View Compilation Error

30305_0_5300.cpp
30305_0_5300.cpp(4) : error C2065: 'cin' : undeclared identifier
30305_0_5300.cpp(6) : error C2296: '>>' : illegal, left operand has type 'float'
30305_0_5300.cpp(6) : error C2297: '>>' : illegal, right operand has type 'float'
30305_0_5300.cpp(26) : error C2065: 'printf' : undeclared identifier
30305_0_5300.cpp(28) : error C2065: 'cout' : undeclared identifier
30305_0_5300.cpp(28) : error C2065: 'endl' : undeclared identifier
30305_0_5300.cpp(28) : warning C4552: '<<' : operator has no effect; expected operator with side-effect