`luc076.c`¶

Problem Statement

Write a program to count the number of occurrences of any two vowels in succession in a line of text.

Metadata¶

Property	Detail
Author	Amit Dutta amitdutta4255@gmail.com
Date	08 Feb 2026
License	MIT License (See the LICENSE file for details)
Difficulty	Beginner (index: 2 / 10)

Concepts¶

Beta Feature

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Recursion
Array
Iteration

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Source Code¶

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

int is_vowel(char c)
{
    c = tolower(c);
    return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
}

int main()
{
    char str[100];
    int i, count = 0;

    printf("Enter a line of text: ");
    gets(str);

    printf("Occurrences found:\n");
    for (i = 0; str[i] != '\0'; i++)
    {
        if (is_vowel(str[i]) && is_vowel(str[i+1]))
        {
            printf("'%c%c' ", str[i], str[i+1]);
            count++;
        }
    }

    printf("\n\nTotal number of successive vowels: %d\n", count);

    return 0;
}

Explanation¶

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (luc076.c):

    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <ctype.h>

    int is_vowel(char c)
    {
        c = tolower(c);
        return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
    }

    int main()
    {
        char str[100];
        int i, count = 0;

        printf("Enter a line of text: ");
        gets(str);

        printf("Occurrences found:\n");
        for (i = 0; str[i] != '\0'; i++)
        {
            if (is_vowel(str[i]) && is_vowel(str[i+1]))
            {
                printf("'%c%c' ", str[i], str[i+1]);
                count++;
            }
        }

        printf("\n\nTotal number of successive vowels: %d\n", count);

        return 0;
    }

luc076.c¶