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I would like to obtain information from a text file and assign that information into class objects


Why should the “PIMPL” idiom be used?Why does an overridden function in the derived class hide other overloads of the base class?Returning ints versus void“Undefined reference to” template class constructorWhy is 'int i = i;' legal?Turbo C++ and Code blocksFunction ambiguous in multiple inheritanceHow do I read from an input file after passing the ifstream object to a function?Passing Array of objects to same class C++a function-definition is not allowed here: void encryption(ifstream encrypt_file, ofstream keys_out, ofstream cipher_out) {






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;








-1















Why the compiler throw me error:invalid use of 'Student::Student'|



this is content file(ListOfStudent):1234 46567
this is my code:



class Student
string ML,MSV;
public:
 Student();
 Student(string ML,string MSV );
 ~Student();
 void Out();
;
int main()


 vector<Student>ListOfStudent;
 
 ifstream inf("ListOfStudentFile");
 Student st;
 while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 st.Student(ML,MSV);
 ListOfStudent.push_back(st);
 
 

 return 0;


Student::Student(string ML,string MSV)

 this->ML=ML;
 this->MSV=MSV;







c++ codeblocks







share|improve this question






















  • Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

    – R Sahu
    Mar 24 at 7:29











  • @RSahu In what way is the question not an MCVE?

    – john
    Mar 24 at 7:38











  • You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

    – R Sahu
    Mar 24 at 7:42












  • You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

    – πάντα ῥεῖ
    Mar 24 at 7:45


















-1















Why the compiler throw me error:invalid use of 'Student::Student'|



this is content file(ListOfStudent):1234 46567
this is my code:



class Student
string ML,MSV;
public:
 Student();
 Student(string ML,string MSV );
 ~Student();
 void Out();
;
int main()


 vector<Student>ListOfStudent;
 
 ifstream inf("ListOfStudentFile");
 Student st;
 while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 st.Student(ML,MSV);
 ListOfStudent.push_back(st);
 
 

 return 0;


Student::Student(string ML,string MSV)

 this->ML=ML;
 this->MSV=MSV;







c++ codeblocks







share|improve this question






















  • Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

    – R Sahu
    Mar 24 at 7:29











  • @RSahu In what way is the question not an MCVE?

    – john
    Mar 24 at 7:38











  • You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

    – R Sahu
    Mar 24 at 7:42












  • You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

    – πάντα ῥεῖ
    Mar 24 at 7:45














-1












-1








-1








Why the compiler throw me error:invalid use of 'Student::Student'|



this is content file(ListOfStudent):1234 46567
this is my code:



class Student
string ML,MSV;
public:
 Student();
 Student(string ML,string MSV );
 ~Student();
 void Out();
;
int main()


 vector<Student>ListOfStudent;
 
 ifstream inf("ListOfStudentFile");
 Student st;
 while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 st.Student(ML,MSV);
 ListOfStudent.push_back(st);
 
 

 return 0;


Student::Student(string ML,string MSV)

 this->ML=ML;
 this->MSV=MSV;







c++ codeblocks







share|improve this question














Why the compiler throw me error:invalid use of 'Student::Student'|



this is content file(ListOfStudent):1234 46567
this is my code:



class Student
string ML,MSV;
public:
 Student();
 Student(string ML,string MSV );
 ~Student();
 void Out();
;
int main()


 vector<Student>ListOfStudent;
 
 ifstream inf("ListOfStudentFile");
 Student st;
 while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 st.Student(ML,MSV);
 ListOfStudent.push_back(st);
 
 

 return 0;


Student::Student(string ML,string MSV)

 this->ML=ML;
 this->MSV=MSV;







c++ codeblocks




c++ codeblocks






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 24 at 7:23









KanKan

295




295












  • Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

    – R Sahu
    Mar 24 at 7:29











  • @RSahu In what way is the question not an MCVE?

    – john
    Mar 24 at 7:38











  • You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

    – R Sahu
    Mar 24 at 7:42












  • You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

    – πάντα ῥεῖ
    Mar 24 at 7:45


















  • Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

    – R Sahu
    Mar 24 at 7:29











  • @RSahu In what way is the question not an MCVE?

    – john
    Mar 24 at 7:38











  • You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

    – R Sahu
    Mar 24 at 7:42












  • You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

    – πάντα ῥεῖ
    Mar 24 at 7:45

















Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

– R Sahu
Mar 24 at 7:29





Please convert your code to a minimal reproducible example and post the complete error message from the compiler.

– R Sahu
Mar 24 at 7:29













@RSahu In what way is the question not an MCVE?

– john
Mar 24 at 7:38





@RSahu In what way is the question not an MCVE?

