c语言error c4700,错误error C4700: 使用了未初始化的局部变量“y”

studio中运行 提示 使用了未初始化的局部变量“y” 在VC6.0可以正常运行

求大神解答

以下是程序的局部

void main()

{

char ch1, ch2;

SqStack *s1, *s2;

LQueue *q;

ELEMTP x, y;

s1 = (SqStack *)malloc(sizeof(SqStack));

s2 = (SqStack *)malloc(sizeof(SqStack));

q = (LQueue *)malloc(sizeof (LQueue));

InitStack_Sq(s1);

InitStack_Sq(s2);

InitQueue_L(q);

cout << "-----------------------停车场管理程序----------------------\n";

do{

cout << "1--查看停车场状况 2--车辆到达 3--车辆离开 4--程序结束\n";

cout << "请选择：";

cin >> ch1;

switch (ch1)

{

case '1':

Display(s1, q);

cout << "---------------------------------------------------------------\n";

break;

case '2':

cout << "输入车牌号：";

cin >> x.num;

cout << "输入时间(hh:mm)";

cin >> x.hh.hour;

cin >> ch2;

while (ch2 != ':')

{

cout << "输入到达时间(小时:分钟)";

cin >> x.hh.hour;

cin >> ch2;

};

while (ch2 != ':');

cin >> x.mm.min;

Incar(s1, q, x);

cout << "---------------------------------------------------------------\n";

break;

case '3':

cout << "输入车牌号：";

cin >> x.num;

cout << "输入离开时间(hh:mm)";

cin >> x.hh.hour;

cin >> ch2;

while (ch2 != ':')

{

cout << "输入离开时间(小时:分钟)";

cin >> x.hh.hour;

cin >> ch2;

};

while (ch2 != ':');

cin >> x.mm.min;

Outcar(s1, s2, q, x, y);

cout << "---------------------------------------------------------------\n";

break;

case '4':

cout << "程序结束" << endl;

break;

default:

cout << "输入数据错误，重新输入" << "\n\n\n";

cout << "---------------------------------------------------------------\n";

break;

cin >> ch1;

}

}

while (ch1 != '4');

}