How do I convert C++ to C program? Please help

#include<bits/stdc++.h>
#include<iostream>
using namespace std;
struct linkedlist
{
    int info;
    struct linkedlist *next;
};
typedef struct linkedlist node;
void createlist(node *ptr)
{
 cout<<"Enter value (-1) to exit : ";
 cin>>ptr->info;
 if(ptr->info==-1)
 {
     ptr->next=0;
 }
 else
 {
     node *newnode;
     newnode=(node*)malloc(sizeof(node));
     ptr->next=newnode;
     createlist(newnode);
 }
}
void printlist(node *ptr)
{
    while(ptr->next!=0)
    {
        cout<<ptr->info<<" ";
        ptr=ptr->next;
    }
}
void insertbeg(node *ptr)
{
    node *newnode;
    newnode=(node*)malloc(sizeof(node));
    cout<<endl;
    cout<<"Enter insert value = ";
    cin>>newnode->info;
    newnode->next=ptr;
    ptr=newnode;
    cout<<endl;
    cout<<"inserted list = ";
    printlist(ptr);

}
int main()
{
    node *start;
    start=(node*)malloc(sizeof(node));
    createlist(start);
    printlist(start);
    insertbeg(start);
}

#include<bits/stdc++.h>
#include<iostream>
using namespace std;
struct linkedlist
{
    int info;
    struct linkedlist *next;
};
typedef struct linkedlist node;
void createlist(node *ptr)
{
 cout<<"Enter value (-1) to exit : ";
 cin>>ptr->info;
 if(ptr->info==-1)
 {
     ptr->next=0;
 }
 else
 {
     node *newnode;
     newnode=(node*)malloc(sizeof(node));
     ptr->next=newnode;
     createlist(newnode);
 }
}
void printlist(node *ptr)
{
    while(ptr->next!=0)
    {
        cout<<ptr->info<<" ";
        ptr=ptr->next;
    }
}
void insertbeg(node *ptr)
{
    node *newnode;
    newnode=(node*)malloc(sizeof(node));
    cout<<endl;
    cout<<"Enter insert value = ";
    cin>>newnode->info;
    newnode->next=ptr;
    ptr=newnode;
    cout<<endl;
    cout<<"inserted list = ";
    printlist(ptr);

}
int main()
{
    node *start;
    start=(node*)malloc(sizeof(node));
    createlist(start);
    printlist(start);
    insertbeg(start);
}