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34 lines
871 B
C++
34 lines
871 B
C++
#pragma once
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#include <cstdint>
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#include <limits>
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/// On overlow, the function returns unspecified value.
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inline uint64_t intExp2(int x)
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{
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return 1ULL << x;
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}
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inline uint64_t intExp10(int x)
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{
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if (x < 0)
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return 0;
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if (x > 19)
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return std::numeric_limits<uint64_t>::max();
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static const uint64_t table[20] =
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{
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1ULL, 10ULL, 100ULL,
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1000ULL, 10000ULL, 100000ULL,
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1000000ULL, 10000000ULL, 100000000ULL,
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1000000000ULL, 10000000000ULL, 100000000000ULL,
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1000000000000ULL, 10000000000000ULL, 100000000000000ULL,
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1000000000000000ULL, 10000000000000000ULL, 100000000000000000ULL,
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1000000000000000000ULL, 10000000000000000000ULL
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};
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return table[x];
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}
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