【问题标题】:Passing structure in a function在函数中传递结构
【发布时间】:2020-02-01 09:47:48
【问题描述】:

以下代码在编译时报错:

int add_employee(struct emp e)
     {
        printf("%i\n", e.emp_no);
        printf("Date of Birth:\n");
        printf("%i / %i / %i\n", e.birth_date.dd, e.birth_date.mm, e.birth_date.yyyy);
        printf("%s %s\n", e.first_name, e.last_name);
        printf("%s\n", e.gender);
        printf("Date of Hirting:\n");
        printf("%i / %i / %i\n", e.hire_date.dd, e.hire_date.mm, e.hire_date.yyyy);
        return 0;
    }

    int main()
    {
        struct employees emp, *ptr;
        ptr = &emp;
        int i=0;
        ptr->emp_no = get_int("Employee No.: ");
        printf("Date of Birth:\n");
        ptr->birth_date.dd = get_int("Date: ");
        ptr->birth_date.mm = get_int("Month: ");
        ptr->birth_date.yyyy = get_int("Year: ");
        ptr->first_name = get_string("First Name: ");
        ptr->last_name = get_string("Last Name: ");
        ptr->gender = get_string("Gender(M/F): ");
       printf("Date of Hiring:\n");
       ptr->hire_date.dd = get_int("Date: ");
       ptr->hire_date.mm = get_int("Month: ");
       ptr->hire_date.yyyy = get_int("Year: ");
      i = add_employee(emp);
       if(i == 0)
       {
           printf("Employee added successfully\n");
       }

以下是我使用 clang 编译时的错误:

app.c:75:25: 警告:“struct emp”的声明在此函数之外不可见 [-Wvisibility]乙>
int add_employee(struct emp e)
 ^
app.c:75:29: 错误:变量的类型不完整'struct emp'
int add_employee(struct emp e)
 ^
app.c:75:25: 注意:'struct emp' 的前向声明
int add_employee(struct emp e)
 ^
app.c:104:22: 错误:参数类型'struct emp'不完整
    i = add_employee(emp);
 ^~~
app.c:75:25: 注意:'struct emp' 的前向声明
int add_employee(struct emp e)
 ^
生成 1 个警告和 2 个错误。

【问题讨论】:

  • struct emp 定义在哪里?这就是编译器所担心的。

标签: c function structure


【解决方案1】:

main中的行

struct employees emp, *ptr;

类型好像是struct employees

所以功能应该是

int add_employee(struct employees e)

【讨论】:

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