PAC MindLink MindTap Enh Discovering Computers & Microsoft Office 2013: Fundamental
13th Edition
ISBN: 9781305492394
Author: Cenage Learning
Publisher: Cengage Learning
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Chapter 9, Problem 32SG
Program Plan Intro
- The most important program that runs on a computer is operating system.
- OS is the term that acts as an interface between the hardware and the user.
- OS does basic operations such as getting input from the keyboard, displaying output in the monitor and monitoring the files.
- OS controls the peripheral devices like printers, hard drives and mouse.
- It is responsible for the management to co-ordinate the activities on a computer system.
- The responsibilities of OS are bound to get higher when it comes to security, because it provides the access rights for users.
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How to develop a C program that receives the message sent by the provided program and displays the name and email included in the message on the screen?Here is the code of the program that sends the message for reference:
typedef struct { long tipo; struct { char nome[50]; char email[40]; } dados;} MsgStruct;
int main() { int msg_id, status; msg_id = msgget(1000, 0600 | IPC_CREAT); exit_on_error(msg_id, "Creation/Connection"); MsgStruct msg; msg.tipo = 5; strcpy(msg.dados.nome, "Pedro Silva"); strcpy(msg.dados.email, "pedro@sapo.pt"); status = msgsnd(msg_id, &msg, sizeof(msg.dados), 0); exit_on_error(status, "Send"); printf("Message sent!\n");}
9. Let L₁=L(ab*aa), L₂=L(a*bba*). Find a regular expression for (L₁ UL2)*L2.
10. Show that the language
is not regular.
L= {a":n≥1}
11. Show a derivation tree for the string aabbbb with the grammar
S→ABλ,
A→aB,
B→Sb.
Give a verbal description of the language generated by this grammar.
14. Show that the language
L= {wna (w) < Nь (w) < Nc (w)}
is not context free.
Chapter 9 Solutions
PAC MindLink MindTap Enh Discovering Computers & Microsoft Office 2013: Fundamental
Ch. 9 - Prob. 1SGCh. 9 - Prob. 2SGCh. 9 - Prob. 3SGCh. 9 - Prob. 4SGCh. 9 - Prob. 5SGCh. 9 - Prob. 6SGCh. 9 - Prob. 7SGCh. 9 - Prob. 8SGCh. 9 - Prob. 9SGCh. 9 - Prob. 10SG
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