C Pointer
14 Feb 2019C pointer is powerful that can point to anywhere with good definition. Here are collections of interesting way to use pointer.
| definition | meaning | link |
|---|---|---|
type *i; |
simple pointer | here |
type *i[n]; |
array of n pointer | here |
type (*p)[n]; |
a pointer to an array of n | here |
type (*p)(); |
a pointer to function that return type | here |
type (*p[n])(); |
a pointer to an array of n functions that return type | here |
type *i
int j;
int *i;
i = &j;
*i = 10;
// j == 10
type *i[n]
int j;
int *i[10];
i[0] = &j;
*i[0] = 10;
// j == 10
type (*p)[n]
int i[10];
int (*p)[10];
p = &i;
*p[0] = 10;
*((*p)+1) = 11;
// i = {10,11,?,...,?}
type (*p)()
int test() {
printf("%s\n", "test");
return 1;
}
int main() {
int (*x)();
x = &test;
int z = x();
printf("%d\n", z);
}
//result:
//test
//1
type (*x[n])()
int test() {
printf("%s\n", "test");
return 1;
}
int main() {
int (*x[10])();
x[0] = &test;
int z = x[0]();
printf("%d\n", z);
}
//result:
//test
//1