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integer literal
see the program
1500
80 is an integer. If you are asking for the Celsius equivalent of 80°F, then the answer is 26.555...°C
Yes, see the C99 ISO standard §6.5.2.1/2. Assuming a pointer "a" into an allocated array, a[-1] is equivalent to *(a - 1). Naturally, if (a - 1) points to an unallocated memory location, you get undefined behavior.