c109s05t2 - CSE 109 Test 2 Wednesday 13 April 2005...

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CSE 109 Test 2 Wednesday 13 April 2005 >>>>>>>>>>>>>>>>>>>>>>>>>>SUGGESTED ANSWERS<<<<<<<<<<<<<<<<<<<<<<<<<<<< 1. Assume that in developing the class Word from class, I have progressed to the point of having the declaration below. Continue the development by providing the declaration and definition (code) for the concatenation operator, '+'. The behavior is indicated by the code below the declaration. class Word {public: Word(char *x=""); friend ostream & operator<<(ostream &out,const Word & t); private: static void check(bool b, char *mess); char *str; }; } //sample code, output indicated after second line Word a("Hello"),b(" there"); cout<<(a+b+".")<<(" I see you"+b)<<endl; //Hello there. I see you there >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> friend Word operator+(const Word &a, const Word &b); f Word operator+(const Word &a, const Word &b) {char *temp; temp=new char[strlen(a.str)+strlen(b.str)+1]; check(temp!=NULL,"(+) Heap overflow"); strcpy(temp,a.str); strcat(temp,b.str); Word t(temp); delete[]temp; return t; } <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 2. Assume class Lex from program p4. Write a program that reads one line of text from the file "ff" and determines whether the syntax of the line
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