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It returns a pointer to the last occurrence of the low-order byte of ch in the string pointed to by str If no match is found, a null pointer is returned The strtok( ) function is also used to search a string It is described in its own recipe See Tokenize a Null-Terminated String
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Reverse a Null-Terminated String
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Headers <cstring> Classes Functions size_t strlen(char *str)
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This recipe shows how to perform one simple, yet useful task It reverses a null-terminated string Although reversing a string is an easy operation for the experienced programmer, it is a common source of questions from beginners For this reason alone it merits inclusion in this book However, there are several other reasons to include this recipe First, there are many ways to reverse a string, and each variation illustrates a different technique for handling a null-terminated string Second, the basic mechanism used to reverse a string can be adapted to other types of string manipulations Finally, it demonstrates in very practical terms how handling null-terminated strings often relies on fairly low-level, hands-on code Often, such code can be highly efficient, but it requires more work than using the string class The recipe shown here reverses the string in place This means that the original string is modified This is often what is needed However, a variation that creates a reverse copy of the string is shown in the Options and Alternatives section for this recipe
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There are many ways to approach the task of reversing a string This recipe uses a simple, yet effective method that is based on swapping end-to-end corresponding characters in the string It puts this code inside a function called revstr( ) 1 Create a function called revstr( ) that has this prototype:
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void revstr(char *str);
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The string to be reversed is passed to str 2 Inside revstr( ), create a for loop that controls two variables that will be used to index the array that holds the string Initialize the first variable to zero and increment it each time through the loop Initialize the second variable to the index of the last character in the string and decrement it with each iteration This value is obtained by calling strlen( ) 3 With each pass through the loop, swap the characters at the two indexes 4 Stop the loop when the first index is equal to or greater than the second index At this point, the string has been reversed
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Herb Schildt's C++ Programming Cookbook
Discussion
As most readers know, when an array name is used by itself, without an index, it represents a pointer to the array Therefore, when you pass an array to a function, you are actually passing only a pointer to that array This means that a function that will receive a nullterminated string as an argument must declare its parameter to be of type char * This is why the str parameter to revstr( ) is declared as char *str Although str is a pointer, it can be indexed like an array, using the normal array-indexing syntax To reverse the contents of the string, create a for loop that controls two variables, which serve as indexes into the string One index starts at zero and indexes from the beginning of the string The other index starts at the last character in the string Each time through the loop, the characters at the specified indexes are exchanged Then, the first index is incremented and the second index is decremented When the indexes converge (that is, when the first index is equal to or greater than the second index), the string is reversed Here is one way to write this loop:
int i, j; char t; for(i = 0, j = strlen(str)-1; i < j; ++i, --j) { // Exchange corresponding characters, front to back t = str[i]; str[i] = str[j]; str[j] = t; }
Notice that the index of the last character in the string is obtained by subtracting one from the value returned by strlen( ) Its prototype is shown here: size_t strlen(const char *str) The strlen( ) function returns the length of a null-terminated string, which is the number of characters in the string However, the null terminator is not counted Since array indexing in C++ begins at zero, 1 must be subtracted from this value to obtain the index of the last character in the string
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