흥미로운 IT

[문제]

John got a bad mark in math. The teacher gave him another task. John is to write a program which computes the sum of integers from 1 to n. If he manages to present a correct program, the bad mark will be cancelled.

Write a program which:

• reads the number n from the standard input,
• computes the sum of integers from 1 to n,
• writes the answer to the standard output.

[입력]

The first and only line of the standard input contains one integer n (1 ≤ n ≤ 10 000).

[출력] 

One integer is to be written to the standard output. This integer should be the sum of integers from 1 to n.

다시 말해,  n을 입력받았을 때, n까지의 합을 구하는 프로그램을 작성하는 것.

for문을 통해서 다음과 같이 간단히 작성할 수 있다.

[코드 작성]

출처: Contest > Algorithmic Engagements > PA 2006 0-1번
출처: https://www.acmicpc.net/problem/1016