Loops Practise(Average)

#include <iostream.h>
int main ()
{
    long int v=0;  //v for value
    float c=0;
    long int s=0;  //s for sum
    float avg;  //avg for average
    cout <<"Enter value \n";
    cin >> v;
    while (v!=0) //loop until "v"=o
    {
        c=c++;
        s=s+v;
        cout <<"\n\nEnter another value (0 to get average)) = ";
        cin >> v;
    }
    avg=s/c;
    cout <<"\naverage is = " << avg;
    return 0;

}