int main(void)

{
    double C=0.00000001, R1=500, R2=2000, Vin_pp=30;
    int F=500;
    double Zt, Vout;
    explain_program();
    Zt = calculate_Zt(C,R1,R2,F);
    double v;
    calculate_Vo(&v,C,R1,R2,F,&Vin_pp);
    printf("vo is %d",v);
    getchar();
    return 0;
}

static inline void calculate_Vo(double * v, double c1, double r1, double r2, int f, double *vpp)
{
    * v = * vpp * sqrt((pow((2*PI*f*c1*r2),2) + 1))/sqrt((pow((2*PI*f*c1*(r1+r2)),2) + 1));
}