Can anyone explain me the reason why this code does not work?

Question

#include <stdio.h>

int main ()
{
int str;
printf("Enter your message:\n");
scanf("%s",&str);
printf("message:\t",str);

return 0;
}

Answer 1

Got it. So is this right?
_____________________

#include <stdio.h>

int main ()
{
int str;
printf("Enter your message:\n");
scanf("%d",&str);
printf("message:%d\t",str);

return 0;
}

Answer 2

its
%s", str) not %d

Answer 3

For a string
___________

#include <stdio.h>

int main ()
{
string str;
printf("Enter your message :\n") ;
scanf("%s",&str) ;
printf("message:%s\t" str) ;

return 0;
}