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#include <stdio.h>
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void show_int_array(int [], int);
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int main(void)
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{
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   int arr[4] = {100, 200, 300, 400};//assume arr is at 0022FF60
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   int *ptr1, *ptr2;//assume ptr1 and ptr2 are at 0022FF5C and 0022FF58 
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   ptr1 = arr;//points to arr[0]==100
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   ptr2 = &arr[3];//points to arr[3]==400
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   printf("&ptr1:%p, ptr1:%p, *ptr1:%d\n", &ptr1, ptr1, *ptr1);
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   printf("&ptr2:%p, ptr2:%p, *ptr2:%d\n\n", &ptr2, ptr2, *ptr2);
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   show_int_array(arr, 4);   
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   ptr1++;  *ptr1 = 201;
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   ptr2--;  *ptr2 = 301;
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   printf("\nAfter ptr1++, ptr2--, ");  
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   printf("*ptr1 = 201, *ptr2 = 301\n");
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   printf("&ptr1:%p, ptr1:%p, *ptr1:%d\n", &ptr1, ptr1, *ptr1);
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   printf("&ptr2:%p, ptr2:%p, *ptr2:%d\n\n", &ptr2, ptr2, *ptr2);
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   show_int_array(arr, 4);
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   return 0;   
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}
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void show_int_array(int a[], int n)
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{
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   int *ip;
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   for (ip = a; ip < (a+n); ip++) {
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      printf("| %p ", ip);
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   }
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   printf(" |\n");
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   for (ip = a; ip < (a+n); ip++) {
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      printf("| %8d ", *ip);
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   }
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   printf(" |\n");   
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}