C++ 为什么要调用隐式删除的默认构造函数？

当我在

main.cpp

中创建Executive对象时，我得到这个错误“调用隐式删除了'Executive'的默认构造函数”。我不知道如何解决它

这是

main.cpp

：

#include <iostream>
#include <fstream>
#include "Executive.h"
using namespace std;

int main(int argc, const char * argv[])
{

    Executive ex;
    ifstream num("Lab01Polynomial.txt");
    ifstream com("Lab01Directives");
    ex.readFiles(num ,com);
    num.close();
    com.close();
    return 0;
}

#include "Executive.h"
#include <fstream>
#include <iostream>
#include "Polynomial.h"
using namespace std;

void Executive::readFiles(std::istream &inpNumber, std::istream &inpInstructions){
    int num_polynomials = 0;
    double coef;
    int poly_size;
    double array[MAX_DEGREE];

    while(!inpNumber.eof() && num_polynomials <= MAX_NUM_POLYNOMIALS){
        inpNumber >> poly_size;
        for(int a = 0; a <= poly_size; a++){
            inpNumber >> coef;
            array[a] = coef;
        }
        Polynomial poly(poly_size, array);
        p[num_polynomials] = poly;
        num_polynomials++;
    }

    string command;
    int poly_index;

    while( !inpInstructions.eof()){
        inpInstructions >> command;
        inpInstructions >> poly_index;

        if(poly_index > num_polynomials){
            cout << "The polynomial doesn't exist" << endl;
        }else if (command == " add"){
            int poly2_index;
            inpInstructions >> poly2_index;
            p[poly_index].add(p[poly2_index]);
        }else if (command == "evaluate"){
            double plugin_value;
            inpInstructions >> plugin_value;
            p[poly_index].evaluate(plugin_value);
        }else if (command == "differentiate"){
            p[poly_index].differentiate();

        }else if(command == "print"){
            p[poly_index].print(std::cout);

        }else
            cout << "Please type a command"<< endl;
    }
}

#include "Polynomial.h"
#include <iostream>
#include <math.h>
using namespace std;


Polynomial::Polynomial(int d, double array[]){
    degree = d;
    for(int a =0; a <= degree; a++){
        array_polynomial[a] = array[a];
    }
}

double Polynomial::evaluate(double x) const{
    double final_value = 0;

    for(int a = 0; a <= degree; a++){
        final_value += array_polynomial[a] * pow(x, a);
    }

    cout << "The polynomial ";
    for(int b = 0; b <= degree; b++){
        if(b == 0){
            cout << array_polynomial[b] << " + ";
        }
        if(b == 1){
            cout << array_polynomial[b] << "x";
        }

        cout << " + " << array_polynomial[b] << "x^" << b;
    }
    cout << " when the value " << x << " is plugged in is " << final_value << endl;;
}

Polynomial Polynomial::add(Polynomial p2) const{
    double sum_array[degree];
    for(int a = 0; a <= degree; a++){
        sum_array[a] = array_polynomial[a] + p2.array_polynomial[a];
    }
    for(int a = 0; a <= degree; a++){
        if ( a== 0){
            cout << sum_array[a] << " + ";
        }else if ( a == 1){
            cout << sum_array[a] << "x";
        }else{
            cout << " + " << sum_array[a] << "x^" << a;
        }
        cout << endl;
    }
}

void Polynomial::print(std::ostream &os) const{
    for(int a = 0; a <= degree; a++){
        if(a == 0){
            os << array_polynomial[a] << " + ";
        }
        else if ( a == 1){
            os << array_polynomial[a] << "x";
        }else{
            os << " + " << array_polynomial[a] << "x^" <<a;
        }
    }
}

Polynomial Polynomial::differentiate() const{
    for(int a = 0; a <= degree; a++){

    }
}

这是

Executive.cpp

：

#include <iostream>
#include <fstream>
#include "Executive.h"
using namespace std;

int main(int argc, const char * argv[])
{

    Executive ex;
    ifstream num("Lab01Polynomial.txt");
    ifstream com("Lab01Directives");
    ex.readFiles(num ,com);
    num.close();
    com.close();
    return 0;
}

