C++ Programming - Functions - Discussion

#include<iostream.h>
double BixFunction(double, double, double = 0, double = 0, double = 0);
int main()
{
    double d = 2.3;
    cout<< BixFunction(d, 7) << " ";
    cout<< BixFunction(d, 7, 6) << endl;
    return 0; 
}
double BixFunction(double x, double p, double q, double r, double s)
{
    return p +(q +(r + s * x)* x) * x;
}

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