2745: 진법 변환

www.acmicpc.net/problem/2745

2745번: 진법 변환

진법 변환2와 반대로 수행하면 된다.

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import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int ans = 0;
        String n = scan.next();
        int b = scan.nextInt();
        for(int i=0; i<n.length(); i++) {
            if('0' <= n.charAt(i) && '9'>=n.charAt(i))
                ans = ans*b+(n.charAt(i)-'0');
            else
                ans = ans*b+(n.charAt(i)-'A'+10);
        }
        System.out.println(ans);
    }
}