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  1. #include<iostream>
  2. #include<bitset>
  3. #include<cmath>
  4. #include<climits>
  5.  
  6. using namespace std;
  7. class Number
  8. {
  9.     bool sign_;
  10.     int exponent_;
  11.     float mantissa_;
  12.  
  13.     public:
  14.     Number (char,int,float);
  15.     Number (float);
  16.     void ConvertFromFloat(const float&);
  17.     float ConvertFromNumber() const;
  18.     Number operator+=(const Number& toAdd) const
  19.     {
  20.         return Number(ConvertFromNumber()+toAdd.ConvertFromNumber());
  21.     }
  22.     Number operator-=(const Number& toAdd)
  23.     {
  24.         return Number(ConvertFromNumber()-toAdd.ConvertFromNumber());
  25.     }
  26.     friend ostream &operator<<(ostream &os,const Number &toShow);
  27. };
  28.  
  29.  
  30. Number operator+(const Number &toAdd1,const Number &toAdd2)
  31. {
  32.     return Number(toAdd1.ConvertFromNumber()+toAdd2.ConvertFromNumber());
  33. }
  34.  
  35. Number operator-(const Number &toAdd1,const Number &toAdd2)
  36. {
  37.     return Number(toAdd1.ConvertFromNumber()-toAdd2.ConvertFromNumber());
  38. }
  39.  
  40. ostream &operator<<(ostream &os,const Number &toShow)
  41. {
  42.     os << toShow.ConvertFromNumber();
  43.     return os;
  44. }
  45.  
  46.  
  47. float Number::ConvertFromNumber() const
  48. {
  49.     int negative=1;
  50.     if (sign_==false)
  51.     {
  52.         negative=0;
  53.     }
  54.  
  55.     return pow(-1,negative)*pow(2,exponent_-127)*mantissa_;
  56. }
  57.  
  58. void Number::ConvertFromFloat(const float& ieee)
  59. {
  60.     union
  61.     {
  62.         float input;
  63.         int output;
  64.     } data;
  65.     data.input=ieee;
  66.  
  67.     std::bitset<sizeof(float) * CHAR_BIT> number(data.output);
  68.     for (int i=0;i<32;i++)
  69.     {
  70.         if (i==0)
  71.         {
  72.             if (number[31-i]==1)
  73.             {
  74.                 sign_=true;
  75.             }
  76.         }
  77.         else if (i>0 && i<9)
  78.         {
  79.             if (number[31-i]==1)
  80.             {
  81.                 exponent_+=pow(2,8-i);
  82.             }
  83.         }
  84.         else
  85.         {
  86.             if (number[31-i]==1)
  87.             {
  88.                 mantissa_+=pow(2,8-i);
  89.             }
  90.         }
  91.     }
  92. }
  93.  
  94. Number::Number (char sign,int exponent,float mantissa)
  95. : sign_(sign), exponent_(exponent), mantissa_(mantissa)
  96. {
  97.     if (sign=='-')
  98.     {
  99.         sign_=true;
  100.     }
  101.     if (sign=='+')
  102.     {
  103.         sign_=false;
  104.     }
  105. }
  106.  
  107. Number::Number (float ieee)
  108. : mantissa_(1), exponent_(0)
  109. {
  110.     ConvertFromFloat(ieee);
  111. }
  112.  
  113.  
  114.  
  115.  
  116. using namespace std;
  117.  
  118. int main()
  119. {
  120.     char sign;
  121.     int exponent;
  122.     float mantissa;
  123.     cin >> sign >> exponent >> mantissa;
  124.     Number num1(sign,exponent,mantissa);
  125.     cin >> sign >> exponent >> mantissa;
  126.     Number num2(sign,exponent,mantissa);
  127.     num1 += num2;
  128. }
  129.  
Success #stdin #stdout 0s 4400KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/8W968p
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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