Question

I am getting errors for the below program.

#include "stdafx.h"
#include<stdio.h>

struct s 
{
  char *st;
  struct s *sp; 
};

struct s *p1,*p2;
swap(p1,p2);

int main()
{
    int i;
    struct s *p[3];
    static struct s a[]={
        {"abc",a+1},{"def",a+2},{"ghi",a}
    };
    for(i=0;i<3;i++)
    {
     p[i]=a[i].sp;
    }
    swap(*p,a);
    printf("%s %s %s\n",p[0]->st,(*p)->st,(*p)->sp->st);
    return 0;
}

swap(p1,p2)
{
    char *temp;
    temp = p1->st;
    p1->st = p2->st;
    p2->st = temp;
}

How to make this program working.Even if we didnt put int before swap I hope it will by default take it as int .

error C4430: missing type specifier – int assumed. Note: C++ does not
support default-int

error C2078: too many initializers

error C2440: ‘initializing’ : cannot convert from ‘s *’ to ‘int’
There is no context in which this conversion is possible

error C2450: term does not evaluate to a function taking 2 arguments

error C2456:’swap’ : function-style

Answer 1

Try

void swap(struct s *p1, struct s *p2);

void swap(struct s *p1, struct s *p2)
{
    char *temp;
    temp = p1->st;
    p1->st = p2->st;
    p2->st = temp;
}