数组参数                           等效的指针参数一位数组 char a[30]                指针 char *指针数组 char *a[30]               指针的指针  char **a二维数组 char a[10][30]            数组的指针  char(*a)[30]                    char *a[30]    //指针数组char (*a)[30]  //数组指针