how to run C++ program in Visual Studio 2010

#include<stdio.h>
#include<conio.h>
struct node
{
    int data;
    int count;
    struct node *right, *left;
}*root,*p,*q;

struct node *make(int y,int x)
{
    struct node *newnode;
    newnode=(struct node *)malloc(sizeof(struct node));
    newnode->data=y;
    newnode->count=x;
    newnode->right=newnode->left=NULL;
    return(newnode);
}

void left(struct node *r,int x)
{
    if(r->left!=NULL)
        printf("\n Invalid !");
    else
        r->left=make(x,y);
}

void right(struct node *r,int x)
{
    if(r->right!=NULL)
        printf("\n Invalid !");
    else
        r->right=make(x,y);
}


int postorder(struct node *r)
{
    int c=0;
    if(r!=NULL)
    {
        i=preorder(r->left);
        if(i!=0)
            ++c;
        i=preorder(r->right);
        if(i!=0)
            ++c;
        r->count=c1+c2;
        printf("\t %d \t %d",r->data,r->count);
    }
}


int i=0;
void main()
{
    int no1,no2;
    int choice;
    clrscr();
    printf("\n Enter the root:");
    scanf("%d",& no1);
    scanf("%d",& no2)
    root=make(no1,no2);
    p=root;
    while(1)
    {
        printf("\n Enter id and 0 number:");
        scanf("%d",& no1);
        scanf("%d",& no2);
        
        if(no1==-1)
            break;
        p=root;
        q=root;
        while(no1!=p->data && q!=NULL)
        {
            p=q;
            if(no1<p->data)
                q=p->left;
            else
                q=p->right;
        }
        if(no1<p->data)
        {
            printf("\n Left branch of %d is %d",p->data,no1);
            left(p,no1);
        }
        else
        {
            right(p,no1);
            printf("\n Right Branch of %d is %d",p->data,no1);
        }
    }
    while(1)
    {
        printf(" 3.Postorder Traversal \n 4.Exit");
        printf("\n Enter choice:");
        scanf("%d",&choice);
        switch(choice)
        {
            case 3 :postorder(root);
                break;
            case 4 :exit(0);
            default:printf("Error ! Invalid Choice ");
                break;
        }
        getch();
    }

}