C 結構中的靈活數組成員意味著我們可以在結構中聲明沒有維度的數組,並且其大小本質上是靈活的。靈活數組成員必須是類別的最後一個成員。
下面是一個範例:
#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</p><p>" "Employee Name : %s</p><p>" "Name Length: %d</p><p></p><p>", 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</p><p>", sizeof(struct employee)); return 0; }
Employee_id : 26 Employee Name : Ram Name Length: 3 Employee_id : 53 Employee Name : Madhu Name Length: 5 Size of structure Employee: 12
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