Java Tutotrial for [NLP-AI] 2 ashishfa@cse.iitb.ac.in 4 December 2018

Last Assignment ? Print the details in tabular format - use tabs \t asgn1 asgn2 Last Assignment ? Print the details in tabular format - use tabs \t System.out.println("\"Can we print '\\' with System.out.println() statement?\"" ); 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Storing data In Java, Data can be stored as Numbers 2, 6.67, 0.009 Characters ‘c’, ‘p’, ‘?’, ‘2’ Strings “data”, “Hindi language”, “$99”, “www.rediff.com” 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Program int1 int2 // this program will declare and print a number class int2 { public static void main(String[] arguments) int weight = 68; System.out.println("your weight is " + weight); } //end of program 4 December 2018 Java Tutorial series part 2

Comments(double slash) Not executed For documentation Can be placed on any line Anything written after // is not executed E.g. // this is a comment Used to explain/describe what is done in the program Good practice 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Types of numbers float1 int Whole numbers like 0, 575, -345 etc. double Numbers with decimal point like 12.453, 3.432, 0.0000002 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Variable declaration Before using any name, it must be declared (with its type i.e int or double). Needed only once in one program Generally, done initially Syntax datatype name; double total; // stores the total value int index; int a,b , c, sum, interest; 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Assignment int3 int5 int a; //declaration – needed once a = 10 ; // assignment … declared above int a = 10; // assignment and declaration together 10 = a ; // not possible – compilation error Left hand side is always a variable for assignment Storage area a 10 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Assignment… int4 int a , b ; a = 4; b = 7; a = b; b = a; a = 5; // a =? b = ? // a = 4 b = ? // a = 4 b = 7 // a = 7 b = 7 // a = 7 b = 7 // a = 5 b = 7 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Character data char1 char2 Characters ‘a’, ‘A’, ‘c’ , ‘?’ , ‘3’ , ‘ ’ (last is the single space) Enclosed in single quotes Character variable declaration char ch; Character assignment ch = ‘k’; 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 string1 string2 string3 String data Strings are sequence of characters enclosed in double quotes Declaration String name; String address; String line; Assignment name = “ram”; line = “this is a line with spaces”; name = “a”; // single character can be stored name = “”; // empty string The sequence of characters enclosed in double quotes, printed in println() are also strings. E.g. System.out.println( “Welcome ! “ ); 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Practice problem Try to print these two figures on the screen using println and least number of strings ******* ***** *** * ********** * * 4 December 2018 Java Tutorial series part 2

Java Tutorial series part 2 Thank you 4 December 2018 Java Tutorial series part 2