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The next example illustrates the C-string tokenize function. Its purpose is to identify tokens within a given C-string: e.g., words in a sentence. EXAMPLE 8.19 The String Tokenize Function strtok()
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This program shows how strtok() is used to extract the individual words from a sentence. #include <cstring> #include <iostream> using namespace std; int main() { // test-driver for the strtok() function: char s[] = "Today's date is March 12, 2000."; char* p; cout << "The string is: [" << s << "]\nIts tokens are:\n"; p = strtok(s, " ");
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while (p) { cout << "\t[" << p << "]\n"; p = strtok(NULL, " "); } cout << "Now the string is: [" << s << "]\n"; } The string is: [Today's date is March 12, 2000.] Its tokens are: [Today's] [date] [is] [March] [12,] [2000.] Now the string is: [Today's]
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The call p = strtok(s, " ") sets the pointer p to point to the first token in the C-string s and changes the blank that follows "Today's" to the NUL character '\0' (denoted by in the following diagram). This has the effect of making both s and p the C-string "Today's". Then each successive call p = strtok(NULL, " ") 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 C-string s. That makes p NUL (i.e., 0), which stops the while loop. The combined effect upon the original C-string s of all the calls to strtok() is to change every blank into a NUL. This tokenizes the C-string s , changing it into a sequence of distinct token strings, only the first of which is identified by s.
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Note that the strtok() function changes the C-string that it tokenizes. Therefore, if you want to use the original C-string after you tokenize it, you should duplicate it with strcpy(). Also note that the second parameter of the strtok() function is a C-string. This function uses all the characters in this C-string as delimiters in the first C-string. For example, to identify words in s, you might use strtok(s, " ,:;."). The strpbrk() function also uses a C-string of characters as a collection of characters. It generalizes the strchr() function, looking for the first occurrence in the first C-string of any of the characters in the second C-string.
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EXAMPLE 8.20 The strpbrk() Function
#include <cstring> #include <iostream> using namespace std; int main() { char s[] = "The Mississippi is a long river."; cout << "s = \"" << s << "\"\n"; char* p = strpbrk(s, "nopqr"); cout << "strpbrk(s, \"nopqr\") points to s[" << p - s << "].\n"; p = strpbrk(s, "NOPQR"); if (p == NULL) cout << "strpbrk(s, \"NOPQR\") returns NULL.\n"; } s = "The Mississippi is a long river." strpbrk(s, "nopqr") points to s[12]. strpbrk(s, "NOPQR") returns NULL.
The call strpbrk(s, "nopqr") returns the first occurrence in s of any of the five characters 'n', 'o', 'p', 'q', or 'r'. The first of these found is the 'p' at s[12]. The call strpbrk(s, "NOPQR") returns the NULL pointer because none of these five characters occurs in s.
The following table summarizes some of the most useful functions declared in <cstring>. Note that size_t is a special integer type that is defined in the <cstring> file.
memcpy() void* memcpy(void* s1, const void* s2, size_t n); Replaces the first n bytes of *s1 with the first n bytes of *s2. Returns s. char* strcat(char* s1, const char* s2); Appends s2 to s1. Returns s1 . char* strchr(const char* s, int c); Returns a pointer to the first occurrence of c in s. Returns NULL if c is not in s. int strcmp(const char* s1, const char* s2); Compares s1 with substring s2. Returns a negative integer, zero, or a positive integer, according to whether s1 is lexicographically less than, equal to, or greater than s2. char* strcpy(char* s1, const char* s2); Replaces s1 with s2. Returns s1. size_t strcspn(char* s1, const char* s2); Returns the length of the longest substring of s1 that begins with s1[0] and contains none of the characters found in s2. size_t strlen(const char* s); Returns the length of s, which is the number of characters beginning with s[0] that precede the first occurrence of the NUL character. char* strncat(char* s1, const char* s2, size_t n); Appends the first n characters of s2 to s1. Returns s1. If n strlen(s2), then strncat(s1,s2,n) has the same effect as strcat(s1,s2).
strcat()
strchr()
strcmp()
strcpy()
strcspn()
strlen()
strncat()
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