Question

The scanner takes the name of a text file from the command line. It outputs to the console error if there is any non-valid token in the input file; the list of tokens otherwise. Your implementation should be based on the automata in on Page 56 of the textbook. Commandline Invocation: scanner <input file name> If there is any non-token string in the input file, your program should exit and output to the console only: error. Otherwise, your program outputs only the list of tokens in the form of (tokeni, token2, ...). Example Input File: foo.txt with the following content: read /* foo bar */ five 5 Example Commandline: scanner foo.txt Example Output: (read, times, id, number). Note that your scanner does NOT output the token of comment. In fact, your function scan should completely ignore all comments in the input. In the example, the next token of times is id, instead of comment.

Would you please do Pseudocode for this progarm in Java??

Using scanner algorithm, The scanner takes the name of a text file from the command line and prints out the list of tokens. If there is non-valid token in the input file, print out “error”.

please help me to write Pseudocode!

thank you!!

Answer 1

Hi dear,

Here I am providing you both pseudo code and sample program

1. Pass text. txt file as an command line argument while running java jar file.

2.Declare scanner class object inside the main method block, and get argument string from the formal parameter of main method.

3.Finally, pass that string in scanner class object that indicates specified path to read content from the file.

4. Take while loop and check condition input file have next token or not. If have new token to read then store that word in string array.

5.close the scanner class object.

Sample program.

class ScannerAlgorithm{

public static void main (String args[]) {

Scanner scanner=new Scanner (args[0]) ;

String []tokens;

int i=0;

While(scanner.hasNextline()) {

System. out. println (scanner.next()) ;

tokens [i++]=scanner.next() ;

}

scanner. close () ;}

}