– john
Mar 24 at 7:38













You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

– R Sahu
Mar 24 at 7:42






You can add the few missing pieces to make sure that the code can be compiled to produce the exact error you are seeing.

– R Sahu
Mar 24 at 7:42














You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

– πάντα ῥεῖ
Mar 24 at 7:45






You cannot call the constructor via an instance. st.Student(ML,MSV); should be changed to st = Student(ML,MSV); or simpler Student st(ML,MSV);

– πάντα ῥεῖ
Mar 24 at 7:45













1 Answer
1






active

oldest

votes


















2














You can't call a constructor explicitely.
You should have written:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.push_back(Student(ML,MSV));


Following Hemil's suggestion and if you are using C++ 11, you can avoid constructing a temporary, via direct passing of constructor's arguments like this:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.emplace_back(ML,MSV);


For a simple struct like yours, it should not make any difference anyway, so use whatever you prefer.






share|improve this answer

























  • The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

    – john
    Mar 24 at 7:36







  • 1





    The way Student is being constructed, emplace_back is the way to go I feel

    – Hemil
    Mar 24 at 8:26











  • yeah,my code was run,thank you so much for that

    – Kan
    Mar 25 at 4:39











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














You can't call a constructor explicitely.
You should have written:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.push_back(Student(ML,MSV));


Following Hemil's suggestion and if you are using C++ 11, you can avoid constructing a temporary, via direct passing of constructor's arguments like this:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.emplace_back(ML,MSV);


For a simple struct like yours, it should not make any difference anyway, so use whatever you prefer.






share|improve this answer

























  • The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

    – john
    Mar 24 at 7:36







  • 1





    The way Student is being constructed, emplace_back is the way to go I feel

    – Hemil
    Mar 24 at 8:26











  • yeah,my code was run,thank you so much for that

    – Kan
    Mar 25 at 4:39















2














You can't call a constructor explicitely.
You should have written:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.push_back(Student(ML,MSV));


Following Hemil's suggestion and if you are using C++ 11, you can avoid constructing a temporary, via direct passing of constructor's arguments like this:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.emplace_back(ML,MSV);


For a simple struct like yours, it should not make any difference anyway, so use whatever you prefer.






share|improve this answer

























  • The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

    – john
    Mar 24 at 7:36







  • 1





    The way Student is being constructed, emplace_back is the way to go I feel

    – Hemil
    Mar 24 at 8:26











  • yeah,my code was run,thank you so much for that

    – Kan
    Mar 25 at 4:39













2












2








2







You can't call a constructor explicitely.
You should have written:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.push_back(Student(ML,MSV));


Following Hemil's suggestion and if you are using C++ 11, you can avoid constructing a temporary, via direct passing of constructor's arguments like this:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.emplace_back(ML,MSV);


For a simple struct like yours, it should not make any difference anyway, so use whatever you prefer.






share|improve this answer















You can't call a constructor explicitely.
You should have written:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.push_back(Student(ML,MSV));


Following Hemil's suggestion and if you are using C++ 11, you can avoid constructing a temporary, via direct passing of constructor's arguments like this:



while(inf)
 string ML,MSV;
 inf>>ML>>MSV;
 ListOfStudent.emplace_back(ML,MSV);


For a simple struct like yours, it should not make any difference anyway, so use whatever you prefer.







share|improve this answer














share|improve this answer



share|improve this answer








edited Mar 24 at 10:07

























answered Mar 24 at 7:30









xryl669xryl669

1,7131329




1,7131329












  • The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

    – john
    Mar 24 at 7:36







  • 1





    The way Student is being constructed, emplace_back is the way to go I feel

    – Hemil
    Mar 24 at 8:26











  • yeah,my code was run,thank you so much for that

    – Kan
    Mar 25 at 4:39

















  • The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

    – john
    Mar 24 at 7:36







  • 1





    The way Student is being constructed, emplace_back is the way to go I feel

    – Hemil
    Mar 24 at 8:26











  • yeah,my code was run,thank you so much for that

    – Kan
    Mar 25 at 4:39
















The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

– john
Mar 24 at 7:36






The code is good but Student(ML,MSV) is an explicit constructor call isn't it?

– john
Mar 24 at 7:36





1




1





The way Student is being constructed, emplace_back is the way to go I feel

– Hemil
Mar 24 at 8:26





The way Student is being constructed, emplace_back is the way to go I feel

– Hemil
Mar 24 at 8:26













yeah,my code was run,thank you so much for that

– Kan
Mar 25 at 4:39





yeah,my code was run,thank you so much for that

– Kan
Mar 25 at 4:39



















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