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Basic
Switch Case
Goto
Operators
if Statement
Nested if
While Loop
For Loop
Patterns
Array
2D Array
String Function Example
Pointers
Recursion Function
Structure
Excersises
Others



C Program to Count the Number of Vowels, Consonants, Digits, and Spaces


Write a C program that counts vowels, consonants, digits, and spaces in a given string:

  • Reads the input string one character at a time until a newline (\n) is encountered.
  • Checks and counts if the character is a vowel (a, e, i, o, u - both cases).
  • Checks and counts digits (characters between '0' and '9') and spaces (' ').
  • Counts consonants by checking if the character is an alphabet but not a vowel.
Example : pgm.c 
#include <stdio.h>

int main() {
    char str[200];
    int vowels = 0, consonants = 0, digits = 0, spaces = 0;
    int i = 0;
    char ch;

    printf("Enter a string: ");

    // Read character by character until newline
    while ((ch = getchar()) != '\n') {
        str[i] = ch;

        // Check for vowels
        if (ch == 'a' || ch == 'e' || ch == 'i' ||
            ch == 'o' || ch == 'u' || ch == 'A' ||
            ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') {
            vowels++;
        }
        // Check for digits
        else if (ch >= '0' && ch <= '9') {
            digits++;
        }
        // Check for spaces
        else if (ch == ' ') {
            spaces++;
        }
        // Check for consonants (alphabet characters excluding vowels)
        else if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
            consonants++;
        }

        i++;
    }

    printf("Vowels: %d\n", vowels);
    printf("Consonants: %d\n", consonants);
    printf("Digits: %d\n", digits);
    printf("Spaces: %d\n", spaces);

    return 0;
}

Output :

Enter a string: Welcome 2025
Vowels: 3
Consonants: 4
Digits: 4
Spaces: 1