Java 程序语言设计第二章Java语言基础 Java程序中的基本输入/输出?输出:(); (); ?输入:1、字符;2、字符串;3、数值;import .*;public class AppCharInOut {public static void main(String[] args) {char c = ' ';try{c = (char) ();}catch(IOException e){}}}import .*;public class AppLineInOut {public static void main(String[] args) {String s = "";try{BufferedReader in = new BufferedReader(new InputStreamReader( ) ); s = ();}catch(IOException e){}}}import .*;public class AppNumInOut { public static void main(String[] args) {String s = "";int n = 0;try{BufferedReader in = new BufferedReader( new InputStreamReader( ) );s = ();n = ( s );}catch(IOException e){}}}import .*;public class AppNumInOut { public static void main(String[] args) {String s = "";int n = 0;double d = 0;try{BufferedReader in = new BufferedReader(new InputStreamReader( ) );s = ();n = ( s );s = ();d = ( s );}catch(IOException e){}("You have entered: " + n + " and " + d ); }}练习?输入两个整型数,求两个数的和。?输入两个浮点型数,求两个数的最大值。?输入一个数,求它的阶乘。 数据类型、变量和常量?基本数据类型:P36 表3-1布尔(逻辑)型:boolean字符型:char整型:byte,short,int,long浮点型:double,float? 数据类型?基本数据类型——逻辑型逻辑型的关键字是boolean,在机器中占一位,有true和false两种取值,默认值为false。例如:boolean ispass=true;注意:java中的布尔值不能与其他数字进行转换! 数据类型?基本数据类型——(1)、short(2) 、int(4) 、long(8),与具体的软硬件平台无关。,所有均为有符号的!
