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1 ( 2 ( ) ( ) Ruby Java Java Java ( Web Web / ( ( 3 : ( (Q&A) ( ) 1

2 : Q&A : : Java ( / ( Java ) ( ) 2

3 ( ) ( 1 0.1Kg ) 13.2Kg 1: ( Kg Kg Kg 100,000 (1t 2 0/ : 12 1 (bit) 2 1 (binary digit) 2 1 3

4 0 1 1 / N 2 N ( ) / / 1.3 (model) ( ) / (? 10cm 8cm cm 5cm = 40(cm 2 ) = 15(cm 2 ) : 4

5 ( ( ) 10cm 8cm 1.4 ( ) (algorithm) 2 3 ( ) ( ) 5

6 : w h s w+h 2 s 1.5 / s w+h 2 ( w h 2 s s = w+h 2 h = 2s w ( = ) ( ) ( Java Java C C++ 6

7 2.2 Java w Java : import java.io.*; public class Sample1 { public static void main(string[] args) throws Exception { BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); System.out.print("w = "); double w = (new Double(in.readLine())).doubleValue(); System.out.print("h = "); double h = (new Double(in.readLine())).doubleValue(); double s = (w * h) / 2.0; System.out.println("s = " + s); } } 1. Java 1 public class {... } 2. main ( ) public class { public static void main(string[] args) throws Exception {... } } 3. 1 Java BufferedReader 1 java.io import java.io.*; ( ) BufferedReader in import java.io.*; public class { public static void main(string[] args) throws Exception { BufferedReader in = new BufferedReader(new InputStreamReader(System.in));... } } BufferedReader 1 InputStreamReader InputStreamReader System.in InputStream 4. System.out.print("w = "); System.out.print(...) ; 1 7

8 5. 1 f ( double w = (new Double(in.readLine())).doubleValue(); w h s double s = (w * h) / 2.0; Java 1 / 1 * % ( ) 7. System.out.println(...) System.out.print(...) System.out.println("s = " + s); + ("...") ( ) 2.3! Terminal (Emacs ) Sample1.java Java.java ( ) Java javac ( % javac Sample1.java % % ( Sample1.class java java 8

9 % java Sample1 w = 5 h = 7 s = 17.5 % "..." System.out.println 2! - ( _ Sample1 1 Sample1 1.java 3 a. 2 b. 2 ( c. d. e. x x 10 x 0.1 ( f. x x ( g. x y x % y ( h. x Math.sqrt(x) 2.4 : Java 2 ( ) ( ) ( ) Java ( ) ; = ; 9

10 int( char( float( double( ( ) boolean Boolean int Integer char Character float Float double Double String BufferedReader ( ) 1 InputStreamReader 1 InputStream PrintStream 2 System.in InputStream System.out PrintStream new new (...) BufferedReader readline() 1 (String ). ( ). ( ) double w = (new Double(in.readLine())).doubleValue(); in.readline() in BufferedReader readline() ( ) 1 String ( ) new Double(...) String Double (...).doublevalue() Double double(!) double f =... w / 10

11 3 3.1 / ( ) (I II III IV IX X XI XII ) (0 9 ) ( 0 9 ) ( ) : ( ) 10 0 = = = ( ) ( 10?) ( 120 (3) = = 15 (10) ( ) / (2) 10 : = 8 (10) + 2 (10) = 10 (10) 3.2 N 0 2 N 1 ( ) 1 ( 1) 3 : / / p p 11

12 ( ) = = (1)001 ( 1 ) 0/ / (overflow) ( 4 Java (int) 32 2 Java int int x = new Integer(in.readLine()).intValue(); int double double int 4 6 ( ) 3.3? ? 12

13 . 30,000, ( ) ( ) Java double 1 52 ( )11 64 ( IEEE754 Java ( ) ( 2 ( ) ( ( ) : 0 ( NaN (Not a Number double Java 13

14 : 6 double NaN -0 Java A 1A 3 ( 1 ) kuno@mail.ecc.u-tokyo.ac.jp 1. Subject: ASCII( ) Report 1A ( & ( 4. ( ) Q1.? 2? Q2. Java? Q3. B 1B 3 ( ) ( 1A

15 1. Subject: Report 1B Q1.? Q2.? Q3. C! ECC ( ECC ( ( ( 4 A ( A / / ( :? ) ( ) Subject: ^_^; Web PDF? 15

K227 Java 2

1 K227 Java 2 3 4 5 6 Java 7 class Sample1 { public static void main (String args[]) { System.out.println( Java! ); } } 8 > javac Sample1.java 9 10 > java Sample1 Java 11 12 13 http://java.sun.com/j2se/1.5.0/ja/download.html