Вот main.c:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int size = atoi(argv[1]);
int int_array[10][10];
int *before = NULL;
int *val[size];
int *after = NULL;
printf("before:%p, after:%p, sizeof val:%lu\n", before, after, sizeof val);
int i = 0;
/*for (; i < 10; i++) {
val[i] = int_array[i];
}*/
val[0] = int_array[0];
val[1] = int_array[3];
printf("int_array:%p, int_array[0]:%p, int_array[1]:%p, int_array[2]:%p, int_array[3]:%p\n", int_array, int_array[0], int_array[1], int_array[2], int_array[3]);
printf("val:%p, val[0]:%p, val[1]:%p, val[2]:%p, val[3]:%p\n", val, val[0], val[1], val[2], val[3]);
printf("before:%p, after:%p\n", before, after);
return 0;
}
[root@localhost test]# ./test 3
before:(nil), after:(nil), sizeof val:24
int_array:0x7ffeadc69470, int_array[0]:0x7ffeadc69470, int_array[1]:0x7ffeadc69498, int_array[2]:0x7ffeadc694c0, int_array[3]:0x7ffeadc694e8
val:0x7ffeadc69440, val[0]:0x7ffeadc69470, val[1]:0x7ffeadc694e8, val[2]:0x3, val[3]:0x4005ba
before:(nil), after:(nil)
[root@localhost test]# ./test 6
before:(nil), after:(nil), sizeof val:48
int_array:0x7ffcd30f1f50, int_array[0]:0x7ffcd30f1f50, int_array[1]:0x7ffcd30f1f78, int_array[2]:0x7ffcd30f1fa0, int_array[3]:0x7ffcd30f1fc8
val:0x7ffcd30f1f00, val[0]:0x7ffcd30f1f50, val[1]:0x7ffcd30f1fc8, val[2]:0x7ffcd30f2220, val[3]:(nil)
before:(nil), after:(nil)
скомпилируйте код: gcc -o test main.c, затем я получил вывод выше ./test 3 и ./test 6. так, это не время компиляции, а время выполнения, когда определяется sizeof()
?