Main.cc: In function 'int main()':
Main.cc:7:5: error: 'longlong' was not declared in this scope
longlong n=(longlong)a+b*10;
^
Main.cc:8:14: error: expected ';' before 'r'
longlong r=n*n;
^
Main.cc:9:11: error: 'r' was not declared in this scope
cout<