Algorithm

1. Start
2. Declare variables for vowels, consonants, digits, and white spaces, initialized to 0.
3. Input a string from the user.
4. Loop through each character in the string:
   a. Check if the character is a vowel (a, e, i, o, u or their uppercase versions).
      - If true, increment the vowel count.
   b. Check if the character is a consonant (alphabet character that is not a vowel).
      - If true, increment the consonant count.
   c. Check if the character is a digit (0-9).
      - If true, increment the digit count.
   d. Check if the character is a white space (space, tab, newline, etc.).
      - If true, increment the white space count.
5. Display the counts of vowels, consonants, digits, and white spaces.
6. En

Code Examples

#1 Code Example- C++ programing From a C-style string

Code - C++ Programming

#include <iostream>
using namespace std;

int main()
{
    char line[150];
    int vowels, consonants, digits, spaces;

    vowels =  consonants = digits = spaces = 0;

    cout << "Enter a line of string: ";
    cin.getline(line, 150);
    for(int i = 0; line[i]!='\0'; ++i)
    {
        if(line[i]=='a' || line[i]=='e' || line[i]=='i' ||
           line[i]=='o' || line[i]=='u' || line[i]=='A' ||
           line[i]=='E' || line[i]=='I' || line[i]=='O' ||
           line[i]=='U')
        {
            ++vowels;
        }
        else if((line[i]>='a'&& line[i]<='z') || (line[i]>='A'&& line[i]<='Z'))
        {
            ++consonants;
        }
        else if(line[i]>='0' && line[i]<='9')
        {
            ++digits;
        }
        else if (line[i]==' ')
        {
            ++spaces;
        }
    }

    cout << "Vowels: " << vowels << endl;
    cout << "Consonants: " << consonants << endl;
    cout << "Digits: " << digits << endl;
    cout << "White spaces: " << spaces << endl;

    return 0;
}
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Output

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Enter a line of string: This is 1 hell of a book.
Vowels: 7
Consonants: 10
Digits: 1
White spaces: 6

#2 Code Example- C++ Programing From a String Object

Code - C++ Programming

#include <iostream>
using namespace std;

int main()
{
    string line;
    int vowels, consonants, digits, spaces;

    vowels =  consonants = digits = spaces = 0;

    cout << "Enter a line of string: ";
    getline(cin, line);

    for(int i = 0; i  <  line.length(); ++i)
    {
        if(line[i]=='a' || line[i]=='e' || line[i]=='i' ||
           line[i]=='o' || line[i]=='u' || line[i]=='A' ||
           line[i]=='E' || line[i]=='I' || line[i]=='O' ||
           line[i]=='U')
        {
            ++vowels;
        }
        else if((line[i]>='a'&& line[i]<='z') || (line[i]>='A'&& line[i]<='Z'))
        {
            ++consonants;
        }
        else if(line[i]>='0' && line[i]<='9')
        {
            ++digits;
        }
        else if (line[i]==' ')
        {
            ++spaces;
        }
    }

    cout << "Vowels: " << vowels << endl;
    cout << "Consonants: " << consonants << endl;
    cout << "Digits: " << digits << endl;
    cout << "White spaces: " << spaces << endl;

    return 0;
}
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Output

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Enter a line of string: I have 2 C++ programming books.
Vowels: 8
Consonants: 14
Digits: 1
White spaces: 5
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Demonstration

C++ Programing Example to Find the Number of Vowels, Consonants, Digits and White Spaces in a String-DevsEnv