[파워자바] 6장 프로그래밍 솔루션 답지

1.

import java.util.*;
public class Test
{
	public static void main(String[] args){
		int x, y, z, min;
		Scanner scan = new Scanner(System.in);
		System.out.print("정수를 입력하세요");
		x = scan.nextInt();
		System.out.print("정수를 입력하세요");
		y = scan.nextInt();
		System.out.print("정수를 입력하세요");
		z = scan.nextInt();
		
		if( x < y ){
			if( x < z ){
				if( y < z )
					System.out.println(x+" "+y+" "+z);
				else
					System.out.println(x+" "+z+" "+y);
			}
			else {
				if( y < x )
					System.out.println(z+" "+y+" "+x);
				else
					System.out.println(z+" "+x+" "+y);
			}
		}
		else {
			if( y < z ){
				if( x < z )
					System.out.println(y+" "+x+" "+z);
				else
					System.out.println(y+" "+z+" "+x);
			}
			else {
				if( y < x )
					System.out.println(z+" "+y+" "+x);
				else
					System.out.println(z+" "+x+" "+y);
			}
		}
	}
}

 

2.

import java.util.*;
public class Test
{
	public static void main(String[] args){
		String s;
		Scanner scan = new Scanner(System.in);
		System.out.print("문자를 입력하세요");
		s = scan.next();
		char c = s.charAt(0);
		switch(c){
			case 'a':
			case 'i':
			case 'o':
			case 'u':
			case 'e':
				System.out.println("모음입니다.");
				break;
			default: 
				System.out.println("자음입니다.");
		}
	}
}

 

3.

import java.util.*;
public class Weight {
	public static void main(String[] args){
		double weight, stWeight, height;
		Scanner scan = new Scanner(System.in);
		System.out.println("키를 입력하세요");
		height = scan.nextDouble();
		System.out.println("몸무게를 입력하세요");
		weight = scan.nextDouble();
		stWeight = (height-100) * 0.9;
		if(weight < stWeight)
			System.out.println("저체중입니다.");
		else if(weight == stWeight)
			System.out.println("표준입니다.");
		else
			System.out.println("과체중입니다.");
	}
}

 

4.

import java.util.*;
public class Test
{
	public static void main(String[] args){
		int x, y, z, min;
		Scanner scan = new Scanner(System.in);
		System.out.print("정수를 입력하세요");
		x = scan.nextInt();
		System.out.print("정수를 입력하세요");
		y = scan.nextInt();
		System.out.print("정수를 입력하세요");
		z = scan.nextInt();
		if( x < y ){
			if( z < x ) 
				min = z;
			else
				min = x;
		}
		else {
			if( z < y ) 
				min = z;
			else
				min = y;
		}
		System.out.printf("제일 작은 정수는 %d입니다. \n", min);
	}
}

 

5.

import java.util.*;
public class Function {
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		double x;
		x = scan.nextDouble();
		if(x <= 0)
			System.out.println("함수값은 " + ((x*x*x) - (9*x) + 2) + "입니다.");
		else
			System.out.println("함수값은 " + ((7*x) + 2) + "입니다.");
	}
}

 

6.

public class PrimeNumber {
	public static void main(String[] args){
		int count2 = 0;
		System.out.print("2부터 100사이 모든 소수 : ");
		for(int i = 2; i <= 100; i++){
			count2 = 0;
			for(int k = 2; k < i; k++){
				if((i%k) == 0){
					count2++;
					break;
				}
			}
			if(count2 == 0)
				System.out.print(" " + i);
		}
	}
}

7.

import java.util.*;
public class Test
{
	public static void main(String[] args){
		int a, b, c;

		for(a=1; a<=100; a++)
		{ 
			for(b=1; b<=100; b++)
			{ 
				for(c=1; c<=100; c++)
				{ 
					if( (a*a+b*b)==c*c )
						System.out.printf("%d %d %d\n", a, b, c);
				}
			}
		}
	}
}

 

8.

import java.util.*;
public class Test
{
	public static void main(String[] args){
		int a, b;

		for(a=1; a<=10; a++)
		{ 
			for(b=1; b<=10; b++)
			{ 
				System.out.printf("%d ", a*b);
			}
			System.out.println("");
		}
	}
}

 

9.

import java.util.*;
public class Cal {
	public static void main(String[] args){
		String a;
		double num1, num2;
		Scanner s = new Scanner(System.in);
		System.out.println("문자를 입력하세요:");
		a = s.nextLine();
		System.out.println("숫자 2개를입력하세요:");
		num1 = s.nextDouble();
		num2 = s.nextDouble();
		if(a.equals("+")){
			System.out.println(num1 + "+" + num2 + " = "+(num1 + num2));
		}
		else if(a.equals("-")){
			System.out.println(num1 + "-" + num2 + " = "+(num1 - num2));
		}
		else if(a.equals("*")){
			System.out.println(num1+ "*" +num2 + " = "+(num1 * num2));
		}
		else{
			if(num2 != 0)
				System.out.println(num1 + "/" + num2 + " = "+(num1 / num2));
			else
				System.out.println("0으로 나눌수 없습니다.");
		}
	}
}

 

10.

import java.util.*;
public class Fibo {
	public static void main(String[] args){
		int n;
		int f0 = 0, f1 = 1, f2;
		Scanner s = new Scanner(System.in);
		System.out.println("출력할 숫자 개수");
		n = s.nextInt();
		System.out.print("0 1");
		for(int i = 3; i <= n; i++){
			f2 = f1 + f0;
			f0 = f1;
			f1 = f2;
			System.out.print(" " +f2);
		}
	}
}