Input decimal
(Mylib/Misc/get_decimal.cpp)

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

Operations

Requirements

Notes

Problems

References

Code

#pragma once
#include <iostream>
#include <string>

namespace haar_lib {
  template <typename T, unsigned int D>
  T get_decimal() {
    T ret      = 0;
    bool minus = false;

    std::string s;
    std::cin >> s;

    auto it = s.begin();

    while (it != s.end() and std::isspace(*it)) {
      it += 1;
    }

    if (it != s.end() and *it == '-') {
      minus = true;
      it += 1;
    }

    while (it != s.end() and std::isdigit(*it)) {
      ret = ret * 10 + (int) (*it - '0');
      it += 1;
    }

    int r = 0;
    if (it != s.end() and *it == '.') {
      it += 1;

      while (r < (int) D and it != s.end() and std::isdigit(*it)) {
        ret = ret * 10 + (int) (*it - '0');
        it += 1;
        r += 1;
      }
    }

    for (int i = 0; i < (int) D - r; ++i) {
      ret = ret * 10;
    }

    if (minus) ret = -ret;

    return ret;
  }
}  // namespace haar_lib

#line 2 "Mylib/Misc/get_decimal.cpp"
#include <iostream>
#include <string>

namespace haar_lib {
  template <typename T, unsigned int D>
  T get_decimal() {
    T ret      = 0;
    bool minus = false;

    std::string s;
    std::cin >> s;

    auto it = s.begin();

    while (it != s.end() and std::isspace(*it)) {
      it += 1;
    }

    if (it != s.end() and *it == '-') {
      minus = true;
      it += 1;
    }

    while (it != s.end() and std::isdigit(*it)) {
      ret = ret * 10 + (int) (*it - '0');
      it += 1;
    }

    int r = 0;
    if (it != s.end() and *it == '.') {
      it += 1;

      while (r < (int) D and it != s.end() and std::isdigit(*it)) {
        ret = ret * 10 + (int) (*it - '0');
        it += 1;
        r += 1;
      }
    }

    for (int i = 0; i < (int) D - r; ++i) {
      ret = ret * 10;
    }

    if (minus) ret = -ret;

    return ret;
  }
}  // namespace haar_lib

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