我的任务是创建一个称为Polynomial的C ++类，该类将不同的数学公式应用于多项式。我得到了4个单独的代码位，这些代码必须与程序的其余部分一起使用，而且我不太了解我应该如何在整个函数中使用这些包装器。例如在我的打印功能和访问多项式中隐藏的多层。
预制1：
#ifndef __GUARDED_ARRAY_H__
#define __GUARDED_ARRAY_H__
using namespace std;
typedef int ItemType;
const unsigned MAX_LENGTH = 500;
//
// GuardedArray
// - A wrapper class for C++ arrays to make array access safe.
// Specifically, initialization is guaranteed, and assertions are
// in place to detect array index out of bound errors in array member
// accesses.
//
class GuardedArray {
public:
// Purpose: Initializes array elements to zeros
GuardedArray();
// Purpose: Initializes all array elements to a given value
GuardedArray(ItemType x);
// Purpose: Read array element at index i
ItemType read(unsigned i) const;
// Purpose: Write x into array element at index i.
void write(unsigned i, ItemType x);
private:
ItemType array[MAX_LENGTH];
};
#endif
预制2：
#include <cassert>
#include "polynomial.h"
#include "guarded_array.h"
#include "managed_array.h"
GuardedArray::GuardedArray() {
for (unsigned i = 0; i < MAX_LENGTH; i++)
array[i] = 0;
}
GuardedArray::GuardedArray(ItemType x) {
for (unsigned i = 0; i < MAX_LENGTH; i++)
array[i] = x;
}
ItemType GuardedArray::read(unsigned i) const {
assert(i < MAX_LENGTH);
return array[i];
}
void GuardedArray::write(unsigned i, ItemType x) {
assert(i < MAX_LENGTH);
array[i] = x;
}
预制3：
#ifndef __MANAGED_ARRAY_H__
#define __MANAGED_ARRAY_H__
#include "guarded_array.h"
using namespace std;
//
// ManagedArray
// - A wrapper class for C++ arrays to facilitate insertion and removal of
// array elements.
// - Every instance of ManagedArray has a size that can be increased
// until the maximum capacity MAX_LENGTH is reached.
//
class ManagedArray {
public:
// Purpose: Initializes array to have zero size.
ManagedArray();
// Purpose: Initializes array to a given size. All array elements
ManagedArray(unsigned N);
// Purpose: Initializes array to a given size. All array elements
// are initialized to x.
ManagedArray(unsigned N, ItemType x);
// Purpose: Return the current size of the array.
unsigned size() const;
// Purpose: Read array element at index i
ItemType read(unsigned i) const;
// Purpose: Write x into array element at index i.
void write(unsigned i, ItemType x);
// Purpose: Insert an element into the array.
void insert(unsigned i, ItemType x);
// Purpose: Remove an element from the array.
void remove(unsigned i);
private:
unsigned count;
GuardedArray array;
};
#endif
预制4：
#include <cassert>
#include "polynomial.h"
#include "guarded_array.h"
#include "managed_array.h"
ManagedArray::ManagedArray() : array() {
count = 0;
}
ManagedArray::ManagedArray(unsigned N) : array() {
assert(N <= MAX_LENGTH);
count = N;
}
ManagedArray::ManagedArray(unsigned N, ItemType x) : array(x) {
assert(N <= MAX_LENGTH);
count = N;
}
unsigned ManagedArray::size() const {
return count;
}
ItemType ManagedArray::read(unsigned i) const {
assert(i < count);
return array.read(i);
}
void ManagedArray::write(unsigned i, ItemType x) {
assert(i < count);
array.write(i, x);
}
void ManagedArray::insert(unsigned i, ItemType x) {
assert(i <= count && count < MAX_LENGTH);
for (unsigned j = count; j > i; j--)
array.write(j, array.read(j - 1));
array.write(i, x);
count++;
}
void ManagedArray::remove(unsigned i) {
assert(i < count && count > 0);
for (unsigned j = i; j < count - 1; j++)
array.write(j, array.read(j + 1));
count--;
}
这是我自己的代码，必须更改以适应上述代码：
#include "polynomial.h"
using namespace std;
int main()
{
Polynomial poly1;
poly1.print();
/* Calculate all of these:
The zero polynomial.
The degree of the zero polynomial.
The value of the zero polynomial when x = 1.
The polynomial P(x) = -1 + 3x^2 - 2x^5.
