#include<stdio.h>
void pointer1(int x,int y)
{
    int t=1;
        x=x+t;y=y+t;
    return;
}
void pointer2(int *x,int *y)
{
    int t=1;
    *x=*x+t;
    *y=*y+t;
    return;
}
void pointer3(char *p)
{
    p+=2;
    *p=*p+1;
}
void main()
{
    char b[4]={'a','v','w','z'},*pt=b;
    int x=2,y=3;
    pointer1(x,y);
    printf("x=%d y=%d\n",x,y);
    pointer2(&x,&y);
    printf("x=%d y=%d\n",x,y);
    pointer3(pt);
    printf("*(pt+2)=%c \n",*(pt+2));
}
point1(x,y)为何输出的是2，3而不是2，4
pointer3(pt)为何输出的是x  ??