C++ Can't use string in structs?

[Guest]

I decided for practice and studying purposes to create a quiz game that helps me learn how many bytes each data type is (e.g. the answer for char would be 1 byte)

My initial plan was this:

#include <iostream>using namespace std;struct quiz_question {    string var_type;    string input_answer;    string real_answer;};int main() {    quiz_question question_one = {        "char",        "",        "",    };}

The idea was to create a structure that I can use for each quiz question. The input_answer will be filled in by cin later, and real_answer will be determined by the sizeof function. If you guess correctly you get a point, if you guess incorrectly you lose a life. However, I  have this issue:

 

What did I do wrong?

Also, it's okay to have the struct there right?

[Nineshadow]

You don't have a constructor for the struct for it to work like that. Also, don't forget to include std::string.

You can, however, do something like this :

struct quiz_question{string var_type;string input_answer;string real_answerquiz_question(string str1 , string str2, string str3) { var_type = str1, input_answer = str2 , real_answer = str3;}};

Or with initialization lists :

struct quiz_question{string var_type;string input_answer;string real_answer;quiz_question(string str1 , string str2, string str3) : var_type(str1) , input_answer(str2) , real_answer(str3){}};

And use it like this:

quiz_question q("hello", "there" , "world");

Or just set those values :

quiz_question q;/* ... */q.var_type="char";

[Guest]

 

You don't have a constructor for the struct for it to work like that. Also, don't forget to include std::string.

You can, however, do something like this :

struct quiz_question{string var_type;string input_answer;string real_answerquiz_question(string str1 , string str2, string str3) { var_type = str1, input_answer = str2 , real_answer = str3;}};

And use it like this:

quiz_question q("hello", "there" , "world");

Or just set those values :

quiz_question q;/* ... */q.var_type="char";

Thanks! I have little idea how constructors and destructors work as it is now. I'll have to research them.

[Nineshadow]

Thanks! I have little idea how constructors and destructors work as it is now. I'll have to research them.

I also added a constructor example with an initialization list.

[fizzlesticks]

Since your quiz_question is just a bunch of data you could make it a struct instead of a class in which case the code you used would work correctly.

[Guest]

Since your quiz_question is just a bunch of data you could make it a struct instead of a class in which case the code you used would work correctly.

I messed up, I actually just switched it to class to see if it would magically work somehow and forgot about it, it was struct

[fizzlesticks]

I messed up, I actually just switched it to class to see if it would magically work somehow and forgot about it, it was struct

What compiler / standard are you using? 

[Guest]

What compiler / standard are you using? 

c++14, gcc

[fizzlesticks]

c++14, gcc

It may be a bug in the compiler or something. I tried in g++ and VS and your original code with a struct works fine.