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  1. // 固定小数をクラスにしてみた。
  2. #include <iostream>
  3. #include <cmath>
  4. #include <cassert>
  5. #include <limits>
  6.  
  7. #ifdef NDEBUG
  8.     #define check(exp)
  9. #else
  10.     #define check(exp) if (!(exp)) { \
  11.         std::cerr << __FILE__ << "(" << __LINE__ << "): " << \
  12.             #exp << std::endl; \
  13.     }
  14. #endif
  15.  
  16. ///////////////////////////////////////////////////////////////////////////////
  17. // fixed<t_shift>
  18. ///////////////////////////////////////////////////////////////////////////////
  19.  
  20. template <unsigned int t_shift>
  21. struct fixed {
  22.     int m_value;
  23.  
  24.     fixed() {
  25.     }
  26.     fixed(const fixed<t_shift>& f) {
  27.         m_value = f.m_value;
  28.     }
  29.     fixed(int i) {
  30.         m_value = i << t_shift;
  31.     }
  32.     fixed(float f) {
  33.         m_value = (int)(f * (1 << t_shift));
  34.     }
  35.     ~fixed() { }
  36.  
  37.     bool operator!() const {
  38.         return m_value == 0;
  39.     }
  40.  
  41.     int get_mask() const {
  42.         return ((1 << t_shift) - 1);
  43.     }
  44.  
  45.     int get_int_part() const {
  46.         return m_value >> t_shift;
  47.     }
  48.     void set_int_part(int i) {
  49.         m_value = (i << t_shift) | (m_value & get_mask());
  50.     }
  51.  
  52.     int get_decimal_part() const {
  53.         return m_value & get_mask();
  54.     }
  55.     void set_decimal_part(int part) const {
  56.         const int mask = get_mask();
  57.         m_value = (m_value & ~mask) | (part & mask);
  58.     }
  59.  
  60.     float get_float() const {
  61.         return (float)m_value / (float)(1 << t_shift);
  62.     }
  63.     void set_float(float f) {
  64.         m_value = (int)(f * (1 << t_shift));
  65.     }
  66.  
  67.     bool operator==(const fixed<t_shift>& f) const {
  68.         return m_value == f.m_value;
  69.     }
  70.     bool operator!=(const fixed<t_shift>& f) const {
  71.         return m_value != f.m_value;
  72.     }
  73.     bool operator<=(const fixed<t_shift>& f) const {
  74.         return m_value <= f.m_value;
  75.     }
  76.     bool operator>=(const fixed<t_shift>& f) const {
  77.         return m_value >= f.m_value;
  78.     }
  79.     bool operator<(const fixed<t_shift>& f) const {
  80.         return m_value < f.m_value;
  81.     }
  82.     bool operator>(const fixed<t_shift>& f) const {
  83.         return m_value > f.m_value;
  84.     }
  85.  
  86.     bool operator==(int i) const {
  87.         return m_value == (i << t_shift);
  88.     }
  89.     bool operator!=(int i) const {
  90.         return m_value != (i << t_shift);
  91.     }
  92.     bool operator<=(int i) const {
  93.         return m_value <= (i << t_shift);
  94.     }
  95.     bool operator>=(int i) const {
  96.         return m_value >= (i << t_shift);
  97.     }
  98.     bool operator<(int i) const {
  99.         return m_value < (i << t_shift);
  100.     }
  101.     bool operator>(int i) const {
  102.         return m_value > (i << t_shift);
  103.     }
  104.  
  105.     bool operator==(float f) const {
  106.         return m_value == (int)(f * (1 << t_shift));
  107.     }
  108.     bool operator!=(float f) const {
  109.         return m_value != (int)(f * (1 << t_shift));
  110.     }
  111.     bool operator<=(float f) const {
  112.         return m_value <= (int)(f * (1 << t_shift));
  113.     }
  114.     bool operator>=(float f) const {
  115.         return m_value >= (int)(f * (1 << t_shift));
  116.     }
  117.     bool operator<(float f) const {
  118.         return m_value < (int)(f * (1 << t_shift));
  119.     }
  120.     bool operator>(float f) const {
  121.         return m_value > (int)(f * (1 << t_shift));
  122.     }
  123.  
