ch 4 조건문과 반복문 _ 알고리즘

백준 2884 알람시계 

 

www.acmicpc.net/problem/2884

2884번: 알람 시계

 

 

 

 

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백준 2753 윤년

 

www.acmicpc.net/problem/2753

2753번: 윤년

import java.util.*;
public class yun {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		
		int yun = sc.nextInt();
		
		if (yun%4==0 && yun%100!=0)
		{
			System.out.println("1");
		}
		else if (yun%400 == 0)
		{
			System.out.println("1");
		}
		else
			System.out.println("0");

	}

}

 

 

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백준 8393

 

www.acmicpc.net/problem/8393

8393번: 합

 

import java.util.*;
public class hap {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int num = sc.nextInt();
		int sum=0;
		
		for( ; num>=1 ; num--)
		{
			sum=sum+num;
			
		}
		System.out.print(sum);


	}

}

 

 

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백준 2348

 

www.acmicpc.net/problem/2438

2438번: 별 찍기 - 1

import java.util.*;
public class star1 {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int num = sc.nextInt();
		int i = 0;
		
		for( int j=1; j<=num ; j++)
		{
			i=i+j;
			for(; i>0 ; i--)
			{
				System.out.print("*");
			}
			
			System.out.println();
		}
		

	}

}

 

 

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백준 2349 

 

www.acmicpc.net/problem/2439

2439번: 별 찍기 - 2

 

import java.util.*;
public class star1 {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int num = sc.nextInt();

		for(int i=1 ; i<=num ; i++)
		{
			for( int j =1 ; j<=num-i ; j++)
			{
				System.out.print(" ");
			}
			
			for(int a= 0 ; a<i ; a++)
			{
				System.out.print("*");
			}
			
			System.out.println();
		}
	
	}

}

 

 

 

백준 10951

 

www.acmicpc.net/problem/10951

10951번: A+B - 4

 

import java.util.*;
public class ab {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a, b;
		while(sc.hasNextInt())
		{
			a=sc.nextInt();
			b=sc.nextInt();
			System.out.println(a+b);
		}
	
	}

}