A mathematical model of C# language, apply to create a MT4 indicator !!

/*--------------------------------------------------------------*

To modify generated output
*--------------------------------------------------------------*/

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

double eqn6850(double x);

void main(void)
{
double x,y;
char str[80];
while(1){
printf("Enter x: ");
gets(str);
if(!*str) break;
sscanf(str,"%lg",&x);
y=eqn6850(x);
printf(" y=%.15lg\n",y);
}
}


/*--------------------------------------------------------------*/
double evalfpoly(int order, double x, double *c)
/*--------------------------------------------------------------*/
{
int i,j;
double y=c[0];
x=(x-(1.000000000000000))/(1027.186002715093);
for(i=1,j=1;j<=order;j+=2,i++)
y += c[j]*cos(i*x)+c[j+1]*sin(i*x);
return y;
}

/*--------------------------------------------------------------*/
double eqn6850(double x)
/*--------------------------------------------------------------*

a= -1988.532414673345
b= -3116.002162637732
c= 3644.662403802266
d= 2784.33539011638
e= 5149.024722269687
f= 5589.036234895881
g= -1740.995541288461
h= -852.5205018672013
i= -4685.18583825292
j= -3157.372613975506
k= 291.0488944901461
l= 38.19166147677898
m= 1716.365402621813
n= 738.0280483169678
o= 26.91111687090461
p= 21.09628861488089
q= -239.3793336551126
r= -52.8543381119665
s= -7.07871238136268
t= -1.0580188789772
u= 6.013791704694437
*--------------------------------------------------------------*/
{
double y;
static double c[]= {
-1988.532414673345,
-3116.002162637732,
3644.662403802266,
2784.335390116380,
5149.024722269687,
5589.036234895881,
-1740.995541288461,
-852.5205018672013,
-4685.185838252920,
-3157.372613975506,
291.0488944901461,
38.19166147677898,
1716.365402621813,
738.0280483169678,
26.91111687090461,
21.09628861488089,
-239.3793336551126,
-52.85433811196650,
-7.078712381362680,
-1.058018878977200,
6.013791704694437,
};
y=evalfpoly(20,x,c);
return;
}