Question

I am doing a sample application where I have declared a struct:

 // common.h
 typedef struct MyStruct
 {
   int a;
 }

  //sample.h
  #include "common.h"
  int main()
  {
     MyStruct st;// getting error here
  }

C2146: syntax error : missing ‘;’ before identifier

What are the possible reasons for this?

Answer 1

Two things:

First, you’re missing a semi-colon after the struct definition:

 // common.h
 typedef struct MyStruct
 {
     int a;
 };
  ^

Not that this is still wrong. You will need to fix the other error.

Second, you should define the struct like this:

 // common.h
 typedef struct
 {
     int a;
 } MyStruct;

Alternatively, you can define it like this:

 // common.h
 struct MyStruct
 {
     int a;
 };