Question

仅供参考，我声明了一个类调用UC，在UC中我声明了一个变量调用course及其一个数组[4]，这与我现在面临的问题有关。转到我评论为问题的行，我现在所知道的是行for(UC &i :: one.course)是错误的，尤其是UC，这行代码应执行course[4]的forloop，但事实并非如此，只是显示类似i has not been declared的错误。我的预期输出就在那儿。

#include <iostream>
#include <string>

using namespace std;

class UC{
public:

    string name;
    int history;
    string founder;
    string course[4];
};

void print(string, int, string);

int main()
{


    UC one;
    one.name = "ABC";
    one.history = 5;
    one.founder = "Mr.Chong";
    one.course[0] = "IT";
    one.course[1] = "Interior Design";
    one.course[2] = "Mass Comm";
    one.course[3] = "Business";


    print(one.name, one.history, one.founder);
    cout<<"Our Course: ";

//problem here//
    string delim = "";

    for(UC &i :: one.course){
      cout<< delim <<i;
      delim = ", ";
    };   
//problem here//

    return 0;
}

void print(string r, int x, string y){
    cout<<"Our College Name: "<<r<<endl;
    cout<<"Our History: "<<x<<endl;
    cout<<"Our Founder: "<<y<<endl;
};

我希望输出会像

我们的大学名称：ABC

我们的历史：5

我们的创始人：庄先生

我们的课程：IT，室内设计，大众传播，商业

//此行不起作用

Answer 1

您的问题部分可以如下所示，以使用for循环打印出一个数组：

#include <iostream>
#include <string>

using namespace std;

class UC{
public:
    string name;
    int history;
    string founder;
    string course[4];
};

void print(string, int, string);

int main()
{
    UC one;
    one.name = "ABC";
    one.history = 5;
    one.founder = "Mr.Chong";
    one.course[0] = "IT";
    one.course[1] = "Interior Design";
    one.course[2] = "Mass Comm";
    one.course[3] = "Business";

    print(one.name, one.history, one.founder);

    cout<<"Our Course: ";

    //problem here

    int numberofelements = sizeof(one.course)/sizeof(one.course[0]);

    for (int i = 0; i < numberofelements; i++){
        if(i == numberofelements-1){
            cout << one.course[i];
        }
        else{
            cout << one.course[i] << ", ";
        }
    }

    // problem here

    return 0;
}

void print(string r, int x, string y){
    cout<<"Our College Name: "<<r<<endl;
    cout<<"Our History: "<<x<<endl;
    cout<<"Our Founder: "<<y<<endl;
};

或者，如果您想要一种更简洁的方法，则可以修改void print方法，以采用将传递到方法主体中的for循环中的数组参数并打印出数组元素。

如何for循环一个类变量数组？

1 个答案: