./test.cpp: In function 'int main()':
./test.cpp:7:5: error: 'cin' was not declared in this scope
cin >>a>>b;
^
./test.cpp:7:5: note: suggested alternative:
In file included from ./test.cpp:1:0:
/usr/include/c++/5/iostream:60:18: note: 'std::cin'
extern istream cin; /// Linked to standard input
^
./test.cpp:9:5: error: expected ';' before numeric constant
1<=b<=2147483647
^
./test.cpp:10:14: error: expected '}' at end of input
cout<<a+b;
^