Design Common Syntax Errors are several types of error, with consequences ranging from deficiencies in the formatting of the output to the calculation of wrong results. A compilation error (which prevents the compiler from compiling the source code) is usually a syntax error but could be an error in the compiler itself. A syntax error results when the source code does not obey the rules of the language. The compiler generates error messages to help the programmer to fix the code. The source code may compile to machine code which then fails upon execution. A run-time error causes this situation. Potentially the most serious type of error occurs when the program appears to be working but is performing faulty processing due to logic errors in the source code. I classify the common errors as syntax errors. I designed some of errors which the DCSPM compiler recognizes so, every token has ascii code such as , on. The token code in the symbol table represents its keyword such as: ‘(‘ ‘)’, …..so keyword has 323, keyword has 305, so on. The method in DCSPM compiler ‘program’ ‘do’ … looks like: static void t) { if (lookahead.code == t) { lookahead = nextToken(); } else switch (t) { case 40: Err += "\n" + "\n" + "Expected Missing '('"; break; case 41: Err += "\n" + "\n" + "Expected Missing ')'"; break; case 44: Err += "\n" + "\n" + "Expected Missing ','";
Design Common Syntax Errors are several types of error, with consequences ranging from deficiencies in the formatting of the output to the calculation of wrong results. A compilation error (which prevents the compiler from compiling the source code) is usually a syntax error but could be an error in the compiler itself. A syntax error results when the source code does not obey the rules of the language. The compiler generates error messages to help the programmer to fix the code. The source code may compile to machine code which then fails upon execution. A run-time error causes this situation. Potentially the most serious type of error occurs when the program appears to be working but is performing faulty processing due to logic errors in the source code. I classify the common errors as syntax errors. I designed some of errors which the DCSPM compiler recognizes so, every token has ascii code such as ‘(‘ , ‘)’, …..so on. The token code in the symbol table represents its keyword such as: ‘program’ keyword has 323, ‘do’ keyword has 305, … so on. The method in DCSPM compiler looks like: static void t) { if (lookahead.code == t) { lookahead = nextToken(); } else switch (t) { case 40: Err += "\n" + "\n" + "Expected Missing '('"; break; case 41: Err += "\n" + "\n" + "Expected Missing ')'"; break; case 44: Err += "\n" + "\n" + "Expected Missing ','";
DCSPMCompilerV8a.docx