使用fstream的程序将不合规

Question

#include<iostream>
#include<fstream>
#include<string>
#include<iomanip>
using namespace std;
class InsurancePolicy
{
    friend fstream&  operator<<(fstream&, InsurancePolicy);
    friend istream& operator>>(istream&, InsurancePolicy&);
private:
    int policyNum;
    string lastName;
    int value;
    int premium;
};
fstream& operator<<(fstream& out, InsurancePolicy pol)
{
    out << pol.policyNum << " " << pol.lastName << " " << pol.value << " " << pol.premium << endl;
    return out;
}
istream& operator>>(istream& in, InsurancePolicy& pol)
{
    in >> pol.policyNum >> pol.lastName >> pol.value >> pol.premium;
    return in;
}
int main()
{
    ofstream outfile;
    outFile.open("Policy.txt");
    Policy aPolicy[10];
    for (int count = 0; count < 10; ++count)
    {
        printf("Enter the policy number, the holder's last name, the value, and the premium.");
        cin >> aPolicy[count];
        outfile << aPolicy[count] << endl;
    }

}此程序应从键盘接受值并将它们打印到文件中。 但是，它给出了许多语法错误。

严重性代码说明项目文件行抑制状态错误C2065'outFile'：未声明的标识符Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 39

错误'.open'左边的错误C2228必须具有class / struct / union Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 39

错误C2065“政策”：未声明的标识符Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 40

错误C2146语法错误：缺少';' 标识符'aPolicy'Project6之前c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 40

错误C2065'aPolicy'：未声明的标识符Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 40

错误C2065'aPolicy'：未声明的标识符Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 44

错误C2065'aPolicy'：未声明的标识符Project6 c：\\ users \\ preston freeman \\ source \\ repos \\ jave.cpp 45

如何解决这些错误？ 感谢您的时间？

Answer 1

代码中有很多错别字，但是主要的问题是从fstream到ofstream没有已知的转换，因此这是代码的正确版本：

#include <iostream>
#include <fstream>
using namespace std;
class InsurancePolicy
{
    friend ofstream&  operator<<(ofstream&, InsurancePolicy);
    friend istream& operator>>(istream&, InsurancePolicy&);
private:
    int policyNum;
    string lastName;
    int value;
    int premium;
};
ofstream& operator<<(ofstream& out, InsurancePolicy pol)
{
    out << pol.policyNum << " " << pol.lastName << " " << pol.value << " " << pol.premium << endl;
    return out;
}
istream& operator>>(istream& in, InsurancePolicy& pol)
{
    in >> pol.policyNum >> pol.lastName >> pol.value >> pol.premium;
    return in;
}
int main() {
    ofstream outFile;
    outFile.open("Policy.txt");
    InsurancePolicy aPolicy[10];
    for (int count = 0; count < 10; ++count)
    {
        printf("Enter the policy number, the holder's last name, the value, and the premium.");
        cin >> aPolicy[count];
        outFile << aPolicy[count]<<std::endl;
    }
    return 0;

}