char **argv
argv: pointer to char
int *daytab[12]
daytab: 12 pointers to int //一个数组有12个指针,都指向整形
int (*daytab)[12]
daytab:pointer to array[12] of int //一个指针,指向有12个整数的数组
void *comp()
comp:返回空指针的函数 //指针函数,返回值void *
void (*comp)() // void print(){printf("helloworld");} comp = print;
comp:指向返回值为空的函数指针 //函数指针,