The degree of P(x).
The value of P(1) and P(-2).
The polynomial Q(x) = 1 + x^3 + 2x^5.
The polynomial P(x) +Q(x).
The polynomial P(x) - Q(x).
The polynomial 4P(x).
The polynomial x^2Q(x).
The polynomial P(x)Q(x).
*/
system("pause");
return 0;
}
标题：
#ifndef POLYNOMIAL_H
#define POLYNOMIAL_H
#include <iostream>
#include <cassert>
#include <iomanip>
#include "managed_array.h"
using namespace std;
//
// Polynomial class
//
//Purpose- To hold and calculate specific polynomial equations
//
//Parameter(s)-
// -None OR
// -An array of coefficients and the size of the array OR
// -An instance of Polynomial to copy into a new instance
//Precondition(s)- In the array/array size constructor the last element of the array must be non-zero
//
//Returns- N/A
//
//Side Effect- Holds all functions required to intialize, hold, and calculate specific polynomial equations
//
//
class Polynomial
{
private:
ManagedArray polynomial;
public:
Polynomial(); //Default constructor
/*
second constructor takes an integer array and an integer array size as arguments, and initializes the target Polynomial
instance with coefficients identical to the elements of the array
A precondition for this operation is that the last element of the array must be non-zero, or else the array size is zero.
*/
Polynomial(int array[], const unsigned int size);
/*
A third constructor expects a Polynomial instance as its sole argument, and initializes the target Polynomial
instance with coefficients identical to those in the argument Polynomial.
*/
//Polynomial();
//Purpose- Apply the Polynomial function to an integer argument.That is, compute the value of the Polynomial for a given value of x.
void evaluate();
//Purpose- An arithmetic addition operation that adds one instance of Polynomial to another.
void add(const Polynomial& poly2);
//Purpose- An arithmetic subtraction operation that subtracts one instance of Polynomial by another.
void subtract();
//Purpose- An arithmetic multiplication operation that multiplies one instance of Polynomial by another.
void multiply();
//Purpose- An arithmetic multiplication operation that multiplies an instance of Polynomial by an integer.
//void multiply();
//Purpose- An arithmetic multiplication operation that multiplies an instance of Polynomial by a polynomial of the form x^k for some non-negative integer k
void raiseDegree();
//Purpose- A Boolean operation that compares two instances of Polynomial to determine if they are identical.
bool equal();
//Purpose- Get the degree of a Polynomial instance.
int getDegree();
//Purpose- Retrieve the coefficient of the term x^k in a Polynomial instance, given a non-negative integer k.
int getCoefficient();
//Purpose- Print a Polynomial instance in a user-friendly format.
void print() const;
//The polynomial (-3 + 4x - 7x^3) should be printed in the following format.- 3 + 4 x - 7 x^3
};
#endif
cpp：
#include "polynomial.h"
#include "managed_array.h"
#include "guarded_array.h"
unsigned int i;
Polynomial::Polynomial()
{
ManagedArray();
GuardedArray();
}
Polynomial::Polynomial(int array[], const unsigned int size)
{
ManagedArray(size);
for (i = 0; i < size; i++)
{
int temp = array[i];
GuardedArray(temp);
}
}
//Polynomial::Polynomial()
//{
//
//}
void Polynomial::evaluate()
{
}
void Polynomial::add(const Polynomial& poly2)
{
}
void Polynomial::subtract()
{
}
void Polynomial::multiply()
{
}
//void Polynomial::multiply()
//{
//
//}
void Polynomial::raiseDegree()
{
}
bool Polynomial::equal()
{
return false;
}
int Polynomial::getDegree()
{
return -1;
}
int Polynomial::getCoefficient()
{
return -1;
}
void Polynomial::print() const
{
}
答案 0 :(得分：0)
您只需要处理polynomial类中的数据成员Polynomial，该数据成员表示多项式的系数。
例如，polynomial.read(2)应该返回项x ^ 2的系数
要开始使用，请访问 polynomial.cpp
Polynomial::Polynomial()
:polynomial() {}
Polynomial::Polynomial(int array[], const int size)
:polynomial(size)
{
for (int i = 0; i < size; ++i)
polynomial.write(i, array[i]);
}
double Polynomial::evaluate(double x) const
{
double sum = 0;
for (int i = 0; i < polynomial.size(); ++i)
sum += polynomial.read(i) * pow(x, i);
return sum;
}