Two dimensional array questions in java

faq 2 dimensional array questions and answers in java

(1)                      

public class ArrayDemo {

    public static void main(String[] args) {

         double arr[3];

         arr[0]=2.1;

         arr[1]=3.1;

         arr[2]=4.1;

         System.out.println(arr[1]+arr[2]);

    }

}

What will be the output of above java program?

(a)7.2

(b) Any number greater than 7.2

(c) Any number less than 7.2

(d) Compiler error

Answer: (d)

(2)

public class ArrayDemo {

    public static void main(String[] args) {

         double arr[]=new double[5];

         System.out.println(arr[1]*arr[2]);

    }

}

What will be the output of above java program?

(a)0.0

(b)NaN

(c)Run time exception

(d) Compiler error

Answer: (a)

(3)

public class ArrayDemo {

    public static void main(String[] args) {

         double [] arr={1.D,2.D,3.D};

         System.out.println(arr[3]);

    }

}

What will be the output of above java program?

(a)3.0

(b)0.0

(c)Run time excepion

(d) Compiler error

Answer: (c)

(4)

public class ArrayDemo {

    public static void main(String[] args) {

         long arr[][]={10L,20L,30L,40L};

         System.out.println(arr[1][1]);

    }

}

What will be the output of above java program?

(a)10

(b)30

(c)40

(d) Compiler error

Answer: (d)

(5)

public class ArrayDemo {

    public static void main(String[] args) {

         long arr[][]={{10l},{20l,30l,40l,50l}};

         System.out.println(arr[1][2]);

    }

}

What will be the output of above java program?

(a)0

(b)40

(c)30

(d) Compiler error

Answer: (b)

(6)

public class ArrayDemo {

    public static void main(String[] args) {

         long [][]arr=new long [2][];

         arr[0]=new long[2];

         arr[1]=new long[3];

         arr[0][1]=5L;

         System.out.println(arr[0][1]);

    }

}

What will be the output of above java program?

(a)5

(b)5l

(c)5L

(d) Compiler error

Answer: (a)

(6)

public class ArrayDemo {

    public static void main(String[] args) {

         long [][]arr=new long [2][];

         arr[0]=new int[2];

         arr[1]=new int[3];

         arr[0][1]=015L;

         System.out.println(arr[0][1]);

    }

}

What will be the output of above java program?

(a)13

(b)15

(c)0

(d) Compiler error

Answer :( d)

(7)

public class ArrayDemo {

    public static void main(String[] args) {

         if((int)Math.sqrt(2)==1)

             System.out.println("equal(+)");

         if((int)Math.sqrt(2)==-1)

             System.out.println("equal(-)");

    }

}

What will be the output of above java program?

(a) equal(+)

(b) equal(-)

(c) equal(+)

    equal(-)

(d)Compiler error

Answer: (a)

(8)

public class ArrayDemo {

    public static void main(String[] args) {

         int []arr,a;

         arr=new int[2];

         a=011;

         arr[0]=arr[1]=a;

         System.out.print(arr[0]+arr[1]);

    }

}

What will be the output of above java program?

(a)22

(b)18

(c)022

(d)Compiler error

Answer: (d)

(9)

public class ArrayDemo {

    public static void main(String[] args) {

         int [] arr1,arr2;

         arr1=new int[1];

         arr2=new int[2];

         arr1[0]='\n';

         arr2[0]='a';

         System.out.print(arr2[0]%arr1[0]);

    }

}

What will be the output of above java program?

(a)6

(b)7

(c)0

(d)Compiler error

Answer: (d)


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