#include <stdio.h> int main(void) { int a[3][4] = {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}}; printf("%d %d %d %d\n",sizeof((int*)a), sizeof(a), sizeof(a[0]), sizeof(int)); // 8 48 16 4 int i = 1; int j = 3; printf("%d %d %d %d %d\n", a[i][j], (*(a+i))[j], *((int*)(a+i)+j), *((int*)a+i*4+j), *((int*)a+i*sizeof(a[0])/sizeof(int)+j) ); return 0; }