CODEWITHSUNDEEP
c++structure
BECOOL
BECOOL

Reputation: 203

How to access array of structure in another file

How to access array of structure in another file.lets say i have 3 file 1.h 2.cpp 3.cpp as below

1.h

    #include<stdio.h>
    struct st
  {
       Int i;
        char ch[10];

    };
   struct st var[10];

2.cpp

   #include"1.h"
     int main
     {
        int s;
       //here i hve scannd value of i frm user
       callotherfile();
      }

i 3.cpp

    #include"1.h
     int p;
       void callotherfile(void)
      { 
        for(p=1;p<=10;p++)
       cout<<var.i[p]<<end;// is it good can i excess?
      }

here i am getting errir as p and s are non of class type please help me to fix it

i am compiling as g++ 2.cpp 3.cpp

Upvotes: 0

Views: 2405

Answers (2)

R Sahu
R Sahu

Reputation: 206717

I suggest the following changes:

  1. Changes to 1.hpp.

    1. Remove #include <stdio.h>. you don't need it.

    2. Provide a declaration for the array, not a definition.

       struct st
 {
    int i; // You had Int, not int. I assume that was a typo.
    char ch[10];
 };
 extern struct st var[10];

  2. Changes to 2.cpp. Provide a declaration for callotherfile before you use it.

    #include "1.h"
void callotherfile(void);
int main()
{
   int s;  // This is an unused variable. It can be removed.
   callotherfile(); // You had a : not a ;. I assume that was a typo
}

  3. Changes to 3.cpp.

    1. Add #include <iostream>. You need it to use std::cout and std::endl.
    2. Provide a definition of the array.
    3. Use cout and endl with the std:: scope.
    4. Since var is an array, use var[p].i instead of var.i.

    5. Stop the loop when the loop counter reaches p, not when it exceeds p. Please note that 10 is not a valid index for an array with 10 elements.

      #include <iostream>

#include "1.h"
struct st var[10];
int p;  // This variable can be moved to the function scope.
void callotherfile(void)
{ 
   for(p=1;p<10;p++) // You had p<=10
      std::cout<<var[p].i<<std::endl;
}

Upvotes: 1

smali
smali

Reputation: 4805

Changes you need to do

1 #include "1.h" in 3.cpp this might be a typo but this will also not solve ur problem just to note

2 You need to include 3.cpp in the file '2.cpp'

3 compile it using this command 'g++ 2.cpp'

4 callotherfile(): put semicolon ; here

5 cout<<var.i<<end put semicolon ; at the end

Upvotes: 0

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