String manipulation in C++

String manipulation in C++: The manipulation of strings in C++ can be defined as we have already learned that C++ will not support the built-in string type. So, we have used the null character based terminated array of characters to store the manipulated strings.

String manipulation in C++

Manipulating Null terminated Strings

C++ supports a wide range of functions that manipulate null-terminated strings. They are as follows:

  • strcpy(str1, str2): It copies the string str2 into string str1.
  • strcat(str1, str2): Concatenates string str2 onto the end of string str1.
  • strlen(str1): Returns the length of string str1.
  • strcmp(str1, str2): Returns 0 if str1 and str2 are the same; less than 0 if str1<str2, greater than 0 if str1>str2.
  • strchr(str1, ch): Returns a pointer to the first occurrence of character ch in string str1.
  • strstr(str1, str2): Returns a pointer to the first occurrence of string str2 in string str1.

Functions Supported by string Class in C++

Function Description
append( ) appends a part of a string to another string
assign( ) The function assigns a partial string
at( ) function obtains the character stored at a specified location
begin( ) The function returns a reference to the start of the string
capacity( ) Gives the total element that can be stored
compare( ) compares a string against the invoking string
empty( ) returns true if the string is empty
end( ) returns a reference to the end of the string
erase( ) removes the character as specified
find( ) searches for the occurrence of a specified substring
length( ) It gives the size of a string or the number of elements of a string
swap( ) This function swaps the given string with the invoking one

 Important Constructors Obtained by String Class

Constructor Description
String( ) the constructor is used for creating an empty string
String(const char *str) used for creating string objects from a null-terminated string
String(const string *str) used for creating a string object from another string object