R18 Count vowels recursively Dry Run in C

R18 Count vowels recursively is an interactive C dry run visualizer from the Recursion 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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R18 Count vowels recursively Program Code

#include <stdio.h>

int isVowel(char ch) {
    ch = (ch >= 'A' && ch <= 'Z') ? ch + 32 : ch;
    return (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u');
}

int countVowels(char str[], int index) {
    if(str[index] == '\0') {
        return 0;
    }

    char currentChar = str[index];
    int countFromRest = countVowels(str, index + 1);
    int currentCount;

    if(isVowel(currentChar)) {
        currentCount = 1;
    } else {
        currentCount = 0;
    }

    int totalCount = currentCount + countFromRest;
    return totalCount;
}

int main() {
    char text[] = "Programming is Fun";
    int vowels = countVowels(text, 0);
    printf("String: %s\n", text);
    printf("Number of vowels: %d\n", vowels);
    return 0;
}

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