C PROGRAMMING PROGRAM • SWITCH & MENU PROGRAMS

Check a Vowel Using switch

Learn how to check a vowel using switch using a clear C program.

BeginnerswitchCharacter casestolower()

PROBLEM UNDERSTANDING

Input and expected output

Sample input

Sample output

The character is a vowel.

COMPLETE C PROGRAM

Complete C implementation

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

int main(void)
{
    char character;
    printf("Enter an alphabet: ");
    scanf(" %c", &character);
    switch (tolower((unsigned char) character)) {
        case 'a': case 'e': case 'i': case 'o': case 'u':
            puts("The character is a vowel.");
            break;
        default:
            puts("The character is not a vowel.");
    }
    return 0;
}

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

No line selected

EXPECTED OUTPUT FOR THE SAMPLE

The character is a vowel.

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Normalize the letter to lowercase and group all five vowel cases.
Display the computed result.

Normalize the letter to lowercase and group all five vowel cases.

EFFICIENCY

Time and space complexity

Time complexity

O(1)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

