我對編程非常陌生,我正試圖編寫一個程序來增加和減少多項式。我的程序有時可以工作,但大多數時候,它隨機崩潰,我不知道爲什麼。這是非常麻煩的,並且還有其他問題我正在嘗試解決,但是自從它崩潰後,我無法真正地完成任何進一步的編碼。我在這裏是全新的,但任何幫助將不勝感激。如何解決我的程序崩潰在C++中?
下面的代碼:
#include <iostream>
#include <cstdlib>
using namespace std;
int getChoice();
class Polynomial10
{
private:
double* coef;
int degreePoly;
public:
Polynomial10(int max); //Constructor for a new Polynomial10
int getDegree(){return degreePoly;};
void print(); //Print the polynomial in standard form
void read(); //Read a polynomial from the user
void add(const Polynomial10& pol); //Add a polynomial
void multc(double factor); //Multiply the poly by scalar
void subtract(const Polynomial10& pol); //Subtract polynom
};
void Polynomial10::read()
{
cout << "Enter degree of a polynom between 1 and 10 : ";
cin >> degreePoly;
cout << "Enter space separated coefficients starting from highest degree" << endl;
for (int i = 0; i <= degreePoly; i++) cin >> coef[i];
}
void Polynomial10::print()
{
for (int i = 0;i <= degreePoly; i++) {
if (coef[i] == 0) cout << "";
else if (i >= 0) {
if (coef[i] > 0 && i != 0) cout<<"+";
if ((coef[i] != 1 && coef[i] != -1) || i == degreePoly) cout << coef[i];
if ((coef[i] != 1 && coef[i] != -1) && i != degreePoly) cout << "*";
if (i != degreePoly && coef[i] == -1) cout << "-";
if (i != degreePoly) cout << "x";
if ((degreePoly - i) != 1 && i != degreePoly) {
cout << "^";
cout << degreePoly-i;
}
}
}
}
void Polynomial10::add(const Polynomial10& pol)
{
for(int i = 0; i<degreePoly; i++) {
int degree = degreePoly;
coef[degreePoly-i] += pol.coef[degreePoly-(i+1)];
}
}
void Polynomial10::subtract(const Polynomial10& pol)
{
for(int i = 0; i<degreePoly; i++) {
coef[degreePoly-i] -= pol.coef[degreePoly-(i+1)];
}
}
void Polynomial10::multc(double factor)
{
//int degreePoly=0;
//double coef[degreePoly];
cout << "Enter the scalar multiplier : ";
cin >> factor;
for(int i = 0; i<degreePoly; i++) coef[i] *= factor;
}
Polynomial10::Polynomial10(int max)
{
degreePoly = max;
coef = new double[degreePoly];
for(int i; i < degreePoly; i++) coef[i] = 0;
}
int main()
{
int choice;
Polynomial10 p1(1),p2(1);
cout << endl << "CGS 2421: The Polynomial10 Class" << endl << endl << endl;
cout
<< "0. Quit\n"
<< "1. Enter polynomial\n"
<< "2. Print polynomial\n"
<< "3. Add another polynomial\n"
<< "4. Subtract another polynomial\n"
<< "5. Multiply by scalar\n\n";
int choiceFirst = getChoice();
if (choiceFirst != 1) {
cout << "Enter a Polynomial first!";
}
if (choiceFirst == 1) {choiceFirst = choice;}
while(choice != 0) {
switch(choice) {
case 0:
return 0;
case 1:
p1.read();
break;
case 2:
p1.print();
break;
case 3:
p2.read();
p1.add(p2);
cout << "Updated Polynomial: ";
p1.print();
break;
case 4:
p2.read();
p1.subtract(p2);
cout << "Updated Polynomial: ";
p1.print();
break;
case 5:
p1.multc(10);
cout << "Updated Polynomial: ";
p1.print();
break;
}
choice = getChoice();
}
return 0;
}
int getChoice()
{
int c;
cout << "\nEnter your choice : ";
cin >> c;
return c;
}
我做了基本的格式化,我會讓你做其餘的。突出顯示代碼並單擊1010按鈕將其全部縮進四個空格。用4個空格前綴一行表示該行是代碼。 – GManNickG 2010-03-29 04:40:41
如果您可以向我們顯示錯誤消息或打印到屏幕上的內容,這將有所幫助。 – Smashery 2010-03-29 04:42:55
沒有錯誤。只要我嘗試輸入第二個多項式係數,它就會崩潰。程序運行過程中,「Project6已停止工作......」。 會做,GMan。還在習慣這個網站。謝謝。 – Rachel 2010-03-29 04:51:50