#include "Executive.h"
#include <fstream>
#include <iostream>
#include "Polynomial.h"
using namespace std;

void Executive::readFiles(std::istream &inpNumber, std::istream &inpInstructions){
    int num_polynomials = 0;
    double coef;
    int poly_size;
    double array[MAX_DEGREE];

    while(!inpNumber.eof() && num_polynomials <= MAX_NUM_POLYNOMIALS){
        inpNumber >> poly_size;
        for(int a = 0; a <= poly_size; a++){
            inpNumber >> coef;
            array[a] = coef;
        }
        Polynomial poly(poly_size, array);
        p[num_polynomials] = poly;
        num_polynomials++;
    }

    string command;
    int poly_index;

    while( !inpInstructions.eof()){
        inpInstructions >> command;
        inpInstructions >> poly_index;

        if(poly_index > num_polynomials){
            cout << "The polynomial doesn't exist" << endl;
        }else if (command == " add"){
            int poly2_index;
            inpInstructions >> poly2_index;
            p[poly_index].add(p[poly2_index]);
        }else if (command == "evaluate"){
            double plugin_value;
            inpInstructions >> plugin_value;
            p[poly_index].evaluate(plugin_value);
        }else if (command == "differentiate"){
            p[poly_index].differentiate();

        }else if(command == "print"){
            p[poly_index].print(std::cout);

        }else
            cout << "Please type a command"<< endl;
    }
}

#include "Polynomial.h"
#include <iostream>
#include <math.h>
using namespace std;


Polynomial::Polynomial(int d, double array[]){
    degree = d;
    for(int a =0; a <= degree; a++){
        array_polynomial[a] = array[a];
    }
}

double Polynomial::evaluate(double x) const{
    double final_value = 0;

    for(int a = 0; a <= degree; a++){
        final_value += array_polynomial[a] * pow(x, a);
    }

    cout << "The polynomial ";
    for(int b = 0; b <= degree; b++){
        if(b == 0){
            cout << array_polynomial[b] << " + ";
        }
        if(b == 1){
            cout << array_polynomial[b] << "x";
        }

        cout << " + " << array_polynomial[b] << "x^" << b;
    }
    cout << " when the value " << x << " is plugged in is " << final_value << endl;;
}

Polynomial Polynomial::add(Polynomial p2) const{
    double sum_array[degree];
    for(int a = 0; a <= degree; a++){
        sum_array[a] = array_polynomial[a] + p2.array_polynomial[a];
    }
    for(int a = 0; a <= degree; a++){
        if ( a== 0){
            cout << sum_array[a] << " + ";
        }else if ( a == 1){
            cout << sum_array[a] << "x";
        }else{
            cout << " + " << sum_array[a] << "x^" << a;
        }
        cout << endl;
    }
}

void Polynomial::print(std::ostream &os) const{
    for(int a = 0; a <= degree; a++){
        if(a == 0){
            os << array_polynomial[a] << " + ";
        }
        else if ( a == 1){
            os << array_polynomial[a] << "x";
        }else{
            os << " + " << array_polynomial[a] << "x^" <<a;
        }
    }
}

Polynomial Polynomial::differentiate() const{
    for(int a = 0; a <= degree; a++){

    }
}

这是多项式.cpp：

#include <iostream>
#include <fstream>
#include "Executive.h"
using namespace std;

int main(int argc, const char * argv[])
{

    Executive ex;
    ifstream num("Lab01Polynomial.txt");
    ifstream com("Lab01Directives");
    ex.readFiles(num ,com);
    num.close();
    com.close();
    return 0;
}

