Calling init function through main in C

**laserlight** · 11-23-2015

You made a typo error: typdef should be typedef.

Note that you forgot to change one more appearance of bool_t to int.

Finally, you need to pass a pointer to the Dip object in main, and then you probably want to store the return value of the function to print it or something.

**amahmoo** · 11-23-2015

i am confused with some of these erros

**laserlight** · 11-23-2015

Fix what I suggested first.

**amahmoo** · 11-23-2015

Finally, you need to pass a pointer to the Dip object in main, and then you probably want to store the return value of the function to print it or something.
how do i do this

**amahmoo** · 11-23-2015

Code:

#include <stdio.h>
#include <stdbool.h>

typedef struct dip_gat
{
int inst;
}Dip;
 
int func( Dip* req )
{
    int response = 1;
  
    
    if ( req->inst == 0 )
    {
      response = 0;
    }
    else
    {
        Response = 1;
    }
  
    return ( response);
}
 


int main()
{
   
    Dip req;
    req.inst = 1;
    func();
    return 0;
}

**laserlight** · 11-23-2015

Originally Posted by amahmoo

Finally, you need to pass a pointer to the Dip object in main, and then you probably want to store the return value of the function to print it or something.
how do i do this

Recall that &req will result in a pointer to the Dip object named req.

**amahmoo** · 11-23-2015

you need to pass a pointer to the Dip object in main, <<<<<<<<how do i pass pointer to Dip pbject in main
and then you probably want to store the return value of the function to print it or something.

**laserlight** · 11-23-2015

Refer to my post #8.

**amahmoo** · 11-23-2015

Dip *treq =&req<< what does this do

Code:

#include <stdio.h>
#include <stdbool.h>


typedef struct dip_gat
{
int inst;
}Dip;
 
int func( Dip* req )
{
    int Response ;
  
    
    if ( req->inst == 0 )
    {
      Response = 0;
    }
    else
    {
        Response = 1;
    }
  
    return ( Response);
}
 


int main()
{
   
    struct Dip req;
    func(&req,1);
    print("%d\n",req.inst);
    return 0;
}

**amahmoo** · 11-23-2015

prog.c: In function 'main':
prog.c:30:16: error: storage size of 'req' isn't known
struct Dip req;
^
prog.c:31:5: error: too many arguments to function 'func'
func(&req,1);
^
prog.c:9:5: note: declared here
int func( Dip* req )
^
prog.c:32:5: warning: implicit declaration of function 'print' [-Wimplicit-function-declaration]
print("%d\n",req.inst);
^
prog.c:30:16: warning: unused variable 'req' [-Wunused-variable]
struct Dip req;
^

**laserlight** · 11-23-2015

Read the error messages: too many arguments to function 'func'

**amahmoo** · 11-23-2015

Code:

#include <stdio.h>
#include <stdbool.h>


typedef struct dip_gat
{
int inst;
}Dip;
 
int func( Dip* req )
{
    int Response ;
  
    
    if ( req->inst == 0 )
    {
      Response = 0;
    }
    else
    {
        Response = 1;
    }
  
    return ( Response);
}
 


int main()
{
   
    struct Dip req;
    req.inst =1;
    func(req);
    printf("%d\n",req.inst);
    return 0;
}

**amahmoo** · 11-23-2015

prog.c: In function 'main':
prog.c:30:16: error: storage size of 'req' isn't known
struct Dip req;
^
prog.c:30:16: warning: unused variable 'req' [-Wunused-variable]

**laserlight** · 11-23-2015

I give up:

Code:

#include <stdio.h>

typedef struct
{
    int inst;
} Dip;

int func(Dip *req)
{
    int response;

    if (req->inst == 0)
    {
        response = 0;
    }
    else
    {
        response = 1;
    }

    return response;
}

int main(void)
{
    int result;
    Dip req;

    req.inst = 1;
    result = func(&req);
    printf("inst=%d; result=%d\n", req.inst, result);

    req.inst = 0;
    result = func(&req);
    printf("inst=%d; result=%d\n", req.inst, result);

    return 0;
}

If you are smart, you will do your best to actually understand this, comparing it to your own attempts, instead of just getting spoonfed.

**amahmoo** · 11-23-2015

Originally Posted by laserlight

I give up:

Code:

#include <stdio.h>

typedef struct
{
    int inst;
} Dip;

int func(Dip *req)
{
    int response;

    if (req->inst == 0)
    {
        response = 0;
    }
    else
    {
        response = 1;
    }

    return response;
}

int main(void)
{
    int result;
    Dip req;

    req.inst = 1;
    result = func(&req);
    printf("inst=%d; result=%d\n", req.inst, result);

    req.inst = 0;
    result = func(&req);
    printf("inst=%d; result=%d\n", req.inst, result);

    return 0;
}

If you are smart, you will do your best to actually understand this, comparing it to your own attempts, instead of just getting spoonfed.

thank you you taught me alot i understand everything from here