1. Byung-Hyun Ha bhha@pusan.ac.kr
프로그래밍 실습 #1
Byung-Hyun Ha

2. 정수를 사용한 연산: 섭씨를 화씨로 import java.util.Scanner; public class Temp {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Temp. in degree Celsius? ");
int c = s.nextInt();
int f = c * 9 / ;
System.out.println("It's " + f + " deg. F."); }

3. 실수를 사용한 연산: 섭씨를 화씨로 import java.util.Scanner; public class Temp {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Temp. in degree Celsius? ");
double c = s.nextDouble();
double f = c * 9 / ;
System.out.println("It's " + f + " deg. F."); }

4. 실수에 관하여 import java.util.Scanner; public class Big {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
double n = s.nextDouble();
for (int i = 0; i < 10000; i++) {
n = n ; }
System.out.println("Result: " + n);

5. 실수에 관하여 1을 입력해보자 10000000000을 입력해보자 (동그라미가 10개)
어떤 결과 vs. 실제 결과
을 입력해보자 (동그라미가 10개)
을 입력해보자 (동그라미가 15개)

6. 문자열 import java.util.Scanner; public class Name {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Name? ");
String name = s.nextLine();
int n = name.indexOf(' ');
String sir = name.substring(0, n);
String given = name.substring(n + 1, name.length());
System.out.print("Sir name is " + sir +
" and given name is " + given); }

7. Java 2 Platform API Specification

8. 반올림: 잘못된 프로그램 import java.util.Scanner; public class Round {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
double n = s.nextDouble();
double r = (int)(n + 0.5);
System.out.println(n + " is rounded off to " + r); }

9. 반올림 import java.util.Scanner; public class Round {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
double n = s.nextDouble();
double r = Math.floor(n + 0.5);
System.out.println(n + " is rounded off to " + r); }

10. 약수1 import java.util.Scanner; public class Divisor {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
int n = s.nextInt();
for (int i = 1; i <= n; i++) {
if ((n % i) == 0) {
System.out.print(i + " "); }

11. 약수2 import java.util.Scanner; public class Divisor {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
int n = s.nextInt();
for (int i = 1; i <= n; i++) {
if ((n / i * i) == n) {
System.out.print(i + " "); }

12. 소수 (Prime Number) import java.util.Scanner; public class Prime {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number? ");
int n = s.nextInt();
boolean isPrime = true;
for (int i = 2; i < n; i++) {
if (n / i * i == n) {
isPrime = false;
break; }
if (isPrime) {
System.out.println("Prime Number");
} else {
System.out.println("Not Prime Number");

13. 숫자 피라미드 출력 Input number (less than 10)? 6 010 01210 0123210 012343210
010
01210

14. 숫자 피라미드 출력 import java.util.Scanner; public class Pramid {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Input number (less than 10)? ");
int n = s.nextInt();
for (int i = 0; i <= n; i++) {
for (int j = 0; j < n - i; j++) {
System.out.print(' '); }
for (int j = 0; j <= i; j++) {
System.out.print(j);
for (int j = i - 1; j >= 0; j--) {
System.out.println();

15. 숫자 n개 입력 (999를 입력하면 끝) import java.util.Scanner; public class InputN {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
int[] ns = new int[1000];
int count = 0;
for (int i = 0; i < 1000; i++) {
System.out.print((i + 1) + "'th: ");
ns[i] = s.nextInt();
if (ns[i] == 999) {
count = i;
break; }
System.out.print("Your input: ");
for (int i = 0; i < count; i++) {
System.out.print(ns[i] + " ");

16. 정렬 public class Sort { public static void main(String[] args) {
int[] ns = {4, 5, 1, 7, 1, 3};
for (int i = 0; i < ns.length - 1; i++) {
for (int j = i + 1; j < ns.length; j++) {
if (ns[i] > ns[j]) {
int temp = ns[i];
ns[i] = ns[j];
ns[j] = temp; }
System.out.println("Result: ");
for (int i = 0; i < ns.length; i++) {
System.out.print(ns[i] + " ");

17. 빈도수 구하기 public class Frequency {
public static void main(String[] args) {
int[] ns = {4, 5, 1, 7, 1, 3, 1, 3, 1, 4};
int[] frequency = new int[20];
for (int i = 0; i < 20; i++) {
frequency[i] = 0; }
for (int i = 0; i < ns.length; i++) {
frequency[ns[i]]++;
System.out.println(i + ": " + frequency[i]);