package java02;
import java.util.Scanner;
public class ex02_01_면적구하기 {
public static void main(String[] args){
int w = 0;
int h = 0;
int area = 0;
int perimeter = 0;
Scanner keyboard = new Scanner(System.in);
System.out.print( "가로 입력:" );
w = keyboard.nextInt();
System.out.print( "세로 입력:" );
h = keyboard.nextInt();
keyboard.close();
area = w * h;
perimeter = 2 * ( w + h );
System.out.println();
System.out.println( "면적:"+ area );
System.out.println( "둘레:"+ perimeter );
}
}
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package java02;
public class jv02_08_문자와문자열 {
public static void main(String[] args) {
char ch1 = '가';
System.out.println( ch1 );
char ch2 = '\uac00';
System.out.println( ch2 );
String s = "Hello World!";
System.out.println( s );
}
}
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package java02;
public class jv02_09_문자열결합 {
public static void main(String[] args) {
int i = 10, j = 2;
int sum = i + j;
// 더하기 : 10 + 20 = 30 출력하기
System.out.println("더하기: " + i + "+" + j + "=" + sum );
String s1 = "Hello";
String s2 = " World";
System.out.println( s1 + s2 );
String s3 = s1 + s2;
System.out.println(s3);
}
}
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package java02;
public class jv02_10_산술연산과정 {
public static void main(String[] args) {
int x = 2;
int y = 3;
int sum = x+y;
System.out.println( "x + y = " + sum );
}
}
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package java02;
public class jv02_11_산술연산자 {
public static void main(String[] args) {
int x = 4;
int y = 5;
int result = 0;
result = x + y;
System.out.println( result ); // 출력: 더하기 = 9
result = x - y;
System.out.println( result );
result = x * y;
System.out.println( result );
result = x / y;
System.out.println( result );
result = x % y;
System.out.println( result );
}
}
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package java02;
public class jv02_11_ASCII코드 {
public static void main(String[] args) {
int x = '4';
int y = '5';
int result = 0;
System.out.println( "4의 ASCII코드 = " + x );
System.out.println( "5의 ASCII코드 = " + y + "\n");
result = x + y;
System.out.println( "더하기 = " + result ); // 출력: 더하기 = 9
result = x - y;
System.out.println( "빼기 = " + result );
result = x * y;
System.out.println( "곱하기 = " + result );
result = x / y;
System.out.println( "나누기 = " + result );
result = x % y;
System.out.println( "나머지 = " + result );
}
}
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package java02;
public class jv02_13_증감연산자 {
public static void main(String[] args){
int x = 0;
x++; // x = x+1;
System.out.println("++의 결과="+x); //1
x--; // x = x-1;
System.out.println("--의 결과="+x); //0
}
}
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package java02;
public class jv02_14_비교연산자 {
public static void main(String[] args){
// 정수 변수 선언 & 초기화
int x = 3;
int y = 4;
System.out.println( x == y );
System.out.println( x != y );
System.out.println( x > y );
System.out.println( x < y );
System.out.println( x >= y );
System.out.println( x <= y );
}
}
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package java02;
import java.util.Scanner;
public class jv02_16_비교논리결합 {
public static void main(String[] args){
// 정수 변수 선언 & 초기화
int x = 0;
int y = 0;
Scanner keyboard = new Scanner(System.in);
System.out.println("논리계산기");
System.out.println();
System.out.print("x값 입력:");
x = keyboard.nextInt();
System.out.print("y값 입력:");
y = keyboard.nextInt();
keyboard.close();
System.out.println();
System.out.println("x의 값:"+x+" y의 값:"+y);
System.out.println();
System.out.print("(x == y)&&(x != y) ▶ ");
System.out.println((x == y)&&(x != y));
System.out.print("(x > y)||(x < y) ▶ ");
System.out.println((x > y)||(x < y));
System.out.print("(x >= y)||(x <= y) ▶ ");
System.out.println((x >= y)||(x <= y));
System.out.print("(x == y)&&(x != y)||(x < y) ▶ ");
System.out.println((x == y)&&(x != y)||(x < y));
}
}
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package java02;
public class jv02_ex_03 {
public static void main(String[] args){
int x = 1;
int y = 1;
int a = ++x * 2;
int b = y++ * 2;
System.out.println( a );
System.out.println( b );
}
}
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