运行 ID: 129536

Main.cc:1:1: error: ‘nclude’ does not name a type
 nclude 
 ^~~~~~
Main.cc: In function ‘int main()’:
Main.cc:2:53: error: ‘cin’ was not declared in this scope
 using namespace std; int main() { double a, b, c=0; cin>>a; for(int i=1;i<=a;i++) {
                                                     ^~~
Main.cc:2:53: note: suggested alternative: ‘main’
 using namespace std; int main() { double a, b, c=0; cin>>a; for(int i=1;i<=a;i++) {
                                                     ^~~
                                                     main
Main.cc:5:3: error: ‘printf’ was not declared in this scope
 } printf("%.2f", c/a); return 0; }
   ^~~~~~
Main.cc:5:3: note: suggested alternative: ‘int’
 } printf("%.2f", c/a); return 0; }
   ^~~~~~
   int