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Full Discussion: Concatenate two strings
Top Forums Programming Concatenate two strings Post 302854977 by Corona688 on Wednesday 18th of September 2013 05:16:10 PM
Old 09-18-2013
Quote:
Originally Posted by yifangt
Thanks!
Got the part for a[256], but not the stradd() function. I thought to use a = b, why shouldn't I?
Consider it like this:
Code:
char arraya[64]="abcdefg";
char arrayb[64]="qwerty";

int a=0;
int b=5;

printf("%c\n", arraya[a]);
printf("%c\n", arrayb[b]);

// Altering a does not alter arraya, just a!
a=b;

'char *' is like that variable 'a' up there. It doesn't tell you anything but where memory is.

The * operator dereferences it, (*a) in your code is like arraya[a] in my example.

The [] operator also dereferences it, like a[2] in your code would be like arraya[a+2] in my example.

Now, imagine that all memory in your process is all one great big array, so that 'a' and 'b' are simply different locations in the same big block. Altering those numbers doesn't change the memory they refer to.
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SbString(3)							       Coin							       SbString(3)

NAME
SbString - The SbString class is a string class with convenience functions for string operations. This is the class used for storing and working with character strings. It automatically takes care of supporting all the 'bookkeeping' tasks usually associated with working with character strings, like memory allocation and deallocation etc. SYNOPSIS
#include <Inventor/SbString.h> Public Member Functions SbString (void) SbString (const char *s) SbString (const char *s, int start, int end) SbString (const SbString &s) SbString (const int digits) ~SbString () uint32_t hash (void) const int getLength (void) const void makeEmpty (SbBool freeold=TRUE) const char * getString (void) const SbString getSubString (int startidx, int endidx=-1) const void deleteSubString (int startidx, int endidx=-1) void addIntString (const int value) char operator[] (int index) const SbString & operator= (const char *s) SbString & operator= (const SbString &s) SbString & operator+= (const char *s) SbString & operator+= (const SbString &s) SbString & operator+= (const char c) int operator! (void) const int compareSubString (const char *text, int offset=0) const SbString & sprintf (const char *formatstr,...) SbString & vsprintf (const char *formatstr, va_list args) void apply (char(*func)(char input)) int find (const SbString &s) const SbBool findAll (const SbString &s, SbIntList &found) const SbString lower () const SbString upper () const Static Public Member Functions static uint32_t hash (const char *s) Friends int operator== (const SbString &sbstr, const char *s) int operator== (const char *s, const SbString &sbstr) int operator== (const SbString &str1, const SbString &str2) int operator!= (const SbString &sbstr, const char *s) int operator!= (const char *s, const SbString &sbstr) int operator!= (const SbString &str1, const SbString &str2) const SbString operator+ (const SbString &str1, const SbString &str2) const SbString operator+ (const SbString &sbstr, const char *s) const SbString operator+ (const char *s, const SbString &sbstr) Detailed Description The SbString class is a string class with convenience functions for string operations. This is the class used for storing and working with character strings. It automatically takes care of supporting all the 'bookkeeping' tasks usually associated with working with character strings, like memory allocation and deallocation etc. This class should also be well suited for use by the application programmer throughout the application using the Coin library. See also: SbName Constructor &; Destructor Documentation SbString::SbString (void) [inline] This is the default constructor. It initializes the string to be empty. SbString::SbString (const char *str) [inline] This constructor assigns from the given string. SbString::SbString (const char *str, intstart, intend) [inline] This constructor constructs a string from the given substring from start to end indices inclusive. If end is -1, the substring from start until the end of the string is used. SbString::SbString (const SbString &str) [inline] This is the copy constructor. SbString::SbString (const intdigits) [inline] Construct an SbString instance containing the digits of the integer argument. SbString::~SbString () [inline] The destructor. Deallocates any internal resources used during the lifetime of the SbString instance. Member Function Documentation uint32_t SbString::hash (void) const [inline] This method returns a reasonable hash value for the current string. See also: uint32_t SbString::hash(const char * s) uint32_t SbString::hash (const char *s) [inline], [static] This static method returns a hash value for the given string. int SbString::getLength (void) const [inline] This method returns the length of the string. void SbString::makeEmpty (SbBoolfreeold = TRUE) [inline] This method clears the