Binary tree

#include<stdio.h>
#include<stdlib.h>

int count=0,max=0,min=0,len=0;
int pre[100],post[100],in[100],ic=0,pc=0,poc=0;
typedef struct node
{
    int info;
    struct node *lc,*rc;
}bst;

void create(bst *root)
{
    len++;
    char ans;
    bst *ptr;
    printf("\nDo you want to create the left child of %d? ",root->info);
    fflush(stdin);
    scanf("%c",&ans);
    if(ans=='Y' || ans=='y')
    {
        ptr=(bst*)malloc(sizeof(bst));
        printf("\nenter the information for the left child: ");
        scanf("%d",&ptr->info);
        ptr->lc=ptr->rc=NULL;
        root->lc=ptr;
        create(root->lc);
    }
    else
        root->lc=NULL;
    printf("\nDo you want to create the right child of %d? ",root->info);
    fflush(stdin);
    scanf("%c",&ans);
    if(ans=='Y' || ans=='y')
    {
        ptr=(bst*)malloc(sizeof(bst));
        printf("\nenter the information for the right child: ");
        scanf("%d",&ptr->info);
        ptr->lc=ptr->rc=NULL;
        root->rc=ptr;
        create(root->rc);
    }
    else
        root->rc=NULL;
}

void preorder(bst *root)
{
    if(root==NULL)
        return;
    printf("%d ",root->info);
    preorder(root->lc);
    preorder(root->rc);
}

void inorder(bst *root)
{
    if(root==NULL)
        return;
    inorder(root->lc);
    printf("%d ",root->info);
    inorder(root->rc);
}

void postorder(bst *root)
{
    if(root==NULL)
        return;
    postorder(root->lc);
    postorder(root->rc);
    printf("%d ",root->info);
}

void cntleaf(bst *root)
{

    if(root==NULL)
        return;
    if(root->lc==NULL && root->rc==NULL)
    {
        count++;
        printf("leaf=%d\n",root->info);
    }

    cntleaf(root->lc);
    cntleaf(root->rc);

}
void Search(bst *root,int n)
{

    if(root==NULL)
        return;
    if(root->info==n)
    {
        count=1;
        return;
    }
    Search(root->lc,n);
    Search(root->rc,n);
}

void min_max(bst *root)
{

    if(root==NULL)
        return;
    if(root->info>=max)
    {
        max=root->info;
    }
    if(root->info<=min)
    {
        min=root->info;
    }
    min_max(root->lc);
    min_max(root->rc);
}

void inSuc(bst *root)
{
    if(root==NULL)
        return;
    inSuc(root->lc);
    //printf("%d ",root->info);
    in[ic++]=root->info;
    inSuc(root->rc);
}

void posSuc(bst *root)
{
    if(root==NULL)
        return;
    posSuc(root->lc);
    posSuc(root->rc);
    //printf("%d ",root->info);
    post[poc++]=root->info;
}

void preSuc(bst *root)
{
    if(root==NULL)
        return;
    //printf("%d ",root->info);
    pre[pc++]=root->info;
    preSuc(root->lc);
    preSuc(root->rc);
}


int main()
{
    bst *root=NULL,*ptr;
    int ch,n,i,j=0,len=0;
    printf("\nenter the information for the root: ");
    ptr=(bst*)malloc(sizeof(bst));
    scanf("%d",&ptr->info);
    ptr->lc=ptr->rc=NULL;
    root=ptr;
    create(root);
    while(1)
    {
        printf("\n**MENU**");
        printf("\n1. Preorder\n2. Inorder\n3. Postorder\n4. no of leafs \n5. search\n6. max min\n7. inorder Successor \n8. postorder Successor \n9. preorder successor \n10. exit");
        printf("\nenter your choice: ");
        scanf("%d",&ch);
        switch(ch)
        {
            case 1: preorder(root);
                    break;
            case 2: inorder(root);
                    break;
            case 3: postorder(root);
                    break;
            case 4:
                    cntleaf(root);
                    printf("no of leafs =%d",count);
                    break;
            case 5:
                printf("\nenter element to be searched: ");
                scanf("%d",&n);
                Search(root,n);
                if(count==1){
                    printf("found");
                }
                else
                {
                    printf("not found");
                }
                count=0;
                break;
            case 6:
                max=root->info;
                min=root->info;
                min_max(root);
                printf("max =%d  min =%d",max,min);
                break;
            case 7:
                printf("enter the value :");
                scanf("%d",&n);
                 inSuc(root);
                 j=0;
                 len=ic;
                 //printf("%d",len);
                 for(i=0;i<len;i++)
                 {

                    if(in[i]==n)
                    {
                        j=1;
                        break;
                    }
                 }
                 if(j==1)
                 {
                    printf("%d",i);
                    if(i==len-1)
                        printf("no Successor");
                    else
                        printf("the successor of %d is %d",n,in[i+1]);
                 }
                 else
                    printf("no successor");
                 break;
            case 8:
                printf("enter the value :");
                scanf("%d",&n);
                 posSuc(root);
                 j=0;
                 len=poc;
                 for(i=0;i<len;i++)
                 {
                    if(post[i]==n)
                    {
                        j=1;
                         break;
                    }
                 }
                 if(j==1){
                    if(i==len-1)
                    printf("no Successor");
                    else
                    printf("the successor of %d is %d",n,post[i+1]);
                 }
                 else
                 printf("no node");
                 break;
            case 9:
                printf("enter the value :");
                scanf("%d",&n);
                 preSuc(root);
                 j=0;
                 len=pc;
                 for(i=0;i<len;i++)
                 {
                    if(pre[i]==n)
                    {
                        j=1;
                         break;
                    }
                 }
                 if(j==1){
                    if(i==len-1)
                    printf("no Successor");
                    else
                    printf("the successor of %d is %d",n,pre[i+1]);
                 }
                 else
                 printf("no node");
                 break;
            case 10:exit(0);
        }
    }
}