insertion sort in c++

Insertion sort 

#include<iostream.h>                                                         

#include<limits.h>                                                            

void InsSort(int[], int);     
                                               

void main()                                                                  

{                                                                            

    int ar[50], item, n, index;                                                

    cout<<"how many elements do u want to create array with?";                 

    cin>>n;                                                                    

    cout<<"\nenter array elements...";                                         

    for(int i=1; i<=n; i++)                                                    

    cin>>ar[i];                                                               

    InsSort(ar, n);                                                             

    cout<< "\n\ the sorted array is as shown below...\n";                     

    for(i=1; i<=n ;i++)                                                        

        cout<<ar[i]<<" ";                                                          

    cout<<endl;                                                                

}          
                                                                  

  void InsSort (int ar[], int size)                                            

 {  

        int tmp,j;                                                               

        ar[0] = int_min;                                                         

        for(int i=1; i<=size; i++)

    {                                                                            

         tmp=ar[i];                                                                   

         j=i-1;                                                                      

        while(tmp<ar[j])                                                             

       {  ar[j+1]=ar[j];                                                               

            j--;                                                                   

       }                                                                            

       ar[j+1]=tmp;                                                                  

       cout<<"array after pass -" << i <<" - is : ";                                

       for(int k=1; k<=size; k++)                                                    

       cout<<ar[k]<<" ";                                                            

       cout<<endl;                                                                

    }                                                                         

}