백준 코딩테스트 3-3-8393 합 코딩 문제 java로 푸는 방법

 

 

 

백준 코딩테스트 단계별로 풀어보기

3단계 반복문 3단계 8393 합 문제입니다

 

 

https://www.acmicpc.net/problem/8393

8393번: 합

 

https://www.acmicpc.net/step

단계별로 풀어보기

 

 

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문제
n이 주어졌을 때, 1부터 n까지 합을 구하는 프로그램을 작성하시오.

입력
첫째 줄에 n (1 ≤ n ≤ 10,000)이 주어진다.

출력
1부터 n까지 합을 출력한다.

 

 

정답

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();

 

int sum = 0;

 

for (int i=1; i<=n; i++) {

sum+=i;

}

System.out.println(sum);

}

}

 

=>

오답

 import java.util.Scanner;

public class Test03_03_8393 {

public static void main(String[] args) {

 

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

sc.close();

 

int sum = 0;

 

for (int i=1; i<=n; i++) {

n+=n+1;

}

System.out.println(n);

}

}

이 코드로 돌리면 아래와 같이 오류가 난다

자료형 문제

 

 

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2-5-2884 알람 시계 https://developernew.tistory.com/68
2-6-2525 오븐 시계 https://developernew.tistory.com/69
2-7-2480 주사위 https://developernew.tistory.com/72

3-1-2739 구구단 https://developernew.tistory.com/73
3-2-10950 A+B - 3 https://developernew.tistory.com/75