Mã chấm: 268535

Main.cc: In function ‘int main()’:
Main.cc:7:7: error: expected ‘;’ before numeric constant
     3 4 3
       ^
Main.cc:14:14: warning: statement has no effect [-Wunused-value]
     int a = 1;
              ^
Main.cc:17:5: error: ‘cout’ was not declared in this scope
     cout << "a+b= " << a + b << endl;
     ^~~~
Main.cc:17:5: note: suggested alternative: ‘cosl’
     cout << "a+b= " << a + b << endl;
     ^~~~
     cosl
Main.cc:17:24: error: ‘a’ was not declared in this scope
     cout << "a+b= " << a + b << endl;
                        ^
Main.cc:17:33: error: ‘endl’ was not declared in this scope
     cout << "a+b= " << a + b << endl;
                                 ^~~~
Main.cc:17:33: note: suggested alternative: ‘ynl’
     cout << "a+b= " << a + b << endl;
                                 ^~~~
                                 ynl
Main.cc:27:11: error: expected ‘;’ before numeric constant
         1 2 2 3
           ^
Main.cc:31:13: warning: statement has no effect [-Wunused-value]
     return 0;
             ^
Main.cc: At global scope:
Main.cc:33:1: error: ‘Xin’ does not name a type; did you mean ‘sin’?
 Xin loi thay nhieu em hong biet lam :((
 ^~~
 sin