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i solved the problem,
thank you.

o.k
but instead of getch(), tell me what to use?

well, i'm working with Borland C++, it is not necessary to write ".h" at the end.
About the others libraries, i do not use for the moment.
I just took part of a program and posted it.

Hello everybody,
see this program


#include<stdlib>
#include<stdio>
#include<conio>
#include<iostream>

using namespace std;

Thank you all(Daved,et al.)
I solved the problems,
The problem was with the function.

Gracias!!!!

i am tryng.

I dont know how to solve this problem, the problem remains!!!!

i mean I took

You are right,
i ook this part of program and execute it and works! That is the error is not about casting..
thii is the program


#include<stdio>
#include<stdlib>
#include<iostream>...

well, the function is O:K, the error appears before the function works

no, i did not miss anything

I thought that the problem was the "CASTING", c is float, n is integer...

yeah, it has stable solution every interval -PI/2 + kPI,PI/2 + kPI, k belongs to integer set

here it goes the original


#include<stdio>
#include<stdlib>
#include<iostream>
#include<math>
#define PI 3.14159265358979324

using namespace std;

well, i forgot to put ";" in


float z= 1/2.0-x*tan(x)+x

but...

yeah!

O.K. Daved, this is the program


#include<stdio>
#include<stlib>
#include<iostream>
#include<math>
#define PI 3.14159265358979324

using namespace std;

Well , the error remains, this is the excact error:
"Project iterarmulti.exe raised exception class EInvalidOp with message 'Invalid floating point operation'. Process stopped . Use Step or Run to...

i'm going to probe,

P.S. I'm working with Borland C++ 4.0

yes, i removed #define and put const double Pi ... but remains the error

Thanks, but i made the change and the error remains "invalid floating overpoint"

Hello Everybody,

I ve got this error "Invalid floating point operation" whne i compile this:

...
#define Pi = 3.141596
...
float c;
int n;