  124.     fixed<t_shift>& operator=(const fixed<t_shift>& f) {
  125.         m_value = f.m_value;
  126.         return *this;
  127.     }
  128.     fixed<t_shift>& operator=(int i) {
  129.         m_value = i << t_shift;
  130.         return *this;
  131.     }
  132.     fixed<t_shift>& operator=(float f) {
  133.         m_value = (int)(f * (1 << t_shift));
  134.         return *this;
  135.     }
  136.  
  137.     fixed<t_shift>& operator+=(const fixed<t_shift>& f) {
  138.         m_value += f.m_value;
  139.         return *this;
  140.     }
  141.     fixed<t_shift>& operator-=(const fixed<t_shift>& f) {
  142.         m_value -= f.m_value;
  143.         return *this;
  144.     }
  145.     fixed<t_shift>& operator*=(const fixed<t_shift>& f) {
  146.         m_value *= f.m_value;
  147.         m_value >>= t_shift;
  148.         return *this;
  149.     }
  150.     fixed<t_shift>& operator/=(const fixed<t_shift>& f) {
  151.         assert(f.m_value != 0);
  152.         m_value <<= t_shift;
  153.         m_value /= f.m_value;
  154.         return *this;
  155.     }
  156.  
  157.     fixed<t_shift>& operator+=(int i) {
  158.         m_value += i << t_shift;
  159.         return *this;
  160.     }
  161.     fixed<t_shift>& operator-=(int i) {
  162.         m_value -= i << t_shift;
  163.         return *this;
  164.     }
  165.     fixed<t_shift>& operator*=(int i) {
  166.         m_value *= i;
  167.         return *this;
  168.     }
  169.     fixed<t_shift>& operator/=(int i) {
  170.         assert(i != 0);
  171.         m_value /= i;
  172.         return *this;
  173.     }
  174.     fixed<t_shift>& operator<<=(int i) {
  175.         m_value <<= i;
  176.         return *this;
  177.     }
  178.     fixed<t_shift>& operator>>=(int i) {
  179.         m_value >>= i;
  180.         return *this;
  181.     }
  182.  
  183.     fixed<t_shift>& operator+=(float f) {
  184.         m_value += (int)(f * (1 << t_shift));
  185.         return *this;
  186.     }
  187.     fixed<t_shift>& operator-=(float f) {
  188.         m_value -= (int)(f * (1 << t_shift));
  189.         return *this;
  190.     }
  191.     fixed<t_shift>& operator*=(float f) {
  192.         m_value = (int)(m_value * f);
  193.         return *this;
  194.     }
  195.     fixed<t_shift>& operator/=(float f) {
  196.         assert(f != 0);
  197.         m_value = (int)(m_value / f);
  198.         return *this;
  199.     }
  200.  
