C++ :: Polynomial Coefficients Are Memorialized In Field Of Real Double Precision Numbers
Mar 19, 2013
I am starting to learn C++.Designing class CPolynom to work with polynomials. The polynomial coefficients are memorialized in the field of real double precision numbers. Implement the following functions:
-Constructor, which defines the order of the polynomial CPolynom(int order)
-method to add the appropriate grade Coef(int exp, duble coef)
-method of addition, subtraction, multiplication and division two polynomials
-method to add a field coefficient
-method for nala
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Feb 25, 2014
I'm displaying a table of floating point numbers with setprecision(5). If the number is "1.25" it will display "1.2500" which is what I want. However, if the number is "0.25" it will display "0.25000"
How can I make numbers with a base number of zero display properly?
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Apr 12, 2015
So I have this class
class DataBase
{
// Change the connection path here to your own version of the database
public SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)v11.0;AttachDbFilename=|DataDirectory|UberDatabase.mdf;Integrated Security=True;");
public DataBase()
{
}
}
And in the same namespace as this class I have a form that calls it like so:
DataBase dBase = new DataBase();
SqlCommand trythis = new SqlCommand("Register", dBase.con);
However, I'm getting the field initializer error on dBase.con. I'm not sure why, but when I call the database from another file (program.cs) it works fine this way.
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May 14, 2013
I am working on a project where I need to retrive a double number and store 8 bits of the number in one field and the other 16 bits in another field. the code below gives me an error.
lata= lat>>8;
latb = (lat & 0xff);
The error states that & and >> are illegal for double. With this in mind, can I use these on a double. If not what can I do to achieve what I am trying to do?
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Apr 19, 2012
How to get double random numbers in the range from 0 to 1?
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Jan 29, 2014
So I have a double array, where I'm inputting float numbers to certain points in an array. Sometimes, the numbers that are printed out are completely different from what I put in.Here is the part of the code:
Code: .
while( token != NULL ) {
num = atof(token);
test[j][i] = num;
printf( "
%s, i is %d, j is %d
", token,i,j );
printf( "number is %f
value test of i,j is %f
[code]....
Why the float num prints out fine, but when put into an array becomes garbage?I'm taking string values from a csv file and turning them into floats, but no problems seem to crop up there.I reset i when appropriate and increment j when needed, so I don't think my problems are from incorrect array values (though they might be)
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Jul 25, 2013
Setting precision for the float value .. E.g..
ostrstream out;
float fvalue = 2.7889
out << fvalue;
if I take the value of out.str() i should be able to get 2.78 only.
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Sep 6, 2013
I was working on float and double data types and to see the results i wrote this program:
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;
int main() {
ofstream outputF("output.txt");
double a = 1;
double outcome;
[Code] ....
Well I understand the part it cannot store infinite numbers. but if you take a look at the output for example (since it is too long i just added some of the outputs)
//---------------------
for the value of : 001
1
//---------------------
for the value of : 002
0.5
//---------------------
for the value of : 003
0.3333333333333333148
[Code] ....
if you look carefully at the value "5" and "10" results. it is awkwardly abnormal. which is something i couldnt understand. also it is the same with value "20", "25", "40", "50" and so on.
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Mar 31, 2014
Can we change the floating point number format from scientific format to below example format ?
FROM TO
==========================
2.06374E-03 ---> 206370-8
-4.30311E-01 ---> -.430310
-4.28146E-04 ---> -42815-8
==========================
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Jul 16, 2014
I have this
Code:
#include <stdio.h>
int main() {
float number1, number2;
printf("Enter two numbers separated by a comma ");
scanf("%f,%f", &number1, &number2);
[Code] ....
When it prints the values, it prints them as I want. the problem is, what happens when someone puts in values with different width and precision? Here I had to write in the width and precision to display the values that are specified in the book. but what happens when someone puts in something that doesn't have those width/precision?
