67. constexpr-ii

Question.1

A constexpr function calculates a prescaler with clamping:

constexpr uint16_t calc_prescaler(uint32_t clk, uint32_t freq) {
   uint32_t div = clk / freq;
   if (div > 0xFFFF) return 0xFFFF;
   return static_cast<uint16_t>(div);
}

constexpr uint16_t PS = calc_prescaler(72000000, 1);

What value does PS hold?

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72000000
65535 (0xFFFF) -- the division result (72000000) exceeds 16-bit max, so it is clamped
1
Compilation error -- constexpr cannot use if statements

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