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int a[4] = {1,2,3,4};
int b[4] = {5,6,7,18};
// double c = 20.3;
printf("a[-1] is %d\n",a[-1]);
printf("a[-4] is %d\n",a[-4]);
printf("b[4] is %d\n",b[4]);
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a[-1] is 18
a[-4] is 5
b[4] is 1
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