[java] 백준 단계별로 풀어보기 1단계 (2)

6단계 1001번 A - B

import java.util.Scanner;

class Main {
    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        System.out.print(a-b);
    }
}

7단계 10998번 A X B

import java.util.Scanner;

class Main {
    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        System.out.println(a*b);
    }
}

8단계 1008번 A / B

import java.util.Scanner;

class Main {
    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        System.out.println((double)a/b);
    }
}

9단계 10869번 사칙연산

import java.util.Scanner;

class Main{
    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/b);
        System.out.println(a%b);
    }
}

10단계 10430번 나머지

import java.util.Scanner;

class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        System.out.println((a+b)%c);
        System.out.println(((a%c)+(b%c))%c);
        System.out.println((a*b)%c);
        System.out.println(((a%c)*(b%c))%c);
    }
}

11단계 2588번 곱셈

import java.util.Scanner;
import java.lang.Math;

class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = 0;

        int[] arr = new int[3];
        int[] arr2 = new int[3];
        int[] tot = new int[3];

        for(int i=2; i>-1; i--){
            arr[i] = b/(int)Math.pow(10,i);
            b-=arr[i]*(int)Math.pow(10,i);
        }
        arr2[0] = arr[2];
        arr2[1] = arr[1];
        arr2[2] = arr[0];
        for(int j=2; j>-1; j--)
            tot[j] = a*arr2[j];
        for(int i=2; i>-1; i--)
            System.out.println(tot[i]);
        arr2[0] = tot[2];
        arr2[1] = tot[1];
        arr2[2] = tot[0];
        for(int i=2; i>-1; i--) {
            c += arr2[i] * (int) Math.pow(10, i);
        }
        System.out.println(c);
    }
}

2588번 헬파티입니다...