writing a formula in c++

[Guest_imported]

Does anyone know how to write an algebra formula in c++. The formula is K=H(i/(1-(1+i)^-t). I been trying for hours and no luck yet it.

Thanx

 

[2ffat]

I'm assuming that H and K are floating point and i and t are integers.

double K, H;
int i, t;
// Somewhere you need to get i, k, and H.
// I'll assume that you've done that here
.
.
.
double Holdi = (double)i; // Put i to a float
// I'm breaking this out into parts starting with inner ()
i++; // (1+i)

// This loop creates i^t
for (int x = 0; x < t; x++)
   i*=i; // i=i*i;

double HoldExp = (double)1/i; // My math is fuzzy here. i^-t
double HoldMinus = 1-HoldExp; // 1 - (1+i)^-t)
Holdi /= HoldMinus; // i/(1-(1+i)^-t)

K = H / Holdi; // Solution

I'm the first to admit that my math is a bit fuzzy. I deal with data bases more than algebra. Also, I'm doing this from memory so what out for both math and coding errors but hopefully you get the idea.

Also, you can clean up this code and combine much of it. I seperated out so you can see how it should be done. James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.

 

[Guest_imported]

Thank you! 2ffat for your help.

 

[dcelso]

all the variables must be doubles:
k=H(i/(1-pow(1+i,-t)). Do you must included the math library. <math.h>