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POdeclaring class variable c++
 

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    <p>So I'm at a complete loss...</p> <p>In my code I've got</p> <pre><code>void Parser(FILE* file) { Parser par(file); par.Parse(); } </code></pre> <p>and I call it in my main function with <code>Parser(file);</code> and the header file I've got (which I included in the main file) looks like:</p> <pre><code>class Parser: public Lexer { public: Parser(FILE* file):Lexer(file); int Parse(); }; </code></pre> <p>and the error I'm getting is:</p> <pre><code>p02.cpp: In function 'void Parser(FILE*)': p02.cpp:20: error: expected ';' before 'par' p02.cpp:21: error: 'par' was not declared in this scope make: *** [p02.o] Error 1 </code></pre> <p>What I don't understand is why it is expecting a semicolon before par. Isn't that a legal declaration of a variable for that class?</p> <p>Edit2: Changing my function name to not be Parser like the class name does not solve this problem. It does give me an <em>extra</em> error telling me that Parser is not declared in this scope, but I cannot see how that is when I've added the include file containing the Parser class right above the declaration for the function.</p> <p>Edit: My Files p02.cpp:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;iostream&gt; #include &lt;cstring&gt; #include &lt;string&gt; #include "p02lex.h" #include "y.tab.h" using namespace std; void Parser(FILE* file) { Parser par(file); par.Parse(); } int main(int argc, char* argv[]) { char fileName[255]; switch(argc) { case 1: cout &lt;&lt; "Enter the input file name. "; cin &gt;&gt; fileName; break; case 2: strcpy(fileName, argv[1]); break; default: cout &lt;&lt; "Too many arguments!\n"; exit(1); } FILE* file = fopen(fileName, "r"); Parser(file); fclose(file); return 0; } </code></pre> <p>p02lex.l:</p> <pre><code>#include "p02lex.h" #define ID 257 ... #define PROGRAM 304 int TokenMgr(int t); const char* getTokens(int tokenCode); unsigned lineCount = 1, columnCount = 1; %} LETTER [a-z]|[A-Z] DIGIT [0-9] %% // rules defined here, calling TokenMgr() %% int TokenMgr(int t) { /* int tc = t; if (t == IDENTIFIER) { char s[1024]; ToLower(s, yytext, strlen(yytext)); tc = RW[s]; if (tc == 0) tc = t; } PrintToken(tfs, tc, line, col); col += yyleng; */ //JEG printf("Token:Code=%d Name=%10s line=%3u col=%3u Spelling=\"%s\"\n", t, getTokens(t), lineCount, columnCount, yytext); columnCount += yyleng; return /* tc */ 0; // JEG } Lexer::Lexer(FILE* file) { yyin = file; } int Lexer::Scan(void) { return yylex(); } const char* getTokens(int tokenCode) { switch(tokenCode) { case ID: return "ID"; ... // more cases, returning strings default: return NULL; } } </code></pre> <p>p02lex.h:</p> <pre><code>#ifndef p02lex_h #define p02lex_h 1 #endif int yylex(void); class Lexer { public: Lexer(FILE* file); int Scan(void); }; </code></pre> <p>p02par.h:</p> <pre><code>#ifndef p02par_h #define p02par_h 1 #endif using namespace std; #ifdef __cplusplus extern "C" #endif int yyparse(void); class Parser: public Lexer { public: Parser(FILE* file):Lexer(file){} void Parse(); // int Scan(void); }; </code></pre> <p>p02par.y:</p> <pre><code>#include &lt;stdio.h&gt; #include "p02lex.h" #include "p02par.h" void yyerror(const char* m); %} %token PROGRAM %token ID %token SEMICOLON %% program: PROGRAM ID SEMICOLON { printf("Stuff happens!\n"); } %% void yyerror(const char* m) { printf("%s\n", m); } /*Parser::Parser(FILE* file):Lexer(file) { }*/ int Parser::Parse() { return yyparse(); } </code></pre> <p>p02make:</p> <pre><code>#LEX = flex #YACC = yacc -d CC = g++ OBJ = p02.o p02par.o p02lex.o p02: ${OBJ} $(CC) -o p02 ${OBJ} -ll -ly y.tab.h p02par.cpp: p02par.y yacc -d -v p02par.y mv y.tab.c p02par.cpp p02lex.cpp: p02lex.l lex p02lex.l mv lex.yy.c p02lex.cpp p02par.o: p02par.cpp p02par.h $(CC) -c -g p02par.cpp p02.o: p02.cpp p02lex.h p02par.h $(CC) -c -g p02.cpp p02lex.o: p02lex.cpp p02lex.h y.tab.h $(CC) -c -g p02lex.cpp </code></pre>
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    1. CODon't give functions and classes the same identifier, it will only confuse you.
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