?