src.cpp:2:7: error: expected nested-name-specifier before 'namesapce'
using namesapce std;
^
src.cpp: In function 'int main()':
src.cpp:5:5: error: 'cin' was not declared in this scope
cin>>a>>b;
^
src.cpp:6:5: error: 'cout' was not declared in this scope
cout<<a*b<<"/n"<<a+b;
^