C++ String Class

In C++ String Class is provided for manipulation of strings . It is more user friendly .The functions of this class can be accessed using a  (".") operators.

To include this class we have to use 

using namespace std

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To initialize a String

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string a="This is my code";

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Functions Provided In String class

find()-  This function returns the position of a particular character .

substr()- This function returns the desired string with in a string.

length()-This Function returns the number of character in the given string.

compare()- This function compare two string and return a bool result.

find_first_of()- This functions find the first occurring of a character in the string

find_last_of()- This functions find the first occurring of a character in the string


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Program to find the number of vowels in a string
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long numvowel(string a1)

{

int count=0;

string str1;

string::iterator it;

for(it=a1.begin() ; it < a1.end();it++)

{

str1=*it;

if(str1.compare("a")==0 || str1.compare("A")==0|| str1.compare("e")==0|| str1.compare("E")==0|| str1.compare("i")==0|| str1.compare("I")==0|| str1.compare("A")==0|| str1.compare("o")==0|| str1.compare("O")==0|| str1.compare("u")==0|| str1.compare("U")==0)

{ 

count++;

}

else 

count;

}

return count;

}

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function to reverse a string 

********************************************************************************

string reverse(string a1)
{
string temp;
string str1;
string::reverse_iterator rit;
int i=0;
for ( rit=a1.rbegin() ; rit < a1.rend(); rit++ )

{
  temp=*rit;
  str1.append(temp);
  i++;

}


return str1;
}
**********************************************************************************
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To check if a given string is palindrome or not


*************************************************************************

string palindrome(string a1)
{
string temp;
string str1;
int i=0;
string::reverse_iterator rit;
str1=reverse(a1);

i=str1.compare(a1);
if(i==0)
{
return "TRUE";
}
else

return "False";
}
*************************************************************************
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Function to find number of blank space in a string
***********************************************************************

int blankspace(string a1)
{
string str1;
int count=0;
string::iterator it;
for(it=a1.begin() ; it < a1.end();it++)
{
str1=*it;


if(str1.compare(" ")==0)
{
count++;
}
else
count;
}

return count;

}

**************************************************************************

Function prototype

long numchar(string);

int blankspace(string);

long numwords(string);

long numvowel(string);

string reverse(string);

string palindrome(string);

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You must have to include using namespace std;

 main function which call all this function

**************************************************************************

void main()

{

string a="This code is primarily developed to understanding from basic";

string str1,str2;

string::iterator i;

printf("The number of charactres in this string is:%d \n",numchar(a));

printf("The number of blankspace in this string is:%d \n",blankspace(a));

printf("The number of vowels in this string is:%d \n",numvowel(a));

str1=reverse(a);

for(i=str1.begin();i<str1.end();i++)

{

printf("%c",*i);

}

str2=palindrome(a);

printf("\n Given String is palindrome  :");

for(i=str2.begin();i<str2.end();i++)

{

printf("%c",*i);

}

_getch();

}

****************************************************************************

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