1 | #include <iostream>
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2 | #include <boost/multiprecision/cpp_bin_float.hpp>
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3 |
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4 | typedef boost::multiprecision::number<boost::multiprecision::cpp_bin_float<128, boost::multiprecision::backends::digit_base_2> > boost_quadfloat_t;
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5 |
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6 | int main(int , char** )
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7 | {
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8 | char opc = '+';
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9 | for (int op = 0; op < 2; ++op) {
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10 | double a = 0;
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11 | for (int i = 0; i < 2; ++i) {
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12 | double b = 0;
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13 | for (int k = 0; k < 2; ++k) {
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14 | double dab = (opc == '+') ? a + b : a - b;
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15 | boost_quadfloat_t ba = a, bb = b;
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16 | boost_quadfloat_t bab = (opc == '+') ? ba + bb : ba - bb;
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17 |
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18 | std::cout
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19 | << "double: "
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20 | << std::setw(2) << a << " " << opc << " "
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21 | << std::setw(2) << b << " => "
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22 | << std::setw(2) << dab
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23 | << ";\tcpp_bin_float: "
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24 | << std::setw(2) << ba << " " << opc << " "
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25 | << std::setw(2) << bb << " => "
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26 | << std::setw(2) << bab
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27 | << "\n"
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28 | ;
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29 | b = - b;
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30 | }
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31 | a = - a;
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32 | }
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33 | opc = '-';
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34 | }
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35 |
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36 | std::cout << "\n";
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37 | opc = '+';
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38 | for (int op = 0; op < 2; ++op) {
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39 | double a = 1;
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40 | for (int i = 0; i < 2; ++i) {
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41 | double b = (opc == '+') ? -a : a;
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42 | double dab = (opc == '+') ? a + b : a - b;
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43 | boost_quadfloat_t ba = a, bb = b;
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44 | boost_quadfloat_t bab = (opc == '+') ? ba + bb : ba - bb;
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45 |
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46 | std::cout
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47 | << "double: "
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48 | << std::setw(2) << a << " " << opc << " "
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49 | << std::setw(2) << b << " => "
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50 | << std::setw(2) << dab
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51 | << ";\tcpp_bin_float: "
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52 | << std::setw(2) << ba << " " << opc << " "
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53 | << std::setw(2) << bb << " => "
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54 | << std::setw(2) << bab
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55 | << "\n"
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56 | ;
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57 | a = - a;
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58 | }
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59 | opc = '-';
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60 | }
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61 | return 0;
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62 | }
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