#include <stdio.h>
void main()
{
    int a[3][4]={1,3,5,7,9,11,13,15,17,19,21,23};
    int *p;
    for(p=a[0];p<a[0]+12;p++)
    {
        if((p-a[0])%4= =0)
            printf("\n");
        printf("%4d",*p);
    }
}

p-a[0]==4,表示相差4个元素

#include <stdio.h>
int main(void) {
    int a[3][4] = {{1, 3, 5, 7}, {9, 11, 13, 15}, {17, 19, 21, 23}};
    int i, *p = (int *)a;
    for(i = 0; i < 12; i++) {
        printf("%4d", *(p + i));
        if(0 == (i + 1) % 4) {
            printf("\n");
        }
    }
    return 0;
}