Array copying problem

Hi I am trying to copy one struct to another, but I am making some minor mistake that it is not getting copied. Can someone help me fix it?

Code:

#include<stdio.h>
#include<stdlib.h>
typedef struct
{
    int inst_addr;
}instruction;

void copy_struct(instruction src,instruction dest)
{
    dest.inst_addr = src.inst_addr;
}

int main()
{
    int addr = 1000;
    instruction check1;
    instruction check2;
    check1.inst_addr = 10;
    check2.inst_addr = 50;   
    copy_struct(check1,check2);
    printf("%d",check2.inst_addr);
}        

 

You need to send two pointers to the function that will copy the structure.

Code:

void copy_struct(instruction *src, instruction *dest)
{
 *dest=*src;
}

see the Link
http://cboard.cprogramming.com/c-programming/124395-copying-function-problem.html

 

You can not straight away copy the structure ,you need to pass the address of the structure to the function then using that address you can copy the contents.

 

@ungalnanban

Thanks for ur reply..
But when i call the function in main, I get this error.

 

This is the error message:


error: incompatible type for argument 1 of ‘copy_struct’
note: expected ‘struct instruction *’ but argument is of type ‘instruction’
error: incompatible type for argument 2 of ‘copy_struct’
note: expected ‘struct instruction *’ but argument is of type ‘instruction’

Am I making some mistake in calling the fuction?

 

Code:

typedef struct
{
    int inst_addr;
}instruction;

void copy_struct(instruction *src,instruction *dest)
{
   dest->inst_addr = src->inst_addr;
}

int main()
{
    int addr = 1000;
    instruction check1;
    instruction check2;
    check1.inst_addr = 10;
    check2.inst_addr = 50;
    copy_struct(&check1,&check2);
printf("%d",check2.inst_addr);
}

 

The above code is similar to arun10427 code , but I changed the function call as a
call by reference.

 

want to copy the whole struct
try this
*dest =*src ;

 

See the following Example:

Code:

#include<stdio.h>

typedef struct
{
        int inst_addr;
}instruction;

void copy_struct(instruction *src,instruction *dest)
{
        *src=*dest;
}


int main()
{
        int addr = 1000;
        instruction check1;
        instruction check2;

        check1.inst_addr = 10;
        check2.inst_addr = 50;
        printf("One: %d\n",check1.inst_addr);
        printf("Two: %d\n",check2.inst_addr);
        copy_struct(&check1,&check2);
        printf("One: %d\n",check1.inst_addr);
        printf("Two: %d\n",check2.inst_addr);
}

Output:
One: 10
Two: 50
One: 50
Two: 50