I end up with a lot of zeros after the number. initially I got 24.000000 (zeros are not accurate amount) I needed to show just 24. (with the decimal)
So I included %2.0f which gave me 24 (without the decimal point) what if some one put in 24.556. I got 25 as a result.
Does the width mean how many numbers in total including the decimal point and that is a minimum?
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Jan 12, 2013
One of my programs I recently created, needs higher precision then what doubles can provide. So I am wondering how I install a library like this [URL] .... I don't quite understand exactly how to install them. Im using visual studio 2012 ultimate right now!
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Jan 3, 2015
I don't know why this doesn't work. It doesn't return any errors, but it does the polynomial equation wrong. I tried using "^" instead of "pow" and it still does it wrong. I'm getting results like "-897123897" instead of "3". This is the code:
Code:
#include <stdio.h>
#include <conio.h>
#include <math.h>
int main()
[code]....
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Nov 12, 2014
How to get the derivative of a polynomial.
Code:
#include "p.h"#include <stdio.h>
#include <stdlib.h>
/*----------------------------------------------*/
/* Sets all coefficients to 0 */
/*--------------------------------------------- */
void initialize(Polynomial p)
[Code] .....
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Mar 27, 2014
This program is supposed to find the value of a polynomial
with x being the number of terms
a[x] being the coefficients
b[x] being the exponents in each term
j being the variable
for example if
x=4
a[x]=1,2,1,5
b[x]=3,2,1,0
j=2
then the polynomial is (j*j*j)+2(j*j)+j+5
the value will be 23
however the value computed is wrong in the code below
#include <stdio.h>
#include <math.h>
int main()
[Code].....
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Oct 15, 2014
I wanna write a class for polynomials, but there are some bugs in my code. I want to identify a polynomial with two arrays of the same length, one that contains the exponents of the nonzero monomials, and the other that contains the coefficients itself.
for example: (shematically)
3x^2 +5x^100 shoud be identified by array1=(2,100) and array2=(3,5)
the size of that polynomial should be Dim=2.
it should be possible to change the size dynamically.
Code:
#ifndef poly
#define poly
#include<cassert>
class poly {
[Code] ....
PROBLEM1 the destructor isnt working:
virtual ~poly() {delete [] start;delete [] koef;} //destruktor
Error: This declaration has no Storage class or typ specifier.
Error: Expected an identifier.
PROBLEM2 the constructor isnt working:
poly::poly(int x=0)
Error: Expected an identifier
Error: Expected a )
Error: Expected a ;.
I dont know what the computer want to tell me??
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Apr 20, 2013
I need to make a program that will calculate minimal polynomial of the nxn matrix.
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Nov 30, 2013
I want to extract polynomial coefficient out of a string recieved by input, for example if i enter 4x^3+2x^4+3 , the resulting out put be : 2 , 4 , 0 , 0 , 3
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Feb 27, 2014
So I'm trying to make a derivative calculator that can do simple polynomial calculations in a very specific way. If you read the cout line you'll understand rather quickly.
#include<iostream>
#include<cstdlib>
#include<string>
#include<cstring>
using namespace std;
struct variable {
char Variable,degree,constant;
[Code] ....
I get an error at line 33 and 37 saying error: request for member '_cstr' in 'constant', which is of non-class type 'char'
and the same line with 'degree' instead of constant.
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Mar 18, 2014
I'm try to write a program which define a polynomial using a linked list.
1) I fill every node of the list which list is as long as the value of the max power of the polynomial.
2) I print it out the resulting polynomial.
3) I want to re-scan the poly in search for the polynomials with the same index and sum them each other for having only one element with the same index, for instance, if I enter P(x) = 1 + x + x^2 + 3*x^2 + x^3, I want to obtain:
P(x) = 1 + x + (1 + 3)*x^2 + x^3.
I called this function SeekForSameIndex().
But with this example I have 4x^2 + 4x^2 + x^3, losing the firsts members of the expression, I'm behind this problem for days and I do not understand where's the mistake.
