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There are two functions that simulate the assignment operator for strings: strcpy() and call strcpy(sl,s2) copies string s 2 into string ~1. The call copies the first n characters of string ~2 into string s 1. Both functions return ~1. These are illustrated in the next two examples.
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strncpyo. The strncpy(sl,s2,n)
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STRINGS
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[CHAP. 7
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EXAMPLE 7.15 The String Copy Function s trcpy ( )
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This program traces call s t rcpy ( s 1, s 2 ) : #include #include main0 ciostream.h> <string.h>
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char sl [ ] = I ABCDEFG It ; char s2[] = XYZ ; tout << 'Before strcpy(sl,s2):\n'; tout CC '\tsl = [' << sl CC "1, length tout <C "\ts2 = [" CC s2 C< "1, length strcpy(sl,s2); tout << "After strcpy(sl,s2):\n"; tout CC '\tsl = [' CC sl CC "1, length tout CC '\ts2 = [" CC s2 CC "1, length 1
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= ' CC strlen(s1) << endl; = ' CC strlen(s2) CC endl;
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= ' CC strlen(s1) << endl; = ' CC strlen(s2) CC endl;
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After s 2 is copied into s 1, they are indistinguishable: both consist of the 3 characters effect of s trcpy ( s 1, s 2 ) can be visualized like this:
XYZ .
43 I
Since s2 has length 3, s trcpy ( s 1, s2 ) copies 4 bytes (including the NUL character, shown as D), overwriting the first 4 characters of s 1. This changes the length of s 1 to 3. Note that s t rcpy ( s 1, s 2 > creates a duplicate of string s2. The resulting two copies are distinct strings. Changing one of these strings later would have no effect upon the other string.
CHAP. 71
STRINGS
EXAMPLE 7.16 The Second String Copy Function ,s t rncpy ( ) This program traces calls s t rncpy ( s 1, s2 , n ) : #include ciostream.h> #include cstring.h> // Test-driver for the strncpy() function: main0 { char sl[] = "AKDEFGQ char s2[] = "XYZ"; tout << "Before strncpy(sl,s2,2) :\n"; tout << "\tsl = [" cc ~1 CC "1, length = tout << "\ts2 = [" << ~2 << "1, length = strncpy(sl,s2,2); tout << "After strncpy(sl,s2,2) :\n"; tout << "\tsl = [" CC ~1 << "1, length = tout << "\ts2 = [" << ~2 CC "1, length =
' << strlen(sl)
endlo
' << strlen(s2)
<< end11 I
' CC strlen(s1) ' CC strlen(s2)
<< end10 << end11 I
The call s trncpy ( s 1, s 2 ,2 ) replaces the first 2 characters of s 1 with unchanged. The effect of s trncpy ( s 1, s2 ,2 ) can be visualized like this:
leaving the rest of s 1
A B C D E F G 0
strncpy(
s2pJYp-j
Y Z 0
Since s2 has length 3, s trncpy ( s 1, s2 ,2 > copies 2 bytes (excluding the NUL character Q), overwriting the first 2 characters of s 1. This has no effect upon the length of s I which is 7.
simply copies If n < s trlen ( ~2 > , as it is in the above example, then s trncpy ( ~1, ~2, n > the first n characters of ~2 into the beginning of ~1. However, if n 2 s trlen ( ~2 > , then
STRINGS
[CHAP. 7
strncpy(sl,s2,n) hasthesameeffectas strcpy(sLs2):itmakes SI aduplicateof s2 with the same length. T h e strcat() a n d strncat() functions work the same as the s trcpy ( ) and s trncpy ( > functions except that the characters from the second string are copied onto the end of the first string. The term cat" comes from the word catenate meaning string together. EXAMPLE 7.17 The String Concatenation Function s treat ( )
This program traces call s t rca t ( s 1, s 2 >
which appends the string s 2 onto the end of string s 1:
#include <iostream.h> #include <string.h> // Test-driver for the strcat() function: main0 -t char sl[] = "ABCDEFG"; char s2[] = "XYZ"; tout << "Before strcat(sl,s2):\n"; tout -K< "\tsl = [" << sl c< "1, length = tout << "\ts2 = [" << s2 << "1, length = strcat(sl,s2); tout << "After strcat(sl,s2):\n"; tout << "\tsl = [" << sl << "1, length = tout << "\ts2 = [" -K s2 << "1, length = >
' << strlen sl) C< endl; ' c< strlen s2) CC endl;
' << strlen sl) -H endl; ' << strlen s2) c< endl;
Here is the output:
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