c语言结构体missing ';' before '.',一道结构体的题目， 麻烦帮看一下我的程序

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这是错误原因， 我不会改啊

--------------------Configuration: sdfdfdf - Win32 Debug--------------------

Compiling...

sdsdsd.cpp

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(23) : error C2065: 'student' : undeclared identifier

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(23) : error C2109: subscript requires array or pointer type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(23) : error C2228: left of '.num' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(24) : error C2143: syntax error : missing ')' before '.'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(24) : error C2540: non-constant expression as array bound

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(24) : error C2059: syntax error : ')'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.num' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.name' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.sex' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.score_M' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.score_E' must have class/struct/union type

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2275: 'Student' : illegal use of this type as an expression

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(3) : see declaration of 'Student'

c:program filesmicrosoft visual studiomyprojectssdfdfdfsdsdsd.cpp(25) : error C2228: left of '.score_P' must have class/struct/union type

Error executing cl.exe. sdsdsd.obj - 18 error(s), 0 warning(s)