Denne medlemsfunktion tilføjer tegn i slutningen af ​​strengen.

Syntaks 1 : Tilføjer tegnene i streng str. Det kaster length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (const string& str)  str :  is the string to be appended. Returns :  *this>













// CPP code to demonstrate append(str)> > #include> #include> using> namespace> std;> > // Function to demonstrate append()> void> appendDemo(string str1, string str2)> {> >// Appends str2 in str1> >str1.append(str2);> >cout <<>'Using append() : '>;> >cout << str1 << endl;> }> > // Driver code> int> main()> {> >string str1(>'Hello World! '>);> >string str2(>'techcodeview.com'>);> > >cout <<>'Original String : '> << str1 << endl;> >appendDemo(str1, str2);> > >return> 0;> }>

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Produktion:

 Original String : Hello World! Using append() : Hello World! techcodeview.com>

Syntaks 2 : Tilføjer højst str_num tegn af streng str, startende med index str_idx. Det kaster out_of_range hvis str_idx> str. størrelse(). Det kaster length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (const string& str, size_type str_idx, size_type str_num) str : is the string to be appended str_num : being number of characters str_idx : is index number. Returns :  *this.>








// CPP code to demonstrate> // append(const char* chars, size_type chars_len)> > #include> #include> using> namespace> std;> > // Function to demonstrate append()> void> appendDemo(string str1, string str2)> {> >// Appends 5 characters from 0th index of> >// str2 to str1> >str1.append(str2, 0, 5);> >cout <<>'Using append() : '>;> >cout << str1;> }> > // Driver code> int> main()> {> >string str1(>'techcodeview.com '>);> >string str2(>'Hello World! '>);> > >cout <<>'Original String : '> << str1 << endl;> >appendDemo(str1, str2);> > >return> 0;> }>

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Produktion:

 Original String : techcodeview.com Using append() : techcodeview.com Hello>

Syntaks 3: Tilføjer tegnene i C-strengen cstr. Kast length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (const char* cstr) *cstr : is the pointer to C-string. Note : that cstr may not be a null pointer (NULL). Return : *this>








// CPP code to demonstrate append(const char* cstr)> > #include> #include> using> namespace> std;> > // Function to demonstrate append> void> appendDemo(string str)> {> >// Appends 'techcodeview.com'> >// in str> >str.append(>'techcodeview.com'>);> >cout <<>'Using append() : '>;> >cout << str << endl;> }> > // Driver code> int> main()> {> >string str(>'World of '>);> > >cout <<>'Original String : '> << str << endl;> >appendDemo(str);> > >return> 0;> }>

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Produktion:

 Original String : World of Using append() : World of techcodeview.com>

Syntaks 4: Tilføjer chars_len-tegn af tegnarray-tegnene. Kaster length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (const char* chars, size_type chars_len) *chars is the pointer to character array to be appended. chrs_len : is the number of characters from *chars to be appended. Note that chars must have at least chars_len characters. Returns : *this.>








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// CPP code to demonstrate> // (const char* chars, size_type chars_len)> > #include> #include> using> namespace> std;> > // Function to demonstrate append> void> appendDemo(string str)> {> >// Appends 5 characters from 'techcodeview.com'> >// to str> >str.append(>'techcodeview.com'>, 5);> >cout <<>'Using append() : '>;> >cout << str << endl;> }> > // Driver code> int> main()> {> >string str(>'World of '>);> > >cout <<>'Original String : '> << str << endl;> >appendDemo(str);> > >return> 0;> }>

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Produktion:

 Original String : World of Using append() : World of Geeks>

Syntaks 5: Tilføjer antal forekomster af tegn c. Kaster length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (size_type num, char c) num : is the number of occurrences c :  is the character which is to be appended repeatedly. Returns : *this.>








// CPP code to illustrate> // string& string::append (size_type num, char c)> > #include> #include> using> namespace> std;> > // Function to demonstrate append> void> appendDemo(string str)> {> >// Appends 10 occurrences of '$'> >// to str> >str.append(10,>'$'>);> >cout <<>'After append() : '>;> >cout << str;> > }> > // Driver code> int> main()> {> >string str(>'#########'>);> > >cout <<>'Original String : '> << str << endl;> >appendDemo(str);> > >return> 0;> }>

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Produktion:

 Original String : ######### After append() : #########$$$$$$$$$$>

Syntaks 6: Tilføjer alle tegn i området [beg, end). Kaster length_error, hvis den resulterende størrelse overstiger det maksimale antal tegn.

 string& string::append (InputIterator beg, InputIterator end) first, last : Input iterators to the initial and final positions in a sequence. Returns *this.>








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// CPP code to illustrate> // append (InputIterator beg, InputIterator end)> > #include> #include> using> namespace> std;> > // Function to demonstrate append> void> appendDemo(string str1, string str2)> {> > >// Appends all characters from> >// str2.begin()+5, str2.end() to str1> >str1.append(str2.begin() + 5, str2.end());> >cout <<>'Using append : '>;> >cout << str1;> }> // Driver code> int> main()> {> >string str1(>'Hello World! '>);> >string str2(>'techcodeview.com'>);> > >cout <<>'Original String : '> << str1 << endl;> >appendDemo(str1, str2);> > >return> 0;> }>

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