ssrs 2016 qr code Strings Are Terminated with the NUL Character in Software

Paint QR Code in Software Strings Are Terminated with the NUL Character

EXAMPLE 7.2 Strings Are Terminated with the NUL Character
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I is appended to the string:
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main0 { char s[] = ABCD ; for (int i = 0; i c 5; i++) tout CC "s[" cc i CC "1 =
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"1 CC s[i] CC "'\n";
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When the NUL character is sent to cou t, nothing is printed- not even a blank. This is seen by printing one apostrophe immediately before the character and another apostrophe immediately after the character.
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STRINGS
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7.4 STRING I/O Input and output of strings is done in several ways in C++ programs. The best way is by means of string class operators as described in 10. More straightforward methods are described here.
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EXAMPLE 7.3 Ordinary Input and Output of Strings This program reads words into a 79-character
main0 char word[80]; do 1 tin >> word; if (*word) tout CC "\t\"" } while (*word);
buffer:
CC word cc "\"\n";
In this Iun, the whi le loop iterated 10 times: once for each word entered (including the Control-D that stopped the loop). Each word in the input stream c in is echoed to the output stream cou t. Note that the output stream is not flushed until the input stream encounters the end of the line. Each string is printed with a double quotation mark on each side. This character must be designated by the character pair \ I inside a string literal. The expression *word controls the loop. It is the initial character in the string. It will be nonzero (i.e., true ) as long as the string word contains a string of length greater than 0. The string of length 0, called the empty string, contains the NUL character I\ 0 I in its first element. Pressing Control-D on a UNIX or Macintosh computer (Control-Z on a DOS PC or in VAX/VMS) sends the end-of-file character in from tin. This loads the empty string into word, setting *word (which is the same as word [ 0 ] ) to and stopping the loop. The last line of output shows only the Control-D echo. Note that punctuation marks (apostrophes, commas, periods, etc.) are included in the strings, but whitespace characters (blanks, tabs, newlines, etc.) are not. The do loop in Example 7.3 could be replaced with:
I \o
tin >> word while (*word) { tout CC "\t\"" CC word CC "\"\n"; tin >> word;
When Control-D is pressed, the call tin >> word assigns the empty string to word.
STRINGS
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Example 7.3 and Example 7.1 illustrate an important distinction: the output operator CC behaves differently with pointers of type char* than with other pointer types. With a char* pointer, the operator outputs the entire character string to which the pointer points. But with any other pointer type, the operator will simply output the address of the pointer.
7.5 SOME tin MEMBER FUNCTIONS
The input stream object tin includes the input functions: tin. getline ( ) , tin . get ( ) , tin. ignore ( >-, tin .putback ( > , and tin. peek ( > . Each of these function names includes the prefix tin . because they are member functions of the tin object. This object-oriented principle is explained in s 8 and 12. The call
in. get line
tr , n)
reads up to n characters into s tr and ignores the rest.
EXAMPLE 7.4 The c in. get 1 ine ( )
Function with Two Parameters
This program echoes the input, line by line:
main0 1 char line[80]; do -t cin.getline(line, 80); if (*line) tout << "\t[" } while (*line);
CC line << "]\n';
Note that the condition ( * 1 ine ) will evaluate to true precisely when 1 ine contains a non-empty string, because only then will 1 ine [ 0 ] be different from the NUL character (whose ASCII value is 0).
The call tin . getline ( s tr , n, ch) reads all input up to the first occurrence of the delimiting character ch into s tr. If the specified character ch is the newline character I\n I, then this is equivalent to c in. get 1 ine ( s tr , n > . This is illustrated in the next example where the delimiting character is the comma I, I.
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