ssrs qr code Review Questions 12.1 in Software

Encoding Quick Response Code in Software Review Questions 12.1

Review Questions 12.1
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Why is the default constructor for the ios class declared private Why aren t the width, f i 11, and precision parameters of a stream packed into a bit string the way all the other parameters are If a stream s - format data member is o 4 o 3 5, what format flags are set If a stream s - format data member is o 4 7 62 3, what format flags are set Why is the ios class made to be a virtual base class for the istream and ostream classes
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12.3 12.4 12.5
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CHAP. 121
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STREAM I/O
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Why is the use of the CC and >> operators called formatted I/O, and the use of the functions put ( ) , get ( ) , wri t e ( ) , read ( ) , etc., call unformatted I/O What is the difference between the get ( ) function and the get line ( ) function What is the difference between the get ( > function and the read ( > function
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Solved Problems
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What should the function prototype for the
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( ) manipulator look like
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Every stream manipulator should have the general prototype ios& f(ios&); where i OS is the stream class that f manipulates. Since the ws manipulator is used with i s t reams its prototype should be istream& ws(istream&); 12.10 Write code that formats tout so that integers are printed in octal in a right-justified field of
12 columns.
cout.setf( ios::oct I ios::ios ); cout.width(l2);
Solved Programming Problems
12.11 Write a program that uses the set f ( ) , f i 11( ) , and width ( > functions to produce the following formatted output:
10 11 12 A String Class.................................22 Inheritance....................................24 Streams........................................27 2 4 3
The idea here is to use left-justify the titles in a field width of 60 columns, with I . I as the fill character padding the field on the right, so that the page numbers align at the end of the field: #include <iostream.h>
main0 -t cout.setf(ios::left); cout.fill('.'); const int w = 60; cout.width(w); tout << "\t 10 A String Class" << "222\n"; cout.width(w); tout << "\t 11 Inheritance" << "244\n"; cout.width(w); tout << "\t 12 Streams" +c "273\n";
STREAM I/O
[CHAP. 12
Write a function to reverse a string in place (Le., without duplicating all the characters).
void reverse(char* s) char temp; char* end = s + strlen(s) - 1; while (s c end) { temp = *s; *s++ = *end; *end-- = temp;
Supplementary Problems
What shou.ld the function prototype for the ends stream manipulator look like Write code that formats cou t so that floats are printed in scientific notation with 12-digit precision. Supplementary Programming Problems
12.15 Write a program that uses the set f ( ) , f i 11( > , and width ( > functions to produce the following formatted output:
4 5 6 Functions........................................5 Arrays...........................................8 Pointers and References.........................11 6 5 3
The trick here is to left-justify the titles, as done in Problem 12.11, and to right-justify the page numbers in another fixed-length field.
Write a program that uses the set f ( > , f i 1 1 ( ) , and width ( ) functions to produce the following formatted output:
4 5 6 Functions........................................5 Arrays...........................................8 Pointers and References.........................11 6 5 3
Write code for each of the following: a. Print the integer 12345 in a left-justified 12-digit field. b. Print the integer 1000 in hexadecimal with the OX prefix. c. Print 3.14159 in a 12-digit field with preceding zeros. d. Print in a 40-column field, Hello left-justified and World right-justified, padding between them with the 1! 1character. e. Read an integer in decimal and print it in octal. J Read an integer in hexadecimal and print it in decimal.
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