Question

Answer the following

1. What is the difference between these two methods?

Void display(int x)

Int display(int s)

2. Write a one line of code to generate random numbers from 35 to 55.( not a full program)

3. Draw the UML diagram for a switch statement with 4 cases .

4. Write a while loop to output the value of the variable x starting from 5, decreasing it by 0.5 each time, as long as x remains positive.

5. Write a for loop to display the square of the first 25 odd positive integers

6. Write a method called Test that takes one argument of type int and returns a bollean value. The method should return true if the integer is less than 100.Otherwise it should return False .

7. For the above method in # 8 write a main method with declarations and method call statement which assigns the return value to a variable.

8. Given method declaration statements before main

       Public static Double sum(double number);

Public static int sum(double y);

Is this a valid declaration? Why? _____________, _____________________

9. What is wrong with the following code?

Public static Boolean result(int x)

{

If(x>0)

return 1;

}                                                                                                __________________________

10. Assume the code below is part of a complete program, what will be the output of the code?

1. for ( int count = 1; count < 100; count++);

cout << (10 * count) << “ “ ;

________________

2. int total=75,score=20;         

total += score ;

system.println(“New Total is”);

system.printf(“%d,%n,%d%n%d”, ++ total, total − − ,total);                                                        

                                                                                         ____________

3. int i = 1;

       while ( i <= 10)

        {

            if(i==8)

                        break;

               cout<< i+ 3;

             i++;

        }                                                                 ____________________

4. int i,j;

        for(i=0;i<2;i++)

   {

          for(j=0;j<=3;j++)

                        {

                     cout<< “Hi”;

                        }

cout<<’_*’;

        }                                                                           __________________________                                

Answer 1

Answer:

What is the difference between these two methods?

1. Void display(int x) : It return nothing
2. Int display(int s) : It return integer value

Write a one line of code to generate random numbers from 35 to 55.

int randInt = 35 + rand.nextInt(21);

Draw the UML diagram for a switch statement with 4 cases .

Write a while loop to output the value of the variable x starting from 5, decreasing it by 0.5 each time, as long as x remains positive.

double x = 5;

       while(x>0) {
           System.out.println(x);
           x -= 0.5;

       }

Write a for loop to display the square of the first 25 odd positive integers

int x = 1;

while(x<50) {

System.out.println(x*x);

x += 2;

}

Write a method called Test that takes one argument of type int and returns a bollean value. The method should return true if the integer is less than 100.Otherwise it should return False .

public static boolean Test(int x) {
       if ( x < 100 )
           return true;

       return false;
       }

For the above method in # 8 write a main method with declarations and method call statement which assigns the return value to a variable.

public static void main(String[] args) {
       boolean b = Test(10);
   }

Given method declaration statements before main

Public static Double sum(double number);

Public static int sum(double y);

Is this a valid declaration? Why?

No, This is not a valid declaration because "public" and "double" keyword should start with lower case.

What is wrong with the following code?

Public static Boolean result(int x)

{

If(x>0)

return 1;

}    

Keyword "public" and "boolean" should be lower case.

Assume the code below is part of a complete program, what will be the output of the code?

for ( int count = 1; count < 100; count++);

cout << (10 * count) << “ “ ;

Output : 10, 20, 30, ...... 980, 990

int total=75,score=20;         

total += score ;

system.println(“New Total is”);

system.printf(“%d,%n,%d%n%d”, ++ total, total − − ,total);                                                        

Output :

96

96

95

int i = 1;

       while ( i <= 10)

        {

            if(i==8)

                        break;

               cout<< i+ 3;

             i++;

        }

Output:

45678910

int i,j;

        for(i=0;i<2;i++)

   {

          for(j=0;j<=3;j++)

                        {

                     cout<< “Hi”;

                        }

cout<<’_*’;

        }

Output :

HiHiHiHi*HiHiHiHi

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