c++ - 在我的 C 代码中使用 scanf 进行命令行重定向

Question

我的代码没有读取我想要的文件。是的，我正在使用./a.out < filename它来运行它，但它仍然不读取文件。循环正在工作，但它没有读取文件并执行我告诉它的内容。我scanf错了吗？

我只包含了一部分代码。循环中还有更多内容，这些是来自结构的数组。

int main()
{
    char ch;

    int count_e = 0;
    int count_c = 0 ;

    struct customer arr_cust[50];
    struct employee arr_emp[50];
    //char
    //cout << "hi";
    //scanf("%c", &ch);
    while(scanf("%c", &ch))
    {
        //scanf(" %c", &ch);
        //cout << "yp"; (This is a test. it prints out and the loop is continuous)
        //scanf("%c", &ch);
        cin >> ch;
        cout << ch;
        if (ch == 'e')
        {
            cin >> ch;
            cout << "test";
            ++count_e;
            cin >> arr_emp[count_e].emp_id;
            scanf("%s ", arr_emp[count_e].emp_name); //cin >> arr_emp[count_e].emp_name;
            cout <<  arr_emp[count_e].emp_id << " ";
            printf("%s ", arr_emp[count_e].emp_name);
        }
         if (ch == 'c')
                {
                        ++count_c;
                        cin >> arr_cust[count_c].cust_id;
                        scanf("%s ", arr_cust[count_c].cust_name); //cin >> arr_cust[count_c].cust_name;
                        cin >> arr_cust[count_c].cust_bal;
                        printf("%s ", arr_cust[count_c].cust_name);
                        cout << arr_cust[count_c].cust_name << " ";
                        cout << arr_cust[count_c].cust_id << " ";
                        //++count_c;
                }
                if (ch == 't')
                {
                        int e;
                        int c;
                        char type;
                        float amount;

                        cin >> c;
                        cin >> e;
                        cin >> type;
                        cin >> amount;
                        int index_c;
                        int index_e;

                        for(int k =0; k < count_c; ++k)
                        {
                                if(c == arr_cust[k].cust_id)
                                {
                                        index_c = k;
                                }
                        }
                        for(int j =0; j < count_e; ++j)
                        {
                                if(e == arr_emp[j].emp_id)
                                {
                                    index_e = j;
                                }
                        }
     printf("%s ", arr_cust[index_c].cust_name);
                        //cout << arr_emp[index_e].emp_name << " ";
                        printf("%s ", arr_emp[index_e].emp_name);
                        //cout << arr_cust[index_c].cust_name << " ";
                         if(type == 'w')
                         {
                                cout << "-$";
                                cout << amount << " ";
                                arr_cust[index_c].cust_bal -= amount;
                                cout << " $ " << arr_cust[index_c].cust_bal << endl;
                               // printf(" $ %s ", arr_cust[index_c].cust_bal);
                         }
                        else
                        {
                                cout << "+$";
                                cout << amount << " ";
                                arr_cust[index_c].cust_bal += amount;
                                cout << " $ " << arr_cust[index_c].cust_bal << endl;
                                // printf(" $ %s ", arr_cust[index_c].cust_bal);
                        }
   
    }
    return 0;
}

我试图读取的文件是

e  5 Elden
c  3 Felipe     55342.51415
e  3 Leonardo
e  1 Yong
c  9 Alessandra 8114.541862
c  6 Marnie     15287.78233
e  8 Kourtney
c  2 Lou        95053.44742
c  5 Numbers    51245.66138
e  4 Jarvis
e  9 Marlen
e 10 Florance
c  1 Devon      56442.27875
e  2 Elliott
c  8 Justina    73723.84849
c 10 Reyna      82946.53205
e  6 Antonetta
e  7 Florene
c  4 Merrill    98281.82784
c  7 Marlana    33252.21805
t 1  8 w 4924.86
t 9  6 d 3220.42
t 6  1 w 127.62
t 9  8 w 5566.7
t 9  8 d 5414.55
t 5  7 w 9422.35
t 9 10 d 1382.07
t 4  7 d 6131.07
t 8  2 w 2362.22
t 8 10 d 5834.48
t 5  4 w 5150.73
t 6  2 d 3795.96
t 1  9 w 3919.45
t 5  2 w 5037.31
t 3  9 w 8129.21
t 8  6 d 1235.67
t 2  4 d 6901.28
t 8 10 d 5599.44
t 6  9 d 1936.16
t 7  9 d 7363.98

标签： c++redirectscanf