Pointer to structure required on left side

[lyhour]

#include<conio.h>
#include<alloc.h>
#include<string.h>
struct node
    { int info;
     struct node *l;
     struct node *r;
   } *node;
typedef struct node *pt;
void freenode( pt p)
    { freenode(p);}
pt getnode()
    { pt p;
     p=(struct node*)malloc(sizeof(struct node));
     return(p);
   }
void ini (pt *proot)
    { proot=NULL;}
pt makenode(int item)
    { pt p=getnode();
     p->info=item;
     p->l=NULL;
     p->r=NULL;
     return (p);
   }
void makeleft (pt p,int item)
    { if(p==NULL)
           printf("node p is NULL");
     else
             { if(p->l==NULL)
             p->l=makenode(item);
           else
               printf("node p has left son node");
         }
   }
void makeright(pt p,int item)
    {  if(p==NULL)
           printf("node p is NULL");
     else
             { if(p->r==NULL)
             p->r=makenode(item);
           else
               printf("node p has right son node");
         }
     }
void insert(pt proot, int item)
    { pt p;
     if(proot==NULL)
         {    p=getnode();
          p->info=item;
         p->l=NULL;
         p->r=NULL;
         proot=p;
      }
     else
         { if(item==p->info)
          printf("it has already");
        else if (p->info>item)
            insert(p->l,item);
        else
            insert(p->r,item);
      }
   }
pt del(pt p)
    { pt px,f;
     if (p==NULL)
             return (NULL);
     else if (p->l==NULL&&p->r==NULL)
             px=NULL;
     else if(p->l==NULL)
             px=p->r;
     else if(p->r==NULL)
             px=p->l;
     else
         { f=p;
        px=p->r;
        while(p->l!=NULL)
        {    f=px;
                px=px->l;
        }
      }
     if(f!=p)
        { f->l=px->r;
             px->r;p->r;
          px->l;p->l;
        }
     else
             px->l=p->l;
     freenode(p);
     return(px);
   }
void display (pt *tree,int level)
    { int i;
     if(tree!=NULL)
         {    display(tree->r,level+1);
          printf("\n");
         for (i=0;i<level;i++)
             printf("  ");
         printf("%d",tree->item);
         display(tree->l,level+1);
      }
   }
 

[lyhour]

To everyone please help me for this code , Thank in advance

[techboy]

which line you getting error and what error you got ?

[weaknessforcats]

This code:

void display (pt *tree,int level)
     { int i;
     if(tree!=NULL)
          {    display(tree->r,level+1);
     etc...
 

shows tree at a pt*. pt itself is a node* so this is really a node** for tree. What you really need is just a node*.

Therefore, change your function argument from pt* to pt and the pointer to structure on left side will disappear.

There are other errors, but this will get you started.