程序改错的题不会写，马上快期末考了，急！

题目:求分段函数y=-1(x<0),y=1(x>0),y=0(x=0)的值
注意:不可以增加或删除程序行，也不可以改写程序结构
#include"stdio.h"
main()
{
int x,y;
scanf("%d",&x);
／ERROR/
if(x<=0)y=-1;
／ERROR**/
else if(x=0)y=0;
else y=1;
printf("x=%d,y=%d\n",x,y);
}

#include"stdio.h"
int  main()
{
int x,y;
scanf("%d",&x);
／ERROR/
if(x<0)y=-1;    //题目是x<0
／ERROR**/
else if(x==0)y=0;   //这里==是等于，=是赋值，要改
else y=1;
printf("x=%d,y=%d\n",x,y);
}

if(x<=0)y=-1;改成if(x<0)y=-1;
else if(x=0)y=0;改成else if(x==0)y=0;

#include"stdio.h"
main()
{
int x,y;
scanf("%d",&x);
//／ERROR/
if(x<=0)y=-1;//x<=0改成x<0
//／ERROR**/
else if(x=0)y=0;//x=0改成x==0
else y=1;
printf("x=%d,y=%d\n",x,y);
}

#include"stdio.h"
main()
{
    int x,y;
    scanf("%d",&x);
    //／ERROR/
    if(x<=0)y=-1;//x<=0改成x<0
    //／ERROR**/
    else if(x=0)y=0;//x=0改成x==0
    else y=1;
    printf("x=%d,y=%d\n",x,y);
}