1 | // GenerateMathProblem01.cpp : Defines the entry point for the console application. |
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2 | // |
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3 | |
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4 | #include "stdafx.h" |
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5 | |
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6 | class Item |
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7 | { |
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8 | public: |
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9 | // Item |
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10 | virtual INT GetPriority() |
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11 | { |
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12 | return 0; |
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13 | } |
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14 | virtual BOOL IsCommutative() |
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15 | { |
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16 | return TRUE; |
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17 | } |
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18 | virtual CString AsString() = 0; |
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19 | virtual BOOL IsOperation() |
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20 | { |
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21 | return FALSE; |
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22 | } |
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23 | }; |
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24 | |
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25 | class ValueItem : |
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26 | public Item |
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27 | { |
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28 | private: |
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29 | INT m_nValue; |
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30 | |
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31 | public: |
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32 | // ValueItem |
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33 | ValueItem(INT nValue = 0) : |
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34 | m_nValue(nValue) |
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35 | { |
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36 | } |
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37 | INT GetValue() const |
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38 | { |
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39 | return m_nValue; |
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40 | } |
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41 | CString AsString() |
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42 | { |
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43 | CString sString; |
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44 | sString.Format(_T("%d"), m_nValue); |
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45 | return sString; |
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46 | } |
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47 | }; |
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48 | |
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49 | class OperationItem : |
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50 | public Item |
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51 | { |
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52 | public: |
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53 | Item* m_pItem1; |
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54 | CHAR m_nSymbol; |
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55 | Item* m_pItem2; |
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56 | |
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57 | public: |
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58 | // OperationItem |
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59 | OperationItem() : |
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60 | m_pItem1(NULL), |
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61 | m_pItem2(NULL) |
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62 | { |
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63 | } |
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64 | INT GetPriority() |
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65 | { |
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66 | switch(m_nSymbol) |
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67 | { |
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68 | case '+': |
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69 | case '-': |
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70 | return 2; |
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71 | case '*': |
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72 | case '/': |
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73 | return 1; |
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74 | } |
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75 | return 0; |
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76 | } |
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77 | BOOL IsCommutative() |
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78 | { |
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79 | switch(m_nSymbol) |
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80 | { |
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81 | case '-': |
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82 | case '/': |
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83 | return FALSE; |
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84 | } |
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85 | return __super::IsCommutative(); |
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86 | } |
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87 | CString AsString() |
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88 | { |
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89 | CString sString; |
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90 | if(m_pItem1->GetPriority() > GetPriority()) |
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91 | sString.AppendFormat(_T("(%s)"), m_pItem1->AsString()); |
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92 | else |
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93 | sString.Append(m_pItem1->AsString()); |
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94 | sString.AppendFormat(_T(" %c "), m_nSymbol); |
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95 | if(m_pItem2->GetPriority() > GetPriority() || m_pItem2->IsOperation() && m_pItem2->GetPriority() == GetPriority() && !IsCommutative()) |
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96 | sString.AppendFormat(_T("(%s)"), m_pItem2->AsString()); |
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97 | else |
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98 | sString.Append(m_pItem2->AsString()); |
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99 | return sString; |
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100 | } |
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101 | BOOL IsOperation() |
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102 | { |
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103 | return TRUE; |
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104 | } |
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105 | }; |
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106 | |
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107 | VOID Generate() |
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108 | { |
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109 | const INT nResult = 5 + rand() % 95; // Result would be 5..99 |
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110 | Item* pItem = new ValueItem(nResult); |
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111 | #if defined(_DEBUG) |
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112 | for(INT nCount = 3; nCount > 0; ) |
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113 | #else |
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114 | for(INT nCount = 7 + rand() % 7; nCount > 0; ) |
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115 | #endif // defined(_DEBUG) |
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116 | { |
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117 | Item** ppBrokenItem = &pItem; |
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118 | while((*ppBrokenItem)->IsOperation()) |
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119 | { |
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120 | OperationItem* pBrokenOperationItem = static_cast<OperationItem*>(*ppBrokenItem); |
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121 | ppBrokenItem = &((rand() % 2) ? pBrokenOperationItem->m_pItem1 : pBrokenOperationItem->m_pItem2); |
