Week2 -- Discussion 1

Please read carefully the questions that follow. Do your research, write up your responses (on your own computer) to at least one question from 1~4 AND at least one question from 5~7. Support your answers with examples, and post them into the current conference.

1. (a) Can you assign an int value to a double variable?

Yes; The value will widen during floating point calculations and display as double unless explicitly displayed as an integer.

Fragment:

int x = 2

double z = 6

Output:

Calculated without forcing the output: 20.0

Explicit integer: 20

(b)Can you assign a double value to an int variable, like in the code fragment below? What would happen if you try to compile such a code fragment?

double dVal = 15.9;

int iVal = dVal;

No; The file will not compile and returns an error. Loss of information and narrowing will occur because the higher order bits will be removed if the conversion is allowed.

2. What is the output of the following code segment?

int x = 2;

double y = 6.6;

System.out.println( y / x );

System.out.println( (int) y / x );

OUTPUT:

3.3

_ <--Cursor

This output occurs in the first System.out.println () because during floating point math, the int type is widened to a become a double type number which is allowed in Java.

The second System.out.println () forces double number of 6.6 to the int number 6 and calculates using integer math, thereby returning an integer number as seen above.

5. Write a program that prompts for and reads a floating-point number and evaluates the polynomial 3x⁴-10x³+13. The program should display both the number read and the results of evaluating the polynomial. (See attached file below)

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