C 发现个全局变量与局部变量的区别

发现个全局变量与局部变量的区别:
[code=C/C++]
char** t;
main()
{
    char c[1];
    char** t1;
    sprintf(c,"%d",t);
    printf("t=%s---\n",c);
    if(strcmp(c,"0")!=0)
    {
        printf("t is Not Null\n");
    }
    sprintf(c,"%d",t1);
    printf("t1=%s---\n",c);
    if(strcmp(c,"0")!=0)
    {
        printf("t1 is Not Null\n");
    }
}
[/code]