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122 | } |
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123 | ValueItem* pBrokenValueItem = static_cast<ValueItem*>(*ppBrokenItem); |
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124 | OperationItem* pNewOperationItem = new OperationItem; |
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125 | static const INT g_nAddWeight = 15; |
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126 | static const INT g_nSubtractWeight = 10; |
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127 | static const INT g_nMultiplyWeight = 70; |
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128 | static const INT g_nDivideWeight = 5; |
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129 | INT nOperation = rand() % (g_nAddWeight + g_nSubtractWeight + g_nMultiplyWeight + g_nDivideWeight); |
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130 | for(; ; ) |
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131 | { |
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132 | #pragma region Add |
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133 | nOperation -= g_nAddWeight; |
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134 | if(nOperation < 0) |
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135 | { |
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136 | const INT nAddend = 5 + rand() % 95; // Result would be 5..99 |
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137 | if(pBrokenValueItem->GetValue() - nAddend < 0) |
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138 | { |
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139 | pNewOperationItem = NULL; |
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140 | break; // New Value Item is Negative |
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141 | } |
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142 | if(rand() % 2) |
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143 | { |
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144 | pNewOperationItem->m_pItem1 = new ValueItem(pBrokenValueItem->GetValue() - nAddend); |
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145 | pNewOperationItem->m_pItem2 = new ValueItem(nAddend); |
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146 | } else |
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147 | { |
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148 | pNewOperationItem->m_pItem1 = new ValueItem(nAddend); |
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149 | pNewOperationItem->m_pItem2 = new ValueItem(pBrokenValueItem->GetValue() - nAddend); |
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150 | } |
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151 | pNewOperationItem->m_nSymbol = '+'; |
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152 | break; |
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153 | } |
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154 | #pragma endregion |
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155 | #pragma region Subtract |
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156 | nOperation -= g_nSubtractWeight; |
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157 | if(nOperation < 0) |
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158 | { |
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159 | const INT nSubtrahend = 5 + rand() % 95; // Result would be 5..99 |
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160 | pNewOperationItem->m_pItem1 = new ValueItem(pBrokenValueItem->GetValue() + nSubtrahend); |
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161 | pNewOperationItem->m_nSymbol = '-'; |
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162 | pNewOperationItem->m_pItem2 = new ValueItem(nSubtrahend); |
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163 | break; |
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164 | } |
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165 | #pragma endregion |
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166 | #pragma region Multiply |
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167 | nOperation -= g_nMultiplyWeight; |
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168 | if(nOperation < 0) |
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169 | { |
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170 | const INT nFactor = 5 + rand() % 95; // Result would be 5..99 |
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171 | if(pBrokenValueItem->GetValue() % nFactor) |
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172 | { |
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173 | pNewOperationItem = NULL; |
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174 | break; // There is a Remainder |
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175 | } |
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176 | if(rand() % 2) |
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177 | { |
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178 | pNewOperationItem->m_pItem1 = new ValueItem(pBrokenValueItem->GetValue() / nFactor); |
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179 | pNewOperationItem->m_pItem2 = new ValueItem(nFactor); |
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180 | } else |
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181 | { |
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182 | pNewOperationItem->m_pItem1 = new ValueItem(nFactor); |
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183 | pNewOperationItem->m_pItem2 = new ValueItem(pBrokenValueItem->GetValue() / nFactor); |
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184 | } |
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185 | pNewOperationItem->m_nSymbol = '*'; |
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186 | break; |
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187 | } |
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188 | #pragma endregion |
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189 | #pragma region Divide |
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190 | //nOperation -= g_nDivideWeight; |
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191 | //if(nOperation < 0) |
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192 | { |
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193 | const INT nDivisor = 5 + rand() % 95; // Result would be 5..99 |
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194 | pNewOperationItem->m_pItem1 = new ValueItem(pBrokenValueItem->GetValue() * nDivisor); |
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195 | pNewOperationItem->m_nSymbol = ':'; |
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196 | pNewOperationItem->m_pItem2 = new ValueItem(nDivisor); |
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197 | break; |
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198 | } |
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199 | #pragma endregion |
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200 | } |
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201 | if(!pNewOperationItem) |
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202 | continue; |
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203 | *ppBrokenItem = pNewOperationItem; |
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204 | nCount--; |
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205 | } |
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206 | _tprintf(_T("%s = %d\n"), pItem->AsString(), nResult); |
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207 | } |
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208 | |
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209 | int _tmain(int argc, _TCHAR* argv[]) |
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210 | { |
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211 | srand(1); |
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212 | for(INT nCount = 0; nCount < 1000; nCount++) |
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213 | { |
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214 | #if defined(_DEBUG) |
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215 | _tprintf(_T("%d: "), nCount); |
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216 | #endif // defined(_DEBUG) |
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217 | Generate(); |
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218 | if(nCount % 10 == 9) |
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219 | _tprintf(_T("\n")); |
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220 | } |
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221 | // NOTE: Who cares about memory leaks, right? |
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222 | return 0; |
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223 | } |
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224 | |
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