Program Plan: Include necessary header files. Start “main()” function. Declare two arrays to get input. Use getline() function to get input in array “ a ”, with delimiter being ‘c’. Use peek function to display next character in the input stream. Use get() function to get input in array “ b ”, with delimiter being ‘c’. Use peek function to display next character in the input stream. Display both the strings entered. Use strlen() function to calculate the length of input, add one to it and check if it is a null character. It will tell that if the string ends with null character or not. Return an exit the program.

Question

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a) Give an example of when an application might want to receive such ICMP messages. (b) Find out what an application has to do, on the operating system of your choice, to receive such messages. (c) Why might it not be a good idea to send such messages directly back to the originating port P on A?

Answer 1

Question

Chapter 13, Problem 13.18E

Program Plan Intro

Program Plan:

Include necessary header files.

Start “main()” function.

Declare two arrays to get input.

Use getline() function to get input in array “ a ”, with delimiter being ‘c’.

Use peek function to display next character in the input stream.

Use get() function to get input in array “ b ”, with delimiter being ‘c’.

Use peek function to display next character in the input stream.

Display both the strings entered.

Use strlen() function to calculate the length of input, add one to it and check if it is a null character. It will tell that if the string ends with null character or not.

Return an exit the program.

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