Java Structures Exercises

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  1. Draw a flowchart that represents each of the parts of the following Java code: 
    int counter = 0;
System.out.println( "Before the loop" );
while( counter < 3 ){
    System.out.println( counter );
    ++counter;
}
System.out.println( "After the loop" );
  2. Draw a flowchart that represents each of the parts of the following Java code: 
    System.out.println( "Before the loop" );
for( int counter = 0; counter < 3; ++counter){
    System.out.println( counter );
}
System.out.println( "After the loop" );
  3. Draw a flowchart that represents each of the parts of the following Java code: 
    int counter = 0;
System.out.println( "Before the loop" );
do{
    System.out.println( counter );
    ++counter;
}while( counter < 3 );
System.out.println( "After the loop" );
  4. Use a while loop to complete the following code based on the description in the comment header: 
    /**
 * Continually prompts that user until they enter "yes" or "no" and then displays their response
 * @author Hyrum D. Carroll
 * @version 0.2 (June 25, 2020)
 */

import java.util.Scanner;

public class UserResponse{
    public static void main( String[] args ){
        Scanner input = new Scanner(System.in);
	String prompt = "May I have another cookie? ";
	String response = "";

    


        System.out.println( "You entered " + response );
    }
}
  5. Rewrite the while loop in UserResponse to be a do-while loop.
  6. Use a for loop to complete the following code based on the description in the comment header: 
    /**
 * Counts up by powers of powers of 2 (starting at 1 until UPPER_LIMIT, which is 1,000,000)
 * @author Hyrum D. Carroll
 * @version 0.3 (June 25, 2020)
 */
public class PowersOfTwo{

    

    public static void main( String[] args ){

	

    }
}
  7. Replace the if statement with an equivalent switch statement: 
    /**
* Returns the log base 2 (for powers of 2)
* @param number A power of 2
* @return the log base 2 of number
*/
public static int logBase2( int number ){
    int log;
    if( number == 1){
        log = 0;
    }else if( number == 2 ){
        log = 1;
    }else if( number == 4 ){
        log = 2;
    }else if( number == 8 ){
        log = 3;
    }else if( number == 16 ){
        log = 4;
    }else if( number == 32 ){
        log = 5;
    }else if( number == 64 ){
        log = 6;
    }else if( number == 128 ){
        log = 7;
    }else if( number == 256 ){
        log = 8;
    }else if( number == 512 ){
        log = 9;
    }else{
        log = -1;
    }

    return log;
}