Write a C program to count the vowels in a string

Description: Take a word as input. Print how many vowels (a, e, i, o, u) it has.

Hint:

• Go through each character. Convert it to lower case, and check if it is one of the five vowels.

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C program to count the vowels

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

int main(void) {
    char s[50];
    int count = 0;

    printf("Enter a word: ");
    scanf("%49s", s);

    for (int i = 0; s[i] != '\0'; i++) {
        switch (tolower((unsigned char)s[i])) {
            case 'a': case 'e': case 'i': case 'o': case 'u':
                count++;
        }
    }
    printf("Vowels = %d\n", count);
    return 0;
}

Output:

How it works

• “Education” has the vowels E, u, a, i, o, so the answer is 5.
• tolower() makes the check work for capital letters also.

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