解释器(Interpreter)之大胆向MM示爱吧(四)
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1 #include
2 #include "expression.h"
3 #include "Translator.h"
4
5 using namespace std;
6
7 int main()
8 {
9 cout << "Input your command below: " << endl;
10 string str;
11 getline(cin, str);
12 Translator translator;
13
14 // ... Generate the Abstract Grammar Tree by Translator
15 Expression* myExp = translator.translate(str);
16 if (!myExp) return 1;
17
18 // ... Call Its Interpret Operation
19 stringstream ss;
20 myExp->eva l(ss);
21
22 cout << ss.str() << endl;
23 return 0;
24 }
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那么我们输入之前第二串字符试试：
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