Construction of the sequential file: The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE. There are some steps followed when frame the sequence file from the text file. Frame a uniform format to represent all the information. Encoding all the information on the basis of the format. Write the records one by one sequentially. Frame the uniform format for representing the information: The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below: Field name Number of the characters About the field name Subs_name 10 The name of the subscriber. Address 20 The residential address of the subscriber. Nos_copy 5 The number of the copies subscribed by the customer. Ph_number 10 The ten digits mobile number of the customer. Type 5 The magazine is issued weekly or monthly.

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Answer 1

Question

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

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The next problem concerns the following C code: /copy input string x to buf */ void foo (char *x) { char buf [8]; strcpy((char *) buf, x); } void callfoo() { } foo("ZYXWVUTSRQPONMLKJIHGFEDCBA"); Here is the corresponding machine code on a Linux/x86 machine: 0000000000400530 : 400530: 48 83 ec 18 sub $0x18,%rsp 400534: 48 89 fe mov %rdi, %rsi 400537: 48 89 e7 mov %rsp,%rdi 40053a: e8 d1 fe ff ff 40053f: 48 83 c4 18 add callq 400410 $0x18,%rsp 400543: c3 retq 0000000000400544 : 400544: 48 83 ec 08 sub $0x8,%rsp 400548: bf 00 06 40 00 mov $0x400600,%edi 40054d: e8 de ff ff ff callq 400530 400552: 48 83 c4 08 add $0x8,%rsp 400556: c3 This problem tests your understanding of the program stack. Here are some notes to help you work the problem: • strcpy(char *dst, char *src) copies the string at address src (including the terminating '\0' character) to address dst. It does not check the size of the destination buffer. You will need to know the hex values of the following characters:

A ROP (Return-Oriented Programming) attack can be used to execute arbitrary instructions by chaining together small pieces of code called "gadgets." Your goal is to create a stack layout for a ROP attack that calls a function located at '0x4018bd3'. Below is the assembly code for the function 'getbuf', which allocates 8 bytes of stack space for a 'char' array. This array is then passed to the 'gets' function. Additionally, you are provided with five useful gadgets and their addresses. Use these gadgets to construct the stack layout. Assembly for getbuf 1 getbuf: 2 sub $8, %rsp 3 mov %rsp, %rdi 4 call gets 56 add $8, %rsp ret #Allocate 8 bytes for buffer #Load buffer address into %rdi #Call gets with buffer #Restore the stack pointer #Return to caller. Stack Layout (fill in Gadgets each 8-byte section) Address Gadget Address Value (8 bytes) 0x4006a7 pop %rdi; ret 0x7fffffffdfc0 Ox4006a9 pop %rsi; ret 0x7fffffffdfb8 0x4006ab pop %rax; ret 0x7fffffffdfb0 0x7fffffffdfa8 Ox4006ad mov %rax,…

In each of the following C code snippets, there are issues that can prevent the compilerfrom applying certain optimizations. For each snippet:• Circle the line number that contains compiler optimization blocker.• Select the best modification to improve optimization.1. Which line prevents compiler optimization? Circle one: 2 3 4 5 6Suggested solution:• Remove printf or move it outside the loop.• Remove the loop.• Replace arr[i] with a constant value.1 int sum( int ∗ ar r , int n) {2 int s = 0 ;3 for ( int i = 0 ; i < n ; i++) {4 s += a r r [ i ] ;5 p r i n t f ( ”%d\n” , s ) ;6 }7 return s ;8 }2. Which line prevents compiler optimization? Circle one: 2 3 4 5 6Suggested solution:• Move or eliminate do extra work() if it’s not necessary inside the loop.• Remove the loop (but what about scaling?).• Replace arr[i] *= factor; with arr[i] = 0; (why would that help?).1 void s c a l e ( int ∗ ar r , int n , int f a c t o r ) {2 for ( int i = 0 ; i < n ; i++) {3 a r r [ i ] ∗= f a c t o r…

Answer 2

Question

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

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Answer 3

Question

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

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Answer 4

Question

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

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Answer 5

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

Answer 6

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

Answer 7

Chapter 9, Problem 53CRP

Program Plan Intro

Construction of the sequential file:

The text files serve as construction of the sequential files in which each logical records is the symbol encoded using ASCII or UNICODE.

There are some steps followed when frame the sequence file from the text file.

Frame a uniform format to represent all the information.

Encoding all the information on the basis of the format.

Write the records one by one sequentially.

Frame the uniform format for representing the information:

The records must be of standard size 50 characters and it is related with 4 fields. The information required in each field and their maximum required character is given below:

Field name Number of the characters About the field name
Subs_name 10 The name of the subscriber.
Address 20 The residential address of the subscriber.
Nos_copy 5 The number of the copies subscribed by the customer.
Ph_number 10 The ten digits mobile number of the customer.
Type 5 The magazine is issued weekly or monthly.

Answer 8

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Answer 11

Ch. 9.1 - Identify two departments in a manufacturing plant...Ch. 9.1 - Prob. 2QE Ch. 9.1 - Summarize the roles of the application software...Ch. 9.2 - Prob. 1QE Ch. 9.2 - Prob. 2QE Ch. 9.2 - Prob. 4QE Ch. 9.2 - Prob. 5QE Ch. 9.2 - Prob. 6QE Ch. 9.3 - Prob. 1QE Ch. 9.3 - What is a persistent object?

Solution Summary: The author explains that the files serve as construction of the sequential files in which each logical record is the symbol encoded using ASCII or UNICODE.

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Chapter 9 Solutions

Field name	Number of the characters	About the field name
Subs_name	10	The name of the subscriber.
Address	20	The residential address of the subscriber.
Nos_copy	5	The number of the copies subscribed by the customer.
Ph_number	10	The ten digits mobile number of the customer.
Type	5	The magazine is issued weekly or monthly.