#include <stdio.h>
int main(void) {
int num[4]={1,2,3,4};
int *pt=num;
pt++;
*pt++=5;
*pt++=10;
pt--;
*pt=*pt+20;
pt++;
printf("%d,%d,%d,%d",num
[0],num
[1],num
[2],num
[3]); }
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