Question

Sorry for messing you all with the C stuff.
The write() takes void * buff. And i need to call this function from main() by giving the required data.

But when i am printing it throws an error. Help me out friends.
Code is as follows.

void write(int fd, void *buff,int no_of_pages)
{
  // some code that writes buff into a file using system calls
}

Now i need to send the buff with the data i need.

#include "stdio.h"
#include "malloc.h"
int main()
{
int *x=(int*)malloc(1024);
*(x+2)=3192;

*(x+3)="sindhu";

     printf("\n%d %s",*(x+2),*(x+3));      

     write(2,x,10); //(10=4bytes for int + 6 bytes for char "sindhu");
}

It warns me

warning: format ‘%s’ expects type ‘char *’, but argument 3 has type ‘int’

How can i remove this warning

Answer 1

By casting to a valid type:

printf("\n%d %s",*(x+2),(char*)(x+3)); 

Note: What you’re doing looks evil. I’d reconsider this design!