How to count a specific character in a string (C++ Tutorial)

Counting specific character in a string

CountCharacter() takes two arguments as its input parameter; first is the string and the second is the character to count.

Code of CountCharacter()

int CountCharacter( char * str , char ch )

{

       int countChar = 0;

       for ( int i = 0; str[i] != '\0'; i++)

       {

               if ( str[i] == ch )

                     countChar = countChar + 1;

       }

       return countChar;

}

Summary of CountCharacter()

First a variable countChar is declared and initialized as 0.

After that a for loop starts from the 0^th index of the string and iterates till end.End of the string is indicated by '\0'.At each iteration the current character is compared with the character to count.

   if ( str[i] == ch )

If the current character of the string is equal to the character to count, then it increaments the countChar variable:

   countChar = countChar + 1;

At the end of the for loop, the value of the countChar variable is returned from the function – which gives the count of the specific character.

Code

#include "stdafx.h"

#include "iostream.h"

#include "conio.h"

using namespace std;

int CountCharacter( char * str , char ch )

{

       int countChar = 0;

      
      for ( int i = 0; str[i] != '\0'; i++)

       {

               if ( str[i] == ch )

                     countChar = countChar + 1;

       }

       return countChar;

}

int main()

{

      char str[] = "saad bin saulat";

cout << "s comes : " << CountCharacter( str , 's' ) << " times" << endl;

      cout << "a comes : " << CountCharacter( str , 'a' ) << " times" << endl;

      cout << "d comes : " << CountCharacter( str , 'd' ) << " times" << endl;

      cout << "b comes : " << CountCharacter( str , 'b' ) << " times" << endl;

      cout << "i comes : " << CountCharacter( str , 'i' ) << " times" << endl;

      cout << "n comes : " << CountCharacter( str , 'n' ) << " times" << endl;

      cout << "u comes : " << CountCharacter( str , 'u' ) << " times" << endl;

      cout << "l comes : " << CountCharacter( str , 'l' ) << " times" << endl;

      cout << "t comes : " << CountCharacter( str , 't' ) << " times" << endl;

       

       _getche();

       return 0;

}

Output

s comes : 2 times

a comes : 4 times

d comes : 1 times

b comes : 1 times

i comes : 1 times

n comes : 1 times

u comes : 1 times

l comes : 1 times

t comes : 1 times