C Program to Count Alphabets Digits Special characters in a string

C – Strings : 

Strings are actually one-dimensional array of characters terminated by a null character ‘\0’. Thus a null-terminated string contains the characters that comprise the string followed by a null.

String is a sequence of characters. char data type is used to represent one single character in C. So if you want to use a string in your program then you can use an array of characters.

The declaration and definition of the string using an array of chars is similar to declaration and definition of an array of any other data type.

Any string ends with a terminating null character ‘\0’. An array definition in such a way should include null character ‘\0’ as the last element.

Here is source code of the C Program to Count Alphabets Digits Special characters in a string. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

SOURCE CODE : :

/*  C Program to Count Alphabets Digits Special characters in a string  */

#include <stdio.h>

#define MAX_SIZE 100 //Maximum size of the string


int main()
{
    char string[MAX_SIZE];
    int alphabets, digits, others, i;

    alphabets = digits = others = i = 0;


    /* Reads a string from user */
    printf("\nEnter any string : ");
    gets(string);

    /*
     * Checks each character of string
     */
    while(string[i]!='\0')
    {
        if((string[i]>='a' && string[i]<='z') || (string[i]>='A' && string[i]<='Z'))
        {
            alphabets++;
        }
        else if(string[i]>='0' && string[i]<='9')
        {
            digits++;
        }
        else
        {
            others++;
        }

        i++;
    }

    printf("\nAlphabets = [ %d ]\n", alphabets);
    printf("\nDigits = [ %d ]\n", digits);
    printf("\nSpecial characters = [ %d ]\n", others);

    return 0;
}

OUTPUT : :

/*  C Program to Count Alphabets Digits Special characters in a string  */

Enter any string : Hello www.codezclub.com

Alphabets = [ 20 ]

Digits = [ 0 ]

Special characters = [ 3 ]

Process returned 0

Above is the source code for C Program to Count Alphabets Digits Special characters in a string which is successfully compiled and run on Windows System.The Output of the program is shown above .