ssrs 2016 qr code The call s t rca t ( s 1, s 2 ) appends in Software

Encoder QR Code in Software The call s t rca t ( s 1, s 2 ) appends

The call s t rca t ( s 1, s 2 ) appends
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z onto the end of s 1. It can be visualized like this:
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Since s2 has length 3, s trca t ( s 1, s2 ) copies 4 bytes (including the NUL character, shown as a), overwriting the NUL characters of s 1 and its following 3 bytes. The length of s 1 is increased to 10.
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If any of the extra bytes following s 1 that are needed to copy ~2 are in use by any other object, then all of s 1 and its appended s 2 will be copied to some other free section of memory.
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EXAMPLE 7.18 The Second String Concatenation Function s trnca t ( ) This program traces calls s trnca t ( s 1, s 2 , n) :
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#include <iostream.h> #include <string.h> // Test-driver for the strncat() function: main0 1 char sl[] = "ABCDEFG"; char s2[] = "XYZ"; tout << 'Before strncat(sl,s2,2):\n"; tout << '\tsl = [" c< sl cc "1, length = tout << "\ts2 = [" << s2 cc "1, length = ' strncat(sl,s2,2); tout << "After strncat(sl,s2,2):\n"; tout << "\tsl = [" << sl cc "1, length = tout << '\ts2 = [" <c s2 cc "1, length = " >
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" << strlen(s1) c< endl; <c strlen(s2) <C endl;
' << strlen(s1) << endl; cc strlen(s2) << endl;
The output looks like this:
The call s t rnca t ( s 1, s 2 ,2-) appends
onto the end of s 1. The effect can be visualized like this:
strncat(sl,s2,2)
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Since s2 has length 3, s trnca t ( s 1, s2 ,2 ) copies 2 bytes overwriting the NUL character of s 1 and the byte that follows it. Then it puts the ~UL character in the next byte to complete the string s 1. This increases its length to 9. (If either of the extra 2 bytes had been in use by some other object, then the entire 10 characters ABCDEFGXYO would have been written in some other free part of memory.)
The next example illustrates the string tokenize&nction. within a given string: e.g., words in a sentence.
EXAMPLE 7.19 The String Tokenize Function s t r tok ( )
Its purpose is to identify tokens
This program shows how strtok ( ) is used to extract the individual words from a sentence.
#include <iostream.h> #include <string.h> // Test-driver for the strtok() main0
function:
char s[] = "Today's date is March 12, 1995."; char* p; tout << "The string is: [" << s << ']\nIts tokens are:\n"; P = strtok(s, I' I'); while (p) { tout << "\t[" CC p CC "]\n"; P = strtok(NULL, ' ">; ) c-c s cc "]\n"; tout << "Now the string is:
II [
._' she st~ing.is.:..,~To~~~ls,d~~~ is,%aJrch 12,. 1995liJ _ I: I. .: ..I. '. I. : :: 3353 tokens are: .-. '..'. : _' '. ..' . . . : :. .,.., . i: Today.' s J ... .: _.,_ . [date) '_ ', .: : .: '_ ; . : :.; '_ . : ',_ ._ [is] . '.. : _:. .:. '. : < :: [mcch] _ [.I2 f. j. , , , , , ., ., ,: ,, : ', , ,; ., , , ,_ , .,., ., ,. I:. ., ., ,., .,I..:. . . . I. .: .'jl.:. .~.r-I::..;...~:r'i~.--i~:~~: _ I .,:. ., :..;. . _ ._ '._ '. '.: ::.:, . . .'._ ,_, [l2wi.J: .: ',-. : HOW $-he string is : [Today f s) - _. '. 1 '. .,., .,"' '. -'.: . _. %":. : .:,;,.;. _. .i:', 'y :: The call p = strtok(s, I I > sets the pointer p to point to the first token in the string s and changes the blank that follows I Today 1 I to the NUL character 1 0 I (denoted by @ in the following s \ diagram). This has the effect of making both s and p the string I Today 1s II. Then each successive call p = strtok(NULL, ' I > advances the pointer p to the next non-blank character that follows the new NUL character, changing each blank that it passes into a NUL character, and changing the first blank that follows *p into a NUL character. This has the effect of making p the next substring that was delimited by blanks and is now delimited by NUL characters. This continues until p reaches the NUL character that terminated the original string s. That makes p NUL (i.e., 0), which stops the whi 1 e loop. The combined effect upon the original string s of all the calls to s t r t o k ( > is to change every blank into a NUL. This tokenizes the string s, changing it into a sequence of distinct token strings, only the first of which is identified by s.
Note that the s tr tok ( > function changes the string that it tokenizes. Therefore, if you want to use the original string after you tokenize it, you should duplicate it with s trcpy ( > .
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