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fixpoint: implementacion de numero de punto fijo
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1 <?xml version="1.0" encoding="UTF-8"?>
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1 /*
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2 * fixpoint<T>.h
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3 *
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4 * Created on: Feb 24, 2015
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5 * Author: aras
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6 */
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7
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8 #ifndef FIXPOINT_H_
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9 #define FIXPOINT_H_
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10
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11 #include <inttypes.h>
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12 #include <math.h>
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13 #include <typeinfo>
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14 #include <cstdio>
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15
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16
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17
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18
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19 template<class T>
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20 class fixpoint {
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21
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22 private:
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23 uint8_t factor;
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24 T value;
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25
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26 public:
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27 fixpoint<T>(const fixpoint<T>& fp){factor=fp.factor;value=fp.value;};
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28 fixpoint<T>(uint8_t dec);
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29 fixpoint<T>(uint8_t dec,T num);
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30
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31 void set_from_float(float num){value=T(num*(1<<factor));}
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32 void set(T val){value = val;}
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33 float tofloat();
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34
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35
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36 friend inline fixpoint<T> operator-(const fixpoint<T> &num1, const fixpoint<T> &num2){
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37 return fixpoint<T>(num1.factor,num1.value-num2.value);
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38 }
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39 friend inline fixpoint<T> operator+(const fixpoint<T> &num1, const fixpoint<T> &num2){
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40 return fixpoint<T>(num1.factor,num1.value+num2.value);
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41 }
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42 friend inline fixpoint<T> operator*(const fixpoint<T> &num1, const fixpoint<T> &num2){
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43 int64_t aux = (int64_t(num1.value)*int64_t(num2.value))>>num1.factor;
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44 return fixpoint<T>(num1.factor,T(aux));
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45 }
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46 friend inline fixpoint<T> operator/(const fixpoint<T> &num1, const fixpoint<T> &num2){
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47 int64_t aux = (int64_t(num1.value)<<num1.factor);
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48 return fixpoint<T>(num1.factor,aux/num2.value);
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49 }
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50
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51
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52 //fixpoint<T>& operator= ( const fixpoint<T>& );
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53
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54 inline fixpoint<T> power();
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55 inline fixpoint<T> sqroot();
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56 };
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57
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58
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59 //template<class T>
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60 //fixpoint<T> & fixpoint<T>::operator= ( fixpoint<T> ){
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61 //
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62 //}
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63
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64
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65
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66
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67 template<class T>
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68 fixpoint<T>::fixpoint(uint8_t dec){
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69 factor=dec;
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70 value=0;
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71 }
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72
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73 template<class T>
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74 fixpoint<T>::fixpoint(uint8_t dec,T num){
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75 factor=dec;
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76 value=num;
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77 }
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78
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79
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80 template<class T>
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81 float fixpoint<T>::tofloat(){
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82 return float(value)/(1<<factor);
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83 }
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84
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85 template<class T>
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86 fixpoint<T> fixpoint<T>::power(){
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87 int64_t aux = (int64_t(value)*int64_t(value))>>factor;
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88 return fixpoint<T>(aux);
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89 }
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90
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91 template<class T>
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92 fixpoint<T> fixpoint<T>::sqroot(){
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93 T aux = sqrt(value);
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94 return fixpoint<T>(aux<<(factor/2));
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95 }
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96
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97
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98
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99 typedef fixpoint<int32_t> num32;
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100 typedef fixpoint<int64_t> num64;
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101
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102
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103 class fix1912:public num32{
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104 public:
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105 fix1912():num32(12){};
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106 fix1912(int32_t num):num32(12,num){};
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107 };
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108
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109 class fix0922:public num32{
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110 public:
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111 fix0922():num32(22){};
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112 fix0922(int32_t num):num32(22,num){};
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113 };
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114
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115 class fix4320:public num64{
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116 public:
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117 fix4320():num64(20){};
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118 fix4320(int64_t num):num64(20,num){};
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119 };
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120
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121 #endif /* FIXPOINT_H_ */ No newline at end of file
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1 /*
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2 * fixpoint_test.cpp
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3 *
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4 * Created on: Feb 24, 2015
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5 * Author: aras
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6 */
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7
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8 #include "fixpoint.h"
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9
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10
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11 int main(){
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12
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13 fix1912 A;
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14 fix1912 B;
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15 A.set_from_float(2);
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16 B.set_from_float(5);
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17 fix1912 C;
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18 C=A*B;
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19 C.power();
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20 // N44_20 A1;
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21 // N44_20 B1;
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22 // A1.set_from_float(2);
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23 // B1.set_from_float(5);
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24 //
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25 // N44_20 C1 = (A1*B1).power();
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26
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27 printf("float valout: %f\n",-2.0*500.0);
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28 printf("C valout: %f\n",C.tofloat());
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29 // printf("C1 valout: %f",C1.tofloat());
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30 return 0;
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31 } No newline at end of file
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