[JAVA] 백준 단계별로 풀어보기_3단계(for문)

2739번: 구구단

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int num = sc.nextInt();

        for (int i = 1; i < 10; i++) {
            System.out.println(num + " * " + i + " = " + num * i);
        };
    }
}

10950번: A+B-3

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int num = sc.nextInt();

        for (int i = 0; i < num ; i++) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            System.out.println(a + b);
        }
    }
}

8393번: 합

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int sum = 0;

        for (int i = 0; i <= n ; i++) {
            sum = sum + i;
            if (i == n) {
                System.out.println(sum);
            }
        }
    }
}

2741번: N찍기

import  java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for (int i = 1; i <= n; i++) {
            System.out.println(i);
        }
    }
}

2742번: 기찍N

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for (int i = 1; i <= n; i++) {
            System.out.println((n + 1) - i);
        }
    }
}

11021번: A+B-7

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        for (int i = 1; i <= n ; i++) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            System.out.println("Case #" + i + ": " + (a + b));
        }
    }
}

11022번: A+B-8

import  java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int T = sc.nextInt();

        for (int i = 1; i <= T; i++) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            System.out.println("Case #" + i + ": " + a + " + " + b + " = " + (a + b));
        }
    }
}

2438번: 별 찍기-1

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        sc.close();

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

2439번: 별 찍기-2

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        sc.close();

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

10871번: X보다 작은 수

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        int X = sc.nextInt();

        StringBuilder sb = new StringBuilder();

        for (int i = 1; i <= N; i++) {
            int A = sc.nextInt();

            if (A < X) {
                sb.append(A + " ");
            }
        }
        System.out.print(sb);
    }
}