Java/C2/Primitive-type-conversions/English

Title of script: Type Conversion in Java

Author: TalentSprint

Keywords: datatype, int, float, char, conversion, video tutorial

Visual Cue	Description
Slide 1 Welcome	Welcome to the spoken tutorial on Type Conversion in Java.
Slide 2 Learning Outcomes	In this tutorial, you will learn: How to convert data from one data type to another. the two types of conversion, namely implicit and explicit conversion. How to convert strings to numbers
Slide 3 Tools Used	For this tutorial we are using Ubuntu 11.10 JDK 1.6 Eclipse 3.7
Slide 4 Prerequisites	To follow this tutorial, you must have knowledge of data types in Java. If not, for relevant tutorial please visit our website as shown
Slide 5 Type Conversion	Type conversion means converting data from one data type to another. Let us see how it it done. Switch to Eclipse
Minimize Slides and open Eclipse Eclipse should contain the following code public class TypeConversion { public static void main(String[] args) { } }	Here we have the Eclipse IDE and the skeleton required for the rest of the code. I have created a class TypeConversion and added the main method to it. Now let us create a few variables.
In the main method, type int a = 5; float b; b = a; System.out.println(b);	int a equal to 5 float b b equal to a I have created two variables. a which is and integer and b which is a float. I’m storing the integer value in a float variable. Let us see what the float variable now contains. System dot out dot println b ' Save the file and run it.
Save and run. Point to output	We can see that the integer 5 has been converted to float 5.0 This type of conversion is called implicit conversion. As the name goes, the value is automatically converted to suit the data type. Now let us convert float to an int, using the same method.
Change a = 5 to a Change b to b = 2.5f; Change b = a to a = b; Change b to a inside println Point to the cross mark on left.	Remove the 5 float b equal to 2.5f and let us store b in a and print the value of a . Save the file. we see that there is an error. The error message reads, Type mismatch: cannot convert from float to int It means Implicit conversion is possible only from an int to a float but not the the other way. To convert a float to int we have to use explicit conversion. Let us see how to do so.
Change a = b to a = (int) b and point to that line	We do that by using an int in parentheses.before the variable This statement says the data in the variable b has to be converted to int data type and stored in a.
save and run. Point to output	save and run the file As we can see, the float value has been converted to int. But to suit the data type, the data has been changed accordingly. Explicit conversion can also be used to convert data from int to float. Let us try anthe previous example.
Change int a to int a = 5 Change float b = 2.5f to float b; Change a = (int) b to b = (float) a; Change println(a) to println(b) save and run. Point to output	int a =5, float b, b = float a System.out.println(b); We are using Explicit conversion to convert integer to a float Save the file and Run it. we see that the int value has been converted to a float value Let us see what happens when we convert a character to integer.
Remove everything in the main function and type the following char c = 'm'; int a; a = (int) c; System.out.println(a);	int a, charc char c equal to 'm'; ' a equal to (int) c; System dot out dot println ' a. We are convewrting character m to an integer and printing the value Let us save and run it
Save and run. Point to output	As we can see, the output is 109 which the ascii value of m. It means when a char is converted to int, its ascii value is stored. Let us try this with a digit.
Change c = 'm' to c = ' '	char c = digit 5 Save it and run it
Save and run. Point to output	As we can see, the output is 53 which is the ascii value of the character ‘5’ It is not the number 5. To get the number, we have to use a string and convert it to an integer. Now let us see how to do so.
Remove everyting in main function and type the following. String sHeight = “6”; int h = (int) sHeight; System.out.println(h);	Clean up the main function type String sHeight equal to in double quotes 6 semicolon. int h equal to explicit conversion to int of sHeight and System dot out dot println h Save the file. I’ve created a string variable with value 6 and i am trying to convert it to an integer but we see that their is an error
Point to cross mark on the left	And the error message reads Cannot cast from String to int. This means for converting strings, we cannot use implicit or explicit conversion. It must be done by other methods. let us use them
Remove the int h... and type int h = Integer.parseInt(sHeight);	Remove the int h... and type Integer dot parseInt sHeight . Save the file and run it
Save and run. Point to output	we see that value has been successfully converted to an integer. To do this we use the parseInt method of the integer module. Now let us see what happens if their are more than one digits like 6543 Save the file and run it
Point to console	We see that again strings contain the number has been successfully converted to an integer Now let us see what happens if the strings is a floating point number Change 6543 to65.43.So we have a floating point number in the string and we are converting it to an integer Save the file run it.
Save and run. Point to output	We see that their is an error This happens beacuse we cannot convert strings which contains floating point number into an integer We have to convert it TO afloat.Let us see how to do so; First data type should be float, Second we will use float . parsefloat, We are using the Parsefloat methods of the float class to convert the string containing a floating point number into an actual floating point number. Save the file run it. We can see the string containing a floating point number has been successfully converted into floating point number. And this is how we do implicit and explicit conversion and How do we converts strings to numbers
Minimize the Eclipse window and switch to slides. Slide 6 Summary	This brings us to the end of this tutorial. In this tutorial we have learnt how to convert data from one type to another. What is meant by implicit explicit conversin and How to convert strings to numbers.
Slide 7Assignment	As an assignment for this tutorial Read about Integer.toString and Float.toString. Find out What do they do?
Slide 8About the Spoken Tutorial Project Watch the video available at[1]http://spoken-tutorial.org/What_is_a_Spoken_Tutorial It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it	To know more about the Spoken Tutorial project, watch the video available at the following link, that summarises the project. if you do not have good bandwidth, you can download and watch it
Slide 9Spoken Tutorial WorkshopsThe Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates for those who pass an online test For more details, please write to contact@spoken-tutorial.org	The Spoken Tutorial Project Team. Conducts workshops using spoken tutorials and gives certificates for those who pass an online test. For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
Slide 10Acknowledgement Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at http://spoken-tutorial.org/NMEICT-Intro	Spoken Tutorial Project is a part of the Talk to a Teacher project and is supported by the National Mission on Education through ICT, MHRD, Government of India. More information on this Mission is available at spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro
Slide 11About the contributor This tutorial has been contributed by TalentSprint www.talentsprint.com Thanks for joining	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Chandrika, Sneha