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法律研究结构中 C 中的可变数组成员
C 中结构的可变数组成员意味着我们可以在结构中声明数组而无需其维度，并且其大小本质上是可变的。可变数组成员必须是类的最后一个成员。
以下是一个示例
示例
#include
#include
#include
//structure of type employee and must contain at least one more named member
in addition to the flexible array member.
struct employee
{
int emp_id;
int name_len;
int emp_size; //‘emp_size’ variable is used to store the size of flexible
character array emp_name[].
char emp_name[]; //Flexible array member emp_name[] should be the last member of class.
};
struct employee *createEmployee(struct employee *e, int id, char a[])
{
e = (struct employee *)malloc( sizeof(*e) + sizeof(char) * strlen(a)); //memory allocation
e->emp_id = id;
e->name_len = strlen(a);
//Assigning size according to size of emp_name which is a copy of user provided
array a[].
strcpy(e->emp_name, a);
return e;
}
void printEmployee(struct employee *e) //print the details of the employee.
{
printf("Employee_id : %d
" "Employee Name : %s
" "Name Length: %d
", e->emp_id, e->emp_name, e->name_len);
}
int main()
{
struct employee *e1 = createEmployee(e1, 26, "Ram");
struct employee *e2 = createEmployee(e2, 53, "Madhu");
printEmployee(e1);
printEmployee(e2);
printf("Size of structure Employee: %lu
",
sizeof(struct employee));
return 0;
}输出
Employee_id : 26 Employee Name : Ram Name Length: 3 Employee_id : 53 Employee Name : Madhu Name Length: 5 Size of structure Employee: 12
更新时间： 2019-07-30
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