| 93 | } |
| 94 | |
| 95 | void MathExp::doNextOperation() |
| 96 | { |
| 97 | //pop operator off and apply it, then push the value onto the operand stack |
| 98 | const char top = mOperators.top(); |
| 99 | float val = 0; |
| 100 | |
| 101 | if(top == *"+") |
| 102 | { |
| 103 | val = mOperands.top(); |
| 104 | mOperands.pop(); |
| 105 | val += mOperands.top(); |
| 106 | mOperands.pop(); |
| 107 | } |
| 108 | if(top == *"-") |
| 109 | { |
| 110 | val = mOperands.top(); |
| 111 | mOperands.pop(); |
| 112 | val = mOperands.top() - val; |
| 113 | mOperands.pop(); |
| 114 | } |
| 115 | if(top == *"*") |
| 116 | { |
| 117 | val = mOperands.top(); |
| 118 | mOperands.pop(); |
| 119 | val *= mOperands.top(); |
| 120 | mOperands.pop(); |
| 121 | } |
| 122 | if(top == *"/") |
| 123 | { |
| 124 | val = mOperands.top(); |
| 125 | mOperands.pop(); |
| 126 | val = mOperands.top() / val; |
| 127 | mOperands.pop(); |
| 128 | } |
| 129 | |
| 130 | mOperands.push(val); |
| 131 | |
| 132 | mOperators.pop(); |
| 133 | } |
| 134 | |
| 135 | void MathExp::setExpression(std::string str) |
| 136 | { |