Question

post a brief description of a problem which to program a solution would require complex decisions (a decision required to test more than one condition) and/or loops. Provide a code snippet under your description which implements a solution using the most appropriate Java constructs.

please see similar example:

A particular clothes washing machine main control can instruct the machine to perform different tasks which include Off, Normal Wash, Delicate Wash, Rinse, and Spin. One way to process this is below:

switch (WashMachineCmd) {

case OffCmd:

{ /* Turn the washing machine off. Don’t care about previous state. */

currentState = OFF;

break; }

case NormalWash:

{ /* Start Normal wash cycle. */

If (previousState == OFF) {

currentState = NORMAL_WASH; }

else {

System.out.println(“ERROR: Cannot do Normal Wash from “ + displayState(previousState) + “.”);

}

break; }

case DelicateWash:

{ /* Start Delicate wash cycle. */

If (previousState == OFF) {

currentState = DELICATE_WASH; }

else {

System.out.println(“ERROR: Cannot do Delicate Wash from “ + displayState(previousState) + “.”);

}

break; }

case Rinse:

{ /* Start Rinse cycle. */

If ((previousState == NORMAL_WASH) || previousState == DELICATE_WASH) {

currentState = RINSE; }

else

{

System.out.println(“ERROR: Cannot do Delicate Wash from “ +

displayState(previousState) + “.”); }

break; }

case Spin:

{ /* Start Spin cycle. */

If (previousState == RINSE) {

currentState = SPIN; }

else {

System.out.println(“ERROR: Cannot do Delicate Wash from “ + displayState(previousState) + “.”);

}

break; }

}

Answer 1

We would take the example of gradation system in the examination. We would consider that the full mark is 100. A student gets 90 or above then the grade becomes O, 80 or above then grade becomes E, 70 or above grade becomes A, 60 or above grade becomes B, 50 or above, the grade becomes C and below 50 is fail(gets grade D). We would check results for 30 students inside the class.

So, the user would input the grade and would know the range of number a student can get.

The code snippet in here below:

char grade;

for(int i = 1;i<=30;i++)

{

switch (grade) {

case O:

{

System.out.println(" Student has scored more than 90");

status = "P";

break;

}

case E:

{

System.out.println(" Student has scored more than 80 but lesser than 90");

status = "P";

break;

}

case A:

{

System.out.println(" Student has scored more than 70 but lesser than 80");

status = "P";

break;

}

case B:

{

System.out.println(" Student has scored more than 60 but lesser than 70");

status = "P";

break;

}

case C:

{

System.out.println(" Student has scored more than 50 lesser than 60");

status = "P";

break;

}

case D:

{

System.out.println(" Student has scored lesser than 50 ");

status = "F";

break;

}

default:

System.out.println(" Invalid grade");

break;

}

switch(status)

{

case P:

{

System.out.println("The student is promoted");

break;

}

case F:

{

System.out.println("The student has failed");

break;

}

default:

{

System.out.println("Unknown status");

break;

}

}

}