Description: This program can parse a complete class PASCAL program and output the results of the analysis.
The program requires that the input string must have a complete program body description and the flag that the program starts, otherwise the parser will give an error message.
After the above judgment when, for each statement list of analysis, including the assignment statement, branch statement and circular statement (nested), and the judgment results show that if there are any errors, the output error type and line number.
Output in the form of: the parser is given at the end of a sentence analysis a type information such as: if 1 then j: = j + 1 for the judgment of the information: "assignment" and "if then branch statements".
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