Coding Club

Eagle Ridge Middle School

Akash Pamal

Session 5

Today’s Talk

• Java Libraries and While Loops
• Using Java library APIs (Eg: Math)
• Practice Problems

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What is a while loop?

While (number >= 1){

Number = number/2;

Count++

}

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Chaining - if / else

int a = 20;

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if (a > 0) {� System.out.println("A is a positive number");�} else if (a < 0) {

System.out.println("A is a negative number");

} else {

System.out.println("I am not sure what A is");

}

Java Library APIs

• Java Language provides a rich set of library routines
• For performing standard math calculations - like square root, cube root, absolute value, trigonometric functions like sin, cos etc
• For reading input from user - like Scanner
• For printing results to the user - like System.out
• And many more

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Java Library APIs

• The library APIs are grouped together into classes and packages
• Before using a library API, the class or package needs to be imported into your program
• import java.lang.Math
• Import java.util.Scanner
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While Loop

int a = 1;

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while (as long as the condition is true) {� System.out.println("Value of a is " + a);

a = a + 1;�}

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System.out.println("Finished the while loop”);

While Loop

int a = 1;

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while (a < 10) {� System.out.println("Value of a is " + a);

a = a + 1;�}

Practice Problem

• Given 2 int values, return whichever value is nearest to the value 10, or return 0 in the event of a tie. Note that Math.abs(n) returns the absolute value of a number

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Practice Problem

• Given a num, find how many times can we divide it by 2

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Thank You