#include "Executive.h"
#include <fstream>
#include <iostream>
#include "Polynomial.h"
using namespace std;

void Executive::readFiles(std::istream &inpNumber, std::istream &inpInstructions){
    int num_polynomials = 0;
    double coef;
    int poly_size;
    double array[MAX_DEGREE];

    while(!inpNumber.eof() && num_polynomials <= MAX_NUM_POLYNOMIALS){
        inpNumber >> poly_size;
        for(int a = 0; a <= poly_size; a++){
            inpNumber >> coef;
            array[a] = coef;
        }
        Polynomial poly(poly_size, array);
        p[num_polynomials] = poly;
        num_polynomials++;
    }

    string command;
    int poly_index;

    while( !inpInstructions.eof()){
        inpInstructions >> command;
        inpInstructions >> poly_index;

        if(poly_index > num_polynomials){
            cout << "The polynomial doesn't exist" << endl;
        }else if (command == " add"){
            int poly2_index;
            inpInstructions >> poly2_index;
            p[poly_index].add(p[poly2_index]);
        }else if (command == "evaluate"){
            double plugin_value;
            inpInstructions >> plugin_value;
            p[poly_index].evaluate(plugin_value);
        }else if (command == "differentiate"){
            p[poly_index].differentiate();

        }else if(command == "print"){
            p[poly_index].print(std::cout);

        }else
            cout << "Please type a command"<< endl;
    }
}

#include "Polynomial.h"
#include <iostream>
#include <math.h>
using namespace std;


Polynomial::Polynomial(int d, double array[]){
    degree = d;
    for(int a =0; a <= degree; a++){
        array_polynomial[a] = array[a];
    }
}

double Polynomial::evaluate(double x) const{
    double final_value = 0;

    for(int a = 0; a <= degree; a++){
        final_value += array_polynomial[a] * pow(x, a);
    }

    cout << "The polynomial ";
    for(int b = 0; b <= degree; b++){
        if(b == 0){
            cout << array_polynomial[b] << " + ";
        }
        if(b == 1){
            cout << array_polynomial[b] << "x";
        }

        cout << " + " << array_polynomial[b] << "x^" << b;
    }
    cout << " when the value " << x << " is plugged in is " << final_value << endl;;
}

Polynomial Polynomial::add(Polynomial p2) const{
    double sum_array[degree];
    for(int a = 0; a <= degree; a++){
        sum_array[a] = array_polynomial[a] + p2.array_polynomial[a];
    }
    for(int a = 0; a <= degree; a++){
        if ( a== 0){
            cout << sum_array[a] << " + ";
        }else if ( a == 1){
            cout << sum_array[a] << "x";
        }else{
            cout << " + " << sum_array[a] << "x^" << a;
        }
        cout << endl;
    }
}

void Polynomial::print(std::ostream &os) const{
    for(int a = 0; a <= degree; a++){
        if(a == 0){
            os << array_polynomial[a] << " + ";
        }
        else if ( a == 1){
            os << array_polynomial[a] << "x";
        }else{
            os << " + " << array_polynomial[a] << "x^" <<a;
        }
    }
}

Polynomial Polynomial::differentiate() const{
    for(int a = 0; a <= degree; a++){

    }
}

#包括“polynomy.h”
#包括
#包括
使用名称空间std；
多项式：：多项式（int d，双数组[]）{
度=d；
对于（int a=0；a在
多项式
类型中，您提供了一些用户定义的构造函数，这意味着编译器不会提供隐式声明的默认构造函数。这反过来意味着您无法创建
多项式
对象的原始数组。如果需要使用数组If
多项式
，则您需要自己提供一个默认构造函数。
您可以创建一个非默认可构造对象的原始数组，但必须提供一个初始值设定项。@bames53:不作为成员变量（至少不在C++03中，可能也不在C++11中，我必须检查类定义内的成员初始化是否允许这样做）@bames53:我刚刚确认：您可以使用数组，但需要在类内的成员定义中提供聚合初始化的初始化列表…现在考虑到类型需要大小和指针，用户可能没有适当的值来为
Execu中的所有项提供tive:：p
成员定义…所以我甚至不打算将此编辑成答案：）@DavidRodríguez dribeas你是在谈论执行类中的多项式对象吗？可能有某种方法可以使用宏扩展来获得正确数量的初始值设定项。