Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
115051 谭哲曦 13求1+2-3+4-5+……n的值 C++ Compile Error 0 MS 0 KB 258 2025-03-27 22:33:14

Tests(0/0):

Code:

#include <iostream> uing namespace std; int main() { int n ,sum = 1; cin >> n; for(int i=2;i < = n;i++) { if( i%2 == 0) sum +=i; else sum -=i; } cout<< sum <<endl; return 0; }

Run Info:

Main.cc:2:1: error: 'uing' does not name a type
 uing namespace std;
 ^
Main.cc: In function 'int main()':
Main.cc:6:5: error: 'cin' was not declared in this scope
     cin >> n;
     ^
Main.cc:6:5: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/5/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
Main.cc:7:21: error: expected primary-expression before '=' token
     for(int i=2;i < = n;i++)
                     ^
Main.cc:14:5: error: 'cout' was not declared in this scope
     cout<< sum <& __os)
     ^