View Compilation Error

31127_0_26865.cpp
31127_0_26865.cpp(18) : warning C4508: 'main' : function should return a value; 'void' return type assumed
31127_0_26865.cpp(21) : error C2059: syntax error : '{'
31127_0_26865.cpp(21) : error C2143: syntax error : missing ';' before '{'
31127_0_26865.cpp(27) : error C2065: 'ab' : undeclared identifier