  201.     friend inline fixed<t_shift> operator+(const fixed<t_shift>& f1, int i) {
  202.         fixed<t_shift> f(f1);
  203.         f += i;
  204.         return f;
  205.     }
  206.     friend inline fixed<t_shift> operator-(const fixed<t_shift>& f1, int i) {
  207.         fixed<t_shift> f(f1);
  208.         f -= i;
  209.         return f;
  210.     }
  211.     friend inline fixed<t_shift> operator*(const fixed<t_shift>& f1, int i) {
  212.         fixed<t_shift> f(f1);
  213.         f *= i;
  214.         return f;
  215.     }
  216.     friend inline fixed<t_shift> operator/(const fixed<t_shift>& f1, int i) {
  217.         fixed<t_shift> f(f1);
  218.         f /= i;
  219.         return f;
  220.     }
  221.     friend inline fixed<t_shift> operator+(
  222.         const fixed<t_shift>& f1, const fixed<t_shift>& f2)
  223.     {
  224.         fixed<t_shift> f(f1);
  225.         f += f2;
  226.         return f;
  227.     }
  228.     friend inline fixed<t_shift> operator-(
  229.         const fixed<t_shift>& f1, const fixed<t_shift>& f2)
  230.     {
  231.         fixed<t_shift> f(f1);
  232.         f -= f2;
  233.         return f;
  234.     }
  235.     friend inline fixed<t_shift> operator*(
  236.         const fixed<t_shift>& f1, const fixed<t_shift>& f2)
  237.     {
  238.         fixed<t_shift> f(f1);
  239.         f *= f2;
  240.         return f;
  241.     }
  242.     friend inline fixed<t_shift> operator/(
  243.         const fixed<t_shift>& f1, const fixed<t_shift>& f2)
  244.     {
  245.         fixed<t_shift> f(f1);
  246.         f /= f2;
  247.         return f;
  248.     }
  249.     friend inline fixed<t_shift> operator<<(const fixed<t_shift>& f1, int i) {
  250.         fixed<t_shift> f(f1);
  251.         f <<= i;
  252.         return f;
  253.     }
  254.     friend inline fixed<t_shift> operator>>(const fixed<t_shift>& f1, int i) {
  255.         fixed<t_shift> f(f1);
  256.         f >>= i;
  257.         return f;
  258.     }
  259. };
  260.  
  261. template <unsigned int t_shift>
  262. std::ostream&
  263. operator<<(std::ostream& o, const fixed<t_shift>& f) {
  264.     return (o << f.get_float());
  265. }
  266.  
  267. ///////////////////////////////////////////////////////////////////////////////
  268.  
  269. #ifdef __BORLANDC__
  270.     #pragma option -w-8027
  271. #endif
  272.  
  273. int main(void)
  274. {
  275.     fixed<8> f1(1.2f), f2(3.4f), f;
  276.  
  277.     int i = 3;
  278.     f = f1 + i;
  279.     std::cout << "1.2 + 3 = " << f << std::endl;
  280.     f = f1 - i;
  281.     std::cout << "1.2 - 3 = " << f << std::endl;
  282.     f = f1 * i;
  283.     std::cout << "1.2 * 3 = " << f << std::endl;
  284.     f = f1 / i;
  285.     std::cout << "1.2 / 3 = " << f << std::endl;
  286.  
  287.     f = f1 + f2;
  288.     std::cout << "1.2 + 3.4 = " << f << std::endl;
  289.     f = f1 - f2;
  290.     std::cout << "1.2 - 3.4 = " << f << std::endl;
  291.     f = f1 * f2;
  292.     std::cout << "1.2 * 3.4 = " << f << std::endl;
  293.     f = f1 / f2;
  294.     std::cout << "1.2 / 3.4 = " << f << std::endl;
  295.  
  296.     f = 1.2f;
  297.     f += 2;
  298.     std::cout << "1.2 + 2 = " << f << std::endl;
  299.     f = 1.2f;
  300.     f -= 2;
  301.     std::cout << "1.2 - 2 = " << f << std::endl;
  302.     f = 1.2f;
  303.     f *= 2;
  304.     std::cout << "1.2 * 2 = " << f << std::endl;
  305.     f = 1.2f;
  306.     f /= 2;
  307.     std::cout << "1.2 / 2 = " << f << std::endl;
  308.  
  309.     return 0;
  310. }
Success #stdin #stdout 0.01s 2724KB
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1.2 + 3 = 4.19922
1.2 - 3 = -1.80078
1.2 * 3 = 3.59766
1.2 / 3 = 0.398438
1.2 + 3.4 = 4.59766
1.2 - 3.4 = -2.19922
1.2 * 3.4 = 4.07422
1.2 / 3.4 = 0.351562
1.2 + 2 = 3.19922
1.2 - 2 = -0.800781
1.2 * 2 = 2.39844
1.2 / 2 = 0.597656
https://ideone.com/x2uolH
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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