Object-Oriented Programming

Question

1. What is a sequential and selection control program?

2. Write a simple program in java demonstrating a selection control structure.

3. What is Repetition Program Structure?

4. Give samples programs (three of each type) for, while and do-while java program.

Answer 1

1) sequential ...

statements are execute in order, one after another

selection: different blocks of code are executed (and other blocks

are skipped) based on the value of the variable

3)

Repetition (a.k.a Iteration, a.k.a LOOPING)

executes a block of code a specified number of

times OR while / until a condition holds true

/*******************************************************************

Prompt the user to input an integer value and then

outputs if the integer is positive, negative or zero;

Continues until the user chooses to quit

********************************************************************/

import java.util.Scanner;

class Akisha

{

public void Go()

{

Scanner scanner = new Scanner(System.in); //keyboard input

int yesNo=1;

while (yesNo==1)

{

System.out.print(" Please input the integer value:>");

int x = scanner.nextInt();

if (x>0) // output based on value

{

System.out.println(x + " is positive ");

}

else if (x<0)

{

System.out.println( x + " is negative ");

}

else

{

System.out.println("x = 0 ");

}

for (int iLoop=0; iLoop<25; iLoop++)

{

System.out.print("-");

} //for loop

do

{

System.out.print("\n\n Again ??? 1=YES 0=NO :>");

yesNo=scanner.nextInt();

}

while ((yesNo!=0) && (yesNo!=1)); //do-while loop

} //while

}

public static void main(String args[])

{

Akisha x = new Akisha();

x.Go();

}

}