This is solution to an assignment question . its written in C++.
To compile:
g++ -std=c++11 tokenizer.cpp -o t
./t input
The assignment question is as follows:
Write a C/C++ program that implements a simple scanner for a source file given as a command-line argument. The format of the tokens is described below. You may assume that the input is syntactically correct. Your program should build a symbol table (a hash table is a good choice), which contains an entry for each token that was found in the input. When all the input has been read, your program should produce a summary report that includes a list of all the tokens that appeared in the input, the number of times each token appears in the input and the class of each token. Your program should also list how many times tokens of each class appeared in the input.
The token format:
keyword -> if | then | else | begin | end
identifier -> character | character identifier
integer -> digit | digit integer
real -> integer.integer
special -> ( | ) | [ | ] | + | - | = | , | ;
digit -> 0|1|2|3|4|5|6|7|8|9
character -> a|b|c ... |z|A|B|C ... |Z
More details:
• Case is not used to distinguish keywords or identifiers.
• The delimiters are space, tab, newline, and the special characters.
• The token classes that should be recognized are keyword, identifier, integer, real and special.
• Your final program must compile and run using a C++ compiler (your choice).