Here my code:
#include <stdio.h>
#include <stdlib.h>
struct SPoly {
int coeff;
unsigned int index;
[Code] ....
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Mar 1, 2015
I am a very very beginner at programming with C. Well, basically i have to generate a real number between 0 and 1 (which as the same as from 0 to 100 k and than dividing everything with 100 k).
Why I am constantly talking about 100 k? Because I would need approx 50 000 random numbers between 0 and 1. My code currently looks something like this:
Code:
int main(int argc, char** argv) { int min,max;
double number;
srand((unsigned)time(NULL));
number = 1 + rand()%100;
printf("The number is: %lf",number);
sleep(2);
return (EXIT_SUCCESS);
}
And If I am not mistaken, should generate numbers between 0 and 100. But I can't figure it out how to change to code in order to get enough numbers.
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Oct 28, 2014
All I want is to let the user enter a value such as .55 or say, .34 and use that in a calculation.
I cannot get passed the errors.
double theRate;
double totalMileage;
double amountOwed;
private void btnCalculate_Click(object sender, EventArgs e)
[Code] ....
So how do you get numeric input from a user?
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Sep 23, 2014
Implementing and manipulating a Polynomial ADT using a linked list.
So far I have:
poly_ADT.h
Code: typedef struct nodeT{
int coef;
int powr;
struct nodeT *next;
} node;
[Code]...
I need to create a function that creates the polynomial using input first.
poly *poly_create (num,...) ;return a new polynomial with num terms terms are listed in order of lowest ordered-term to highest. i.e., to initialize poly 15x^6 + -9x^4 + 3x^2 call poly_create(3, 3,2, -9,4, 15,6 );
Once I do that I need to implement various functions that can manipulate the polynomial itself but I'm having trouble just with creating the polynomial itself, how to do that using a linked list and nodes?
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Feb 7, 2015
I have been writing code to find the roots of a quartic (with coefficients input by the user) by the Newton Rapson method. The method fails if no real roots exist so I have been trying to implement an initial check to see whether the equation has real roots. I've been trying to use the intermediate value theorem but it only works for functions with a positive and negative tail. extend the bounds (fa and fb) to check over many ranges or any other mathematical method of better effect?
Atm I define fa<0<fb where fa=F(-10) and fb=F(10).
#include <stdio.h>
#include <math.h>
#include <conio.h>
#include <stdlib.h>
int a0, a1, a2, a3, a4;
double F(double x) //Sets main function {
return (a0+a1*x+a2*pow(x, 2)+a3*pow(x, 3)+a4*pow(x, 4));
[code].....
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Apr 17, 2015
How i can take data from internet n real time i want make program wich alarm when a specific site(from my university) have a announcement...
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Feb 7, 2014
The program will ask for the user to enter a value for x, then compute the following polynomial: 3x^5 + 2x^4 - 5x^3 - x^2 + 7x - 6.However, when I double check it with my calculator I get a wrong answer for random values of x. To simplify my problem I'm using only integers.
Code:
#include <stdio.h>
int main(void)
{
int x, polynomial;
}
[code]...
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Feb 22, 2015
In main I instantiate two Polynomial objects -- p1 and p2:
int main() {
const int SIZE = 3;
Polynomial *p1 = new Polynomial(SIZE);
Polynomial *p2 = new Polynomial(SIZE);
//Read data into p1
std::cout << "Initialize Polynomial Coefficients (1)" << std::endl;
[Code] .....
The implementation file for Polynomial is as follows:
Polynomial::~Polynomial() {
delete [] this->m_Ptr;
this->m_Ptr = NULL;
} Polynomial::Polynomial(int size) {
[Code] .....
What works: Adding two pointers. The output is correctly produced.
The problem in particular occurs in main when p1 and p2 are attempted to be multiplied. The code attempts to release the memory upon multiplication but I receive a run-time error.
The output for the difference of the two polynomial objects is incorrect. It is displaying addresses.
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