Explain piping.

965

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What do you understand by a cartesian join?

1165

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What are indexes and mention different types of indexes?

559

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what is the syntax for using sql_variant_property? : Transact sql

1086

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how to do the batch testing in test director using manual testing procedure?

2435

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Explain this pointer?

1114

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What is a set? What pointers are required, what are possible? How may sets be ordered?

1427

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What is the significance of scope resolution operator?

1459

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Give steps to connect to the db using jdbc?

1066

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what is over ball dimmention? why it is required? what is used in machining?

2486

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Explain about block scope in c?

1149

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Why doesn't the following code print the newline properly?

174

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Which task lists are object based?

951

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The following program reads data (details of students) from a file named students.txt and converts it into e-mail addresses. The results are written to a file named studentemail.txt. students.txt consists of a number of lines, each containing the data of a student in colon delimited format: Last Name:First Name:Student Number Each input record is converted to an e-mail address and written to studentemail.txt in the following format: the first character of the last name + the first character of the first name + the last four digits of the student number + “@myunisa.ac.za” import java.io.*; public class EmailConverter { public static void main(String[] args) throws IOException { BufferedReader input = new BufferedReader(new FileReader ("students.txt")); PrintWriter output = new PrintWriter(new FileWriter ("studentemail.txt")); String line = input.readLine(); while (line != null) { // Extract the information for each student String[] items = line.split(":"); // Generate the email address String email = "" + items[0].charAt(0) + items[1].charAt(0) + items[2].substring(4,8) + "@myunisa.ac.za"; email = email.toLowerCase(); // Output output.println(email); line = input.readLine(); } input.close(); output.close(); } } Rewrite the class so that it handles possible errors that may occur. In particular, it should do the following: • It should catch at least three appropriate exceptions that might occur, and display suitable messages. • At this stage, the program will not run correctly if there is an empty line in the input file. Change the program so that if an empty line is encountered, an exception is thrown and the empty line is ignored. This exception should be handled with the display of a suitable error message. • Before the e-mail address is added to the output file, check if the student number has 8 digits. If not, throw an InvalidFormatException (which the program should not handle itself)

1998

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What is a cspack ?

611

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