![4
if statement
if statement tests the condition. It executes the if block if condition is true.
public class IfStatementDemo{
public static void main(String[] ar)
{
int a = 10, b = 20;
if( a < b ) {
System.out.println("A is smaller than B");
}
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-4-320.jpg)
![5
if-else statement
if-else statement also tests the condition. It executes the if block if condition is
true otherwise else block is executed.
public class IfElseStatementDemo{
public static void main(String[] ar)
{
int a = 10, b = 20;
if(a<b) {
System.out.println("A is smaller than B");
}
else {
System.out.println(“A is not smaller than B");
}
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-5-320.jpg)
![7
Nested If statement
We can also use if/else if statement inside another if/else if statement, this is
known as nested if statement.
int username = Integer.parseInt(args[0]);
int password = Integer.parseInt(args[1]);
double balance = 123456.25;
if(username==1234){
if(password==987654){
System.out.println("Your Balance is
="+balance);
}
else{
System.out.println("Password is invalid");
}
}
else{
System.out.println("Username is invalid");
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-7-320.jpg)
![8
switch statement
switch statement executes one statement from multiple conditions. It is like if-
else-if ladder statement.
public class SwitchExampleDemo {
public static void main(String[] args)
{
int number = 20;
switch (number) {
case 10:
System.out.println("10");
break;
case 20:
System.out.println("20");
break;
default:
System.out.println("Not 10 or
20");
}
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-8-320.jpg)
![11
While Loop
while loop is used to iterate a part of the program several times. while is entry
control loop.
If the number of iteration is not fixed, it is recommended to use while loop.
//code will print 1 to 9
public class WhileLoopDemo {
public static void main(String[] args) {
int number = 1;
while(number < 10) {
System.out.println(number);
number++;
}
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-11-320.jpg)
![12
Do-while Loop
do-while loop is executed at least once because condition is checked after loop
body.
//code will print 1 to 9
public class DoWhileLoopDemo {
public static void main(String[] args) {
int number = 1;
do {
System.out.println(number);
number++;
}while(number < 10) ;
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-12-320.jpg)
![13
For Loop
for loop is used to iterate a part of the program several times.
If the number of iteration is fixed, it is recommended to use for loop.
//code will print 1 to 9
public class ForLoopDemo {
public static void main(String[] args)
{
for(int number=1;number<10;number++)
{
System.out.println(number);
}
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-13-320.jpg)
![16
Break statement
When a break statement is encountered inside a loop, the loop is immediately
terminated and the program control resumes at the next statement following
the loop.
//code will print 1 to 4 followed by “After Loop”
public class BreakDemo{
public static void main(String[] args)
{
for(int number=1;number<10;number++)
{
if(number==5) {
break;
}
System.out.println(number);
}
System.out.println(“After Loop”);
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-16-320.jpg)
![17
Continue statement
The continue statement is used in loop control structure when you need to
immediately jump to the next iteration of the loop. It can be used with for loop
or while loop.
//code will print 1 to 9 but not 5, followed by “After
Loop”
public class ContinueDemo {
public static void main(String[] args)
{
for(int number=1;number<10;number++)
{
if(number==5) {
continue;
}
System.out.println(number);
}
System.out.println(“After Loop”);
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-17-320.jpg)
![24
Math Example
public class MathDemo {
public static void main(String[] args) {
double sinValue = Math.sin(Math.PI / 2);
double cosValue = Math.cos(Math.toRadians(80));
int randomNumber = (int)(Math.random() * 100);
// values in Math class must be given in
Radians
// (not in degree)
System.out.println("sin(90) = " + sinValue);
System.out.println("cos(80) = " + cosValue);
System.out.println("Random = " + randomNumber);
}
}](https://image.slidesharecdn.com/unit-02selectionmathematicalfunctionsandloops-240911175821-3c2e11ea/85/Unit-02-Selection-Mathematical-Functions-and-loops-pptx-24-320.jpg)
Unit-02 Selection, Mathematical Functions and loops.pptx
- 2. Looping Outline If statement Two way if statement Nested if statement Switch statement Conditional Expression While loop Do-while loop For loop Nested loop Break and continue statement Common mathematical expression
- 3. 3 Control Statements Control Statements in Java is one of the fundamentals required for Java Programming. It allows the smooth flow of a program. Statement can simply be defined as an instruction given to the computer to perform specific operations. A control statement in java is a statement that determines whether the other statements will be executed or not. Control statements in Java, If statement If-else statement If-else ladder statement Switch statement
- 4. 4 if statement if statement tests the condition. It executes the if block if condition is true. public class IfStatementDemo{ public static void main(String[] ar) { int a = 10, b = 20; if( a < b ) { System.out.println("A is smaller than B"); } } }
- 5. 5 if-else statement if-else statement also tests the condition. It executes the if block if condition is true otherwise else block is executed. public class IfElseStatementDemo{ public static void main(String[] ar) { int a = 10, b = 20; if(a<b) { System.out.println("A is smaller than B"); } else { System.out.println(“A is not smaller than B"); } } }
