1int main() {
2    int* pa = (int*) malloc(100);
3    int* pb = pa + 1;
4    int* pc = (int*) 0;
5    *pa = 1;
6    *pb = 2;
7    printf("Pointer difference: %d %d\n", pb - pa, ((int) pb) - ((int) pa));
8    int c = * (pa + 1);
9    printf("Pointer addition: %d\n", c);
10    printf("Pointer comparison to zero: %d %d %d\n", pa == 0, pb == 0, pc == 0);
11    printf("Pointer comparison: %d %d %d %d %d\n", pa < pb, pa == pb, pa > pb, ! pb, ! pc);
12    free(pa);
13    return 0;
14}
15
16