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Array of Structure

Posted on 2001-06-25
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Last Modified: 2010-08-05
Hello,

Does anyone know how to create array of struct
and pass into a function and how to access it
in the functin ?
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Comment
Question by:g_temp
6 Comments
 
LVL 5

Expert Comment

by:djbusychild
ID: 6226243
#include <stdio.h>

typedef struct mystruct {
     int i;
} mystruct_st;


void func(mystruct_st* user_struct, int len)
{
     int i;
     for (i = 0;i<len;i++) {
          printf("struct %d = %d\n",i,user_struct[i].i);
     }
}

int main(int argc, char* argv[])
{
     int i;
     mystruct_st struct_arr[5];
     
     for (i = 0;i<5;i++) {
          struct_arr[i].i = i;
     }

     func(struct_arr,5);

     return 0;
}
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Author Comment

by:g_temp
ID: 6272099
What if i want a dynamic char instead of int ?
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Expert Comment

by:djbusychild
ID: 6273384
same thing

just use char* instead of int
and malloc character array

#include <stdio.h>

typedef struct mystruct {
    char* i;
} mystruct_st;


void func(mystruct_st* user_struct, int len)
{
    int i;
    for (i = 0;i<len;i++) {
         printf("struct %d = %d\n",i,user_struct[i].i);
    }
}

int main(int argc, char* argv[])
{
    int i;
    mystruct_st struct_arr[5];
   
    for (i = 0;i<5;i++) {
         struct_arr[i].i = (*char)malloc(256);
    }

    func(struct_arr,5);

    return 0;
}
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Accepted Solution

by:
djbusychild earned 100 total points
ID: 6274006
oops... I didn't put anything into the buffer. =)

right now the program will most probably crash depending on what garbage is in the buffer.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

typedef struct mystruct {
   char* i;
} mystruct_st;


void func(mystruct_st* user_struct, int len)
{
   int i;
   for (i = 0;i<len;i++) {
        printf("struct %d = %s\n",i,user_struct[i].i);
   }
}


int main(int argc, char* argv[])
{
   int i;
   mystruct_st struct_arr[5];
   
   for (i = 0;i<5;i++) {
        struct_arr[i].i = (char*)malloc(256);
        strcpy(struct_arr[i].i,"hello world");
   }

   func(struct_arr,5);

   return 0;
}
0
 
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Expert Comment

by:griessh
ID: 6820057
I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. Unless there is objection or further activity,  I will suggest to accept "djbusychild" comment(s) as an answer.

If you think your question was not answered at all, you can post a request in Community support (please include this link) to refund your points.
The link to the Community Support area is: http://www.experts-exchange.com/jsp/qList.jsp?ta=commspt

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner

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Expert Comment

by:ComTech
ID: 6837755
Accepted question as recommended.

Regards,
ComTech
CS @ EE
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