1. Operators
Laboratory 6
2018/11/16

2. Arithmetic Operator Operator Description + addition - Subtraction
* Multiplication
/ Division
% Modules
++ Increment
Decrement
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3. Special operator Expression Equivalent expression a = a + 2; a +=2;
2018/11/16

4. Increment and Decrement
Expression Equivalent expression
a = a + 1; ++a;
a = a – 1; --a;
result
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5. Bitwise Operators Operator Description ~ Bitwise unary NOT
& Bitwise AND
| Bitwise OR
^ Bitwise exclusive OR
>> Shift Right
<< Shift LEFT
>>> Shift Right with zero fill
2018/11/16

6. Operation - examples Operator Expression AND 1 & 1 = 1; 1& 0 = 0
~ 0 =~1; 1 =~0;
^ 0^ 0 = 0; 1^1 = 0; 1^0 =1; 0^1 = 1
>> x0010 = 0x >>1
<< 0x0001 = 0x <<1
>>> 0x1001 = 0x >>>1
2018/11/16

7. SHIFT >> (right) by one bit
(0xf2) >> 1 (shift right by one bit)
(0x79)
Example byte c = 0xf2; byte e = c >>1; //e is 0x79
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8. Program for Question 1
2018/11/16

9. sample 2018/11/16 /* demonstarting arithmetic operator */
public class lecture61 {
public static void main(String[] args) {
//a few numbers
int x, y;
x = /2*2;
short j = 34;
System.out.println("The value of x is ...");
System.out.println(" x = " + x);
y = 5;
x = y << 5;
//using <<
System.out.println("demonstrating << ");
x = 2;
y = x++ + 2;
//using ++
System.out.println("demonstrating ++ "); }
2018/11/16

10. Prime number
2018/11/16

11. Sample 2018/11/16 import java.io.*; public class lab62 {
public static void main(String[] args)
throws java.io.IOException
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String s1;
int num, loop;
double sqr, num2;
boolean prime = true;
// read a number
System.out.println("Please enter a positive integer:");
s1 = br.readLine();
num = Integer.parseInt(s1);
if (num == 2)
prime = true;
else
//please fill in
if(prime)
System.out.println(num + " is a prime number."); }
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12. String to Double/Integer/Float
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13. Quadratic Equation
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14. Sample 2018/11/16 import java.io.*; public class lab63 {
public static void main(String[] args) throws IOException {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String s1;
double a, b, c;
double x1, x2;
// read a
System.out.print("Please enter the value of a: ");
s1 = br.readLine();
a = Double.valueOf(s1).doubleValue(); // convert string to double
// please fill in
System.out.println("When a = " + a + ", b = " + b + " and c = " + c + " X = " + x1 + " or " + x2); }
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15. Returning a value – from myarea.area()
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16. Sample 2018/11/16 import java.io.*; class Square { double width;
double area() {
return width*width; }
class lab64 {
public static void main(String[] argv) throws IOException {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);double width, b;
String s1;
// read a number
Square myarea = new Square(); //create an object
System.out.print("Please enter the width: ");
s1 = br.readLine();
b = Double.valueOf(s1).doubleValue(); // convert string to double
myarea.width = b; //assign a value
//compute the area
double a = myarea.area(); //return the value
System.out.print("area is " + a + "\n");
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17. High-low
2018/11/16

18. Sample 2018/11/16 import java.io.*; public class lab65 {
public static void main(String[] argv) throws IOException {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
int g, i; //guess and input
int tries = 0;
String s1;
i = (int) (Math.random() * ); // choose new random number between 1 and 100
// read a number
System.out.print("Please enter the guess: ");
s1 = br.readLine();
g = Integer.parseInt(s1); // convert string to integer
while(g != i) {
// please fill in
g = Integer.parseInt(s1); }
// Correct
System.out.print("Correct!, You have tried " + tries +" times");
2018/11/16