string, making it an empty string (''). If freeold is TRUE (which is the default), the memory used by the old string is freed. Otherwise, memory will be kept and reused when the string is manipulated later. const char * SbString::getString (void) const [inline] This method returns the pointer to the string (character array). SbString SbString::getSubString (intstartidx, intendidx = -1) const [inline] This method returns a new string which contains a substring defined by the given indices startidx and endidx (inclusive). If endidx is -1, the substring from startidx to the end of the string is used. This will return a string which is (endidx - startidx + 1) characters long, i.e. if this string is 'foo/bar' and we call by SbString::getSubString(0, 3), the returned string will be 'foo/'. void SbString::deleteSubString (intstartidx, intendidx = -1) [inline] This method deletes the substring defined by startidx and endidx (inclusive). If endidx is -1, the substring from startidx to the end of the string is deleted. void SbString::addIntString (const intvalue) [inline] Constructs a string from the given integer (e.g. intToString(42) creates the string '42'), and adds this to the contents of the string. char SbString::operator[] (intindex) const [inline] Returns character at position index in the string. See also: getSubString() SbString & SbString::operator= (const char *str) [inline] This is the assignment operator. SbString & SbString::operator= (const SbString &str) [inline] Assign from the given string. SbString & SbString::operator+= (const char *str) [inline] Concatenate the given string to the end of the current one. SbString & SbString::operator+= (const SbString &str) [inline] Concatenate the given string to the end of the current one. SbString & SbString::operator+= (const charc) [inline] Concatenate the given character to the end of the current string. Note: This member function is not compatible with OpenInventor. int SbString::operator! (void) const [inline] This unary operator results in TRUE if the current string is empty ('') or FALSE otherwise. int SbString::compareSubString (const char *text, intoffset = 0) const [inline] Uses text as a substring to be compared to the string, starting at offset offset. Return value is 0 upon success, and the failing character comparison difference upon failure. SbString & SbString::sprintf (const char *formatstr, ...) [inline] Set SbString instance to the formatted string formatstr, replacing the current contents. The control characters within formatstr and the remaining arguments should follow the conventions of the printf() call. Note that this function is not part of the original Open Inventor API. SbString & SbString::vsprintf (const char *formatstr, va_listargs) [inline] Set SbString instance to the formatted string formatstr, replacing the current contents. The control characters within formatstr and the arguments of the args argument list should follow the conventions of the printf() call. Note that this function is not part of the original Open Inventor API. int SbString::find (const SbString &strarg) const If s is found, the method returns the first index where s starts. Otherwise it returns -1. Note: SbString::find() is a Coin specific extension to the original Open Inventor API. See also: SbString::findAll() Since: Coin 2.0 SbBool SbString::findAll (const SbString &strarg, SbIntList &found) const All occurences of str is represented in found as indices to the characters where str starts. If 1 or more is found, TRUE is returned, else FALSE is returned. Note: SbString::findAll() is an extension to the original Open Inventor API. See also: SbString::find() Since: Coin 2.0 SbString SbString::lower () const Converts all of the characters to lowercase using tolower(). Since: Coin 3.1 SbString SbString::upper () const Converts all of the characters to uppercase using toupper(). Since: Coin 3.1 Friends And Related Function Documentation int operator== (const SbString &str, const char *s) [friend] Equality operator. Check if the strings have the same contents. int operator== (const char *s, const SbString &str) [friend] Equality operator. Check if the strings have the same contents. int operator== (const SbString &str1, const SbString &str2) [friend] Equality operator. Check if the strings have the same contents. int operator!= (const SbString &str, const char *s) [friend] Inequality operator. int operator!= (const char *s, const SbString &str) [friend] Inequality operator. int operator!= (const SbString &str1, const SbString &str2) [friend] Inequality operator. const SbString operator+ (const SbString &str1, const SbString &str2) [friend] Addition operator. const SbString operator+ (const SbString &sbstr, const char *s) [friend] Addition operator. const SbString operator+ (const char *s, const SbString &sbstr) [friend] Addition operator. Author Generated automatically by Doxygen for Coin from the source code. Version 3.1.3 Wed May 23 2012 SbString(3)
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