我这个程序在WinCC全局脚本里面怎么编译错误，麻烦大家帮我指点指点，谢谢》

BOOL x,y,z;
x=GetTagBit("S7$程序(1)/start1"); //Return-Type: BOOL
y=GetTagBit("S7$程序(1)/stop1"); //Return-Type: BOOL
z=GetVisible(lpszPictureName,lpszObjectName); //Return-Type: BOOL

if(x==1 y==0)
{
SetVisible(lpszPictureName,"Control4",1); //Return-Type: BOOL
SetVisible(lpszPictureName,"Control3",0); //Return-Type: BOOL
}

if(x==0 y==1)
{
SetVisible(lpszPictureName,"Control4",0); //Return-Type: BOOL
SetVisible(lpszPictureName,"Control3",1); //Return-Type: BOOL
}

if(x==0 y==0)
{
SetVisible(lpszPictureName,"Control4",0); //Return-Type: BOOL
SetVisible(lpszPictureName,"Control3",1); //Return-Type: BOOL
}