Count Vowels, Consonants, Digits, Spaces Dry Run in C

Count Vowels, Consonants, Digits, Spaces is an interactive C dry run visualizer from the Strings programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

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Count Vowels, Consonants, Digits, Spaces Program Code

#include <stdio.h>
#include <ctype.h>
int main() {
    char str[] = "Hello World 2025!";
    int vowels = 0, consonants = 0, digits = 0, spaces = 0;
    int i = 0;
    
    while(str[i] != '\0') {
        char ch = tolower(str[i]);
        
        if(ch >= 'a' && ch <= 'z') {
            if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
                vowels++;
            else
                consonants++;
        }
        else if(ch >= '0' && ch <= '9')
            digits++;
        else if(str[i] == ' ')
            spaces++;
        
        i++;
    }
    
    printf("Vowels: %d\n", vowels);
    printf("Consonants: %d\n", consonants);
    printf("Digits: %d\n", digits);
    printf("Spaces: %d\n", spaces);
    
    return 0;
}

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