2025-2026 오성고_공동교육_정보과학 Day 1

algo1_forloop.py

def main():
  n = int(input("숫자를 입력하세요: "))
  total = 0
  
  for i in range(1, n + 1):
      total += i
      
  print("합계:", total)
  
if __name__ == "__main__":
  main()

algo2_whileloop.py

def main():
  n = int(input("숫자를 입력하세요: "))
  total = 0
  
  i = 1
  while i <= n:
      total += i
      i += 1
      
  print("합계:", total)
  
if __name__ == "__main__":
  main()

algo3_sigma.py

def main():
  n = int(input("숫자를 입력하세요: "))
  total = n * (n + 1) // 2
  
  print("합계:", total)
  
if __name__ == "__main__":
  main()

algo4_defaultfn.py

def main():
  n = int(input("숫자를 입력하세요: "))
  total = sum(range(1, n + 1))

  print("합계:", total)
  
if __name__ == "__main__":
  main()