APPLYING C++ in .NET framework

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APPLYING C++
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} // Return a token to the input stream template <class PType> void parser<PType>::putback() { char *t; t = token; for(; *t; t++) exp_ptr--; } // Display a syntax error template <class PType> void parser<PType>::serror(int error) { static char *e[]= { "Syntax Error", "Unbalanced Parentheses", "No expression Present" }; cout << e[error] << endl; } // Obtain the next token template <class PType> void parser<PType>::get_token() { register char *temp; tok_type = 0; temp = token; *temp = '\0'; if(!*exp_ptr) return; // at end of expression while(isspace(*exp_ptr)) ++exp_ptr; // skip over white space if(strchr("+-*/%^=()", *exp_ptr)){ tok_type = DELIMITER; // advance to next char *temp++ = *exp_ptr++; } else if(isalpha(*exp_ptr)) { while(!isdelim(*exp_ptr)) *temp++ = *exp_ptr++;
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Parsing Expressions
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tok_type = VARIABLE; } else if(isdigit(*exp_ptr)) { while(!isdelim(*exp_ptr)) *temp++ = *exp_ptr++; tok_type = NUMBER; } *temp = '\0'; } // Return true if c is a delimiter template <class PType> int parser<PType>::isdelim(char c) { if(strchr(" +-/*%^=()", c) || c==9 || c=='\r' || c==0) return 1; return 0; } // Return the value of a variable template <class PType> PType parser<PType>::find_var(char *s) { if(!isalpha(*s)){ serror(1); return (PType) 0; } return vars[toupper(*token)-'A']; }
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As you can see, the type of data now operated upon by the parser is specified by the generic type PType The following main( ) function demonstrates the generic parser
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int main() { char expstr[80]; APPLYING C++ // Demonstrate floating-point parser parser<double> ob; cout << "Floating-point parser "; cout << "Enter a period to stop\n"; for(;;) {
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cout << "Enter expression: "; cingetline(expstr, 79); if(*expstr=='') break; cout << "Answer is: " << obeval_exp(expstr) << "\n\n"; } cout << endl; // Demonstrate integer-based parser parser<int> Iob; cout << "Integer parser "; cout << "Enter a period to stop\n"; for(;;) { cout << "Enter expression: "; cingetline(expstr, 79); if(*expstr=='') break; cout << "Answer is: " << Iobeval_exp(expstr) << "\n\n"; } return 0; }
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Here is a sample run
Floating-point parser Enter a period to stop Enter expression: a=101 Answer is: 101 Enter expression: b=32 Answer is: 32 Enter expression: a/b Answer is: 315625 Enter expression: Integer parser Enter a period to stop Enter expression: a=10 Answer is: 10 Enter expression: b=3
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Parsing Expressions
Answer is: 3 Enter expression: a/b Answer is: 3 Enter expression:
As you can see, the floating-point parser uses floating-point values, and the integer parser uses integer values
Some Things to Try
As mentioned early on in this chapter, only minimal error checking is performed by the parser You might want to add detailed error reporting For example, you could highlight the point in the expression at which an error was detected This would allow the user to find and correct a syntax error As the parser now stands it can evaluate only numeric expressions However, with a few additions, it is possible to enable the parser to evaluate other types of expressions, such as strings, spatial coordinates, or complex numbers For example, to allow the parser to evaluate string objects, you must make the following changes: 1 Define a new token type called STRING 2 Enhance get_token( ) so that it recognizes strings 3 Add a new case inside atom( ) that handles STRING type tokens After implementing these steps, the parser could handle string expressions like these: a = "one" b = "two" c=a+b The result in c should be the concatenation of a and b, or "onetwo" Here is one good application for the parser: create a simple, pop-up mini-calculator that accepts an expression entered by the user and then displays the result This would make an excellent addition to nearly any commercial application If you are programming for Windows, this would be especially easy to do
APPLYING C++
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Appendix A
The NET Managed Extensions to C++
Copyright 2003 by The McGraw-Hill Companies Click here for terms of use
C++: The Complete Reference
icrosoft s NET Framework defines an environment that supports the development and execution of highly-distributed, component-based applications It enables differing computer languages to work together, and provides for security, program portability, and a common programming model for the Windows platform Although the NET Framework is a relatively recent addition to computing, it is an environment in which many C++ programmers will likely be working in the near future Microsoft s NET Framework provides a managed environment that oversees program execution A program targeted for the NET Framework is not compiled into executable object code Rather, it is compiled into Microsoft Intermediate Language (MSIL), which is then executed under the control of the Common Language Runtime (CLR) Managed execution is the mechanism that supports the key advantages offered by the NET Framework To take advantage of NET managed execution, it is necessary for a C++ program to use a set of nonstandard, extended keywords and preprocessor directives that have been defined by Microsoft It is important to understand that these extensions are not defined by ANSI/ISO standard C++ Thus, code in which they are used is nonportable to other environments It is far beyond the scope of this book to describe the NET Framework, or the C++ programming techniques necessary to utilize it (A thorough explanation of the NET Framework and how to create C++ code for it would easily fill a large book!) However, a brief synopsis of the NET managed extensions to C++ is given here for the benefit of those programmers working in the NET environment A basic understanding of the NET Framework is assumed
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