Floor function / Ceiling function
(Mylib/Number/floor_ceil.cpp)

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• Last update: 2021-04-23 23:44:44+09:00

Operations

Requirements

Notes

Problems

References

Code

#pragma once
#include <cmath>
#include <cstdint>

namespace haar_lib {
  int64_t ceil(int64_t a, int64_t b) {
    if ((a <= 0 and b < 0) or (a >= 0 and b > 0)) return (std::abs(a) + std::abs(b) - 1) / std::abs(b);
    return -(std::abs(a) / std::abs(b));
  }

  int64_t floor(int64_t a, int64_t b) {
    if ((a <= 0 and b < 0) or (a >= 0 and b > 0)) return a / b;
    return -(std::abs(a) + std::abs(b) - 1) / std::abs(b);
  }
}  // namespace haar_lib

#line 2 "Mylib/Number/floor_ceil.cpp"
#include <cmath>
#include <cstdint>

namespace haar_lib {
  int64_t ceil(int64_t a, int64_t b) {
    if ((a <= 0 and b < 0) or (a >= 0 and b > 0)) return (std::abs(a) + std::abs(b) - 1) / std::abs(b);
    return -(std::abs(a) / std::abs(b));
  }

  int64_t floor(int64_t a, int64_t b) {
    if ((a <= 0 and b < 0) or (a >= 0 and b > 0)) return a / b;
    return -(std::abs(a) + std::abs(b) - 1) / std::abs(b);
  }
}  // namespace haar_lib

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