Question

这是我已经编写的代码，但是我希望能够将for循环输出保存到文件中。我尝试使用不同的方法，例如在循环外和循环内在循环周围使用ofstream。但是，即使使用这些代码运行我的代码，它也不会像我想要的那样向文件输出信息。

#include <iostream>
#include <fstream>

using namespace std;

struct MyStruct {
    int number;
    int numbertwo;
};

void printStruct(MyStruct thestruct);

int main(){
    MyStruct alex[4] = {{15, 20},{30, 35},{45, 50},{60, 65}};

    cout<<"Number"<<"\t"<<"Numbertwo"<<endl;

    int sizeofarray = 4;

    for(int x = 0; x < sizeofarray; x = x+1){
        printStruct(alex[x]);
    }
}

void printStruct(MyStruct thestruct){
    for(int x = 0;x < 1; x++)
     if(thestruct.number > 30){
      cout<<thestruct.number*10<<"\t"<<thestruct.numbertwo<<endl;}
     else if(thestruct.number <= 30){
      cout<<thestruct.number*10<<"\t"<<thestruct.numbertwo<<endl;

}

Answer 1

如果将流参数添加到打印功能，则可以选择它的位置。

void printStruct(ostream& os, const MyStruct& thestruct);

int main(){
    MyStruct alex[4] = {{15, 20},{30, 35},{45, 50},{60, 65}};
    int sizeofarray = 4;

    // Print to a file
    ofstream output("results.txt");
    output << "Number" << "\t" << "Numbertwo" << endl;
    for(int x = 0; x < sizeofarray; x = x+1){
        printStruct(output, alex[x]);
    }

    // Print the same to stdout
    cout << "Number" << "\t" << "Numbertwo" << endl;
    for(int x = 0; x < sizeofarray; x = x+1){
        printStruct(cout, alex[x]);
    }

}

void printStruct(ostream& os, const MyStruct& thestruct){
    if(thestruct.number > 30){
        os << thestruct.number*10 << "\t" << thestruct.numbertwo << endl;
    else
        os << thestruct.number*10 << "\t" << thestruct.numbertwo << endl;
}

我将如何保存此forloop的输出

1 个答案: