View Compilation Error

0_0_36350429_20116.cpp: In function 'int main()':
0_0_36350429_20116.cpp:6:5: error: expected initializer before 'long'
     long long n;
     ^
0_0_36350429_20116.cpp:7:6: error: 't' was not declared in this scope
 cin>>t;
      ^
0_0_36350429_20116.cpp:10:6: error: 'n' was not declared in this scope
 cin>>n;
      ^
0_0_36350429_20116.cpp:11:18: error: 'ednl' was not declared in this scope
 cout<<(n+1)*n/2<<ednl;
                  ^