Thread: help in writing a C-Progrm

Well i dont hnow what exactly you want to calc. I coded a bit, but i am not responsible for what the resulst are or what you really want to do with it. Look at the code and tell me what you dont understand.

Code:

//---------------------------------------------------------------------------

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

#define PI 3.14159265

#pragma hdrstop

//---------------------------------------------------------------------------
//Functions Prototypes.
double mFunction(double b, double gamma)
{
	return b * cos(gamma * PI / 180);
}
double nFunction(double c, double beta)
{
	return c * cos(beta * PI / 180);
}
double gFunction(double b, double gamma)
{
	return b * sin(gamma * PI / 180);
}
double SquareRootT(double c, double n, double h)
{
	double R = pow(c,2) - pow(n,2) - pow(h,2);
	if(R < 0)
		R = -R;
	return sqrt(R);
}
double hFunction(double c, double alfa, double beta, double gamma)
{
	return (c/ sin(gamma * PI / 180)) * (cos(alfa * PI /180)) - (cos(beta * PI / 180) * cos(gamma * PI / 180));
}

void CreateNewFile(char *oldFile, char *nFile,double a, double b, double c, double alfa, double beta, double gamma)
{
	if(!oldFile || !nFile)
	{
		printf("Error, NULL parametres.\n");
		return;
	}
	else
	{
		FILE *of = fopen(oldFile, "r");
		FILE *nf = fopen(nFile, "w");
		//Variables.
		double Col1 = 0.0;
		double Col2 = 0.0;
		double Col3 = 0.0;
		//Array to hold the numbers.
		double arr[3] = {0.0,0.0,0.0};
		if(!of)
		{
			fprintf(stderr, "Error can not open '&#37;s' file.\n", oldFile);
			return;
		}
		if(!nf)
		{
			fprintf(stderr, "Error can not open '%s' file.\n", nFile);
			return;
		}
		while(fscanf(of,"%lf\t%lf\t%lf\n", &arr[0], &arr[1], &arr[2]) != EOF)
		{
			//Weird numbers.
			Col1 = a * arr[0] + arr[1] * mFunction(b, gamma) + arr[2] * nFunction(c, beta);
			Col2 = arr[1] * gFunction(b, gamma) + arr[2] * hFunction(c, alfa, beta, gamma);
			Col3 = arr[2] * SquareRootT(c, nFunction(c, beta), hFunction(c, alfa, beta, gamma));

			//Got the numbers write them down to file.
			fprintf(nf,"%lf\t%lf\t%lf\n", Col1,Col2,Col3);
			//Zero the values for next iteration.
			arr[0] = 0.0;
			arr[1] = 0.0;
			arr[2] = 0.0;
		}
		fclose(nf);
		fclose(of);
	}

}

//---------------------------------------------------------------------------

#pragma argsused
int main(int argc, char* argv[])
{
	CreateNewFile("numbers.txt", "result.txt", 1.234, 3.456, 3.4534, 2.56, 4.78, 8.98);
	printf("Hit any key to continue......");
	getch();
	return 0;
}
//---------------------------------------------------------------------------

If you run the program it will create a new file in the debug folder that will hold the results. Have a look at them and tell me,
Bokarinho!!!
/Edit: Dont forget that the numbers.txt is the input file.