- 6. 6 if-else statement if-else-if ladder statement executes one condition from multiple statements. int marks = 65; if (marks < 60) { System.out.println("fail"); } else if (marks >= 60 && marks < 80) { System.out.println("B grade"); } else if (marks >= 80 && marks < 90) { System.out.println("A grade"); } else if (marks >= 90 && marks < 100) { System.out.println("A+ grade"); } else { System.out.println("Invalid!"); }
- 7. 7 Nested If statement We can also use if/else if statement inside another if/else if statement, this is known as nested if statement. int username = Integer.parseInt(args[0]); int password = Integer.parseInt(args[1]); double balance = 123456.25; if(username==1234){ if(password==987654){ System.out.println("Your Balance is ="+balance); } else{ System.out.println("Password is invalid"); } } else{ System.out.println("Username is invalid"); }
- 8. 8 switch statement switch statement executes one statement from multiple conditions. It is like if- else-if ladder statement. public class SwitchExampleDemo { public static void main(String[] args) { int number = 20; switch (number) { case 10: System.out.println("10"); break; case 20: System.out.println("20"); break; default: System.out.println("Not 10 or 20"); } } }
- 9. 9 Programs to perform (Conditional Statements) Write a Java program to get a number from the user and print whether it is positive or negative. Write a program to find maximum no from given 3 no. The marks obtained by a student in 5 different subjects are input through the keyboard. The student gets a division as per the following rules: Percentage above or equals to 60-first division Percentage between 50 to 59-second division Percentage between 40 and 49-Third division Percentage less than 40-fail Write a program to calculate the division obtained by the student. Write a Java program that takes a number from the user and displays the name of the weekday accordingly (For example if user enter 1 program should return Monday) .
- 10. 10 Looping Statement Looping in programming languages is a feature which facilitates the execution of a set of instructions/functions repeatedly while some condition evaluates to true. Java provides three ways for executing the loops. While all the ways provide similar basic functionality, they differ in their syntax and condition checking time. While loop Do-while loop For Foreach (will cover this after array)
- 11. 11 While Loop while loop is used to iterate a part of the program several times. while is entry control loop. If the number of iteration is not fixed, it is recommended to use while loop. //code will print 1 to 9 public class WhileLoopDemo { public static void main(String[] args) { int number = 1; while(number < 10) { System.out.println(number); number++; } } }
- 12. 12 Do-while Loop do-while loop is executed at least once because condition is checked after loop body. //code will print 1 to 9 public class DoWhileLoopDemo { public static void main(String[] args) { int number = 1; do { System.out.println(number); number++; }while(number < 10) ; } }
- 13. 13 For Loop for loop is used to iterate a part of the program several times. If the number of iteration is fixed, it is recommended to use for loop. //code will print 1 to 9 public class ForLoopDemo { public static void main(String[] args) { for(int number=1;number<10;number++) { System.out.println(number); } } }
- 14. 14 Nested Loop
- 15. 15 Programs to perform (Looping Statements) Write a program to print first n odd numbers. Write a program to check that the given number is prime or not. Write a program to draw given patterns,
- 16. 16 Break statement When a break statement is encountered inside a loop, the loop is immediately terminated and the program control resumes at the next statement following the loop. //code will print 1 to 4 followed by “After Loop” public class BreakDemo{ public static void main(String[] args) { for(int number=1;number<10;number++) { if(number==5) { break; } System.out.println(number); } System.out.println(“After Loop”); } }
- 17. 17 Continue statement The continue statement is used in loop control structure when you need to immediately jump to the next iteration of the loop. It can be used with for loop or while loop. //code will print 1 to 9 but not 5, followed by “After Loop” public class ContinueDemo { public static void main(String[] args) { for(int number=1;number<10;number++) { if(number==5) { continue; } System.out.println(number); } System.out.println(“After Loop”); } }
- 18. 18 Math class The Java Math class provides more advanced mathematical calculations other than arithmetic operator. The java.lang.Math class contains methods which performs basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions. All the methods of class Math are static. Fields : Math class comes with two important static fields E : returns double value of Euler's number (i.e 2.718281828459045). PI : returns double value of PI (i.e. 3.141592653589793).
- 19. 19 Methods of class Math
- 20. 20 Methods of class Math (Cont.)
- 21. 21 Methods of class Math (Cont.)
- 22. 22 Methods of class Math (Cont.)
- 23. 23 Methods of class Math (Cont.)
- 24. 24 Math Example public class MathDemo { public static void main(String[] args) { double sinValue = Math.sin(Math.PI / 2); double cosValue = Math.cos(Math.toRadians(80)); int randomNumber = (int)(Math.random() * 100); // values in Math class must be given in Radians // (not in degree) System.out.println("sin(90) = " + sinValue); System.out.println("cos(80) = " + cosValue); System.out.println("Random = " + randomNumber); } }