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https://github.com/codersales/notes-on-initial-programming

Notes-on-Initial-Programming
https://github.com/codersales/notes-on-initial-programming

2023 2023-10 2023-oct 2023-october initial-programming msc msc-y1 msc-y1-s1 msc-y1-s1-w6 notes

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Notes-on-Initial-Programming

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# Notes-on-Initial-Programming



## Description

Notes-on-Initial-Programming



## Table of Contents of Brightspace Module



[Lecture 1](https://learn.ul.ie/d2l/le/lessons/10840/topics/458147)



[Lecture 2 (not found)](https://learn.ul.ie/d2l/le/lessons/10840/topics/458507)



[Lecture 3](https://learn.ul.ie/d2l/le/lessons/10840/topics/463731)



[Lecture 4](https://learn.ul.ie/d2l/le/lessons/10840/topics/480279)



____



[Lab Week 5](https://learn.ul.ie/d2l/le/lessons/10840/topics/500828)



no later content than this on 2023-10-16-at-1529h



## Content



### Week-6



#### Lecture-Week-6



##### Digital Ocean



Let’s look at the available format specifiers available for printf:



%c character



%d decimal (integer) number (base 10)



%e exponential floating-point number



%f floating-point number



%i integer (base 10)



%o octal number (base 8)



%s String



%u unsigned decimal (integer) number



%x number in hexadecimal (base 16)



%t formats date/time



%% print a percent sign



\% print a percent sign



###### ChatGPT3_5



In the System.out.printf method in Java (and similar formatting in other programming languages), the % symbol is used to indicate a placeholder for a value to be inserted into the string being formatted. The characters following % specify the formatting for the value 



that will be inserted.



In the example "%9.7f":



% indicates the start of the formatting specifier.



9 specifies the minimum width of the field where the value will be inserted. In this case, it's saying that the minimum width is 9 characters. If the inserted value is less than 9 characters wide, it will be padded with spaces to the left.



.7 specifies the precision for floating-point numbers. It indicates that 7 decimal places should be shown.



f specifies that the value being inserted should be formatted as a floating-point number.



So, in summary, %9.7f is a formatting specifier for a floating-point number with a minimum width of 9 characters and 7 decimal places of precision.



```java

public class PrintPi {

    public static void main(String[] args) {

        double piValue = Math.PI;

        System.out.printf("Value of PI to 7 dec is %9.7f\n", piValue);

    }

}



```



```java

System.out.printf("Value of PI to 4 dec is %9.4f\n", Math.PI);

```



```java

System.out.printf("Value of PI to 2 dec is %-9.2f\n", Math.PI);

```



____



##### W6 Lec PART 2



##### ASCII Table



____



##### ChatGPT3_5



In Java, you can utilize the Character class to work with characters and perform the mentioned operations. Here's a brief guide on using Character for the specified tasks:



Checking if a Character is a Digit:



java

Copy code

char ch = '7';

boolean isDigit = Character.isDigit(ch);

Checking if a Character is a Letter:



```java



char ch = 'A';

boolean isLetter = Character.isLetter(ch);

Checking if a Character is Uppercase:

```



```java

char ch = 'C';

boolean isUppercase = Character.isUpperCase(ch);

Checking if a Character is Lowercase:

```



```java

char ch = 'd';

boolean isLowercase = Character.isLowerCase(ch);

Converting a Character to Lowercase or Uppercase:

```



```java

char ch = 'A';

char lowercaseCh = Character.toLowerCase(ch);

char uppercaseCh = Character.toUpperCase(ch);

Generating a Random Uppercase Letter:

```



```java

char randomUppercase = (char) ('A' + (int) (Math.random() * 26));

These functions allow you to manipulate and determine properties of characters in Java. Let me know if you need further clarification or additional code examples!

```



____



##### Storing Data (Fixed)



____



##### Storing Data (Dynamic)



____



In fixed size rep

var point at data



in dyn

var point at ref

pointing at date



... if change to the date

the reference might change....



_______



## Refrerences



### Printf



[geeksforgeeks Printf](https://www.geeksforgeeks.org/formatted-output-in-java/)



[digital ocean Printf](https://www.digitalocean.com/community/tutorials/java-printf-method)



[ASCII Table](https://www.asciitable.com/)