Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
1202 Kevin Jiang 13求1+2-3+4-5+……n的值 C++ Compile Error 0 MS 0 KB 181 2023-08-22 11:51:26

Tests(0/0):

Code:

#include<iostream> using namespace std; int main(){ int a=0; cin>>a; if(a==0) cout<<0; else if(a&2==0) cout<<3+(n-2)/2; else cout<<1-(n-1)/2; } return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:7:11: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  else if(a&2==0)
           ^
Main.cc:8:12: error: 'n' was not declared in this scope
   cout<3+(n-2)/2; 
            ^
Main.cc:10:12: error: 'n' was not declared in this scope
   cout<<1-(n-1)/2; 
            ^
Main.cc: At global scope:
Main.cc:12:2: error: expected unqualified-id before 'return'
  return 0;
  ^
Main.cc:13:1: error: expected declaration before '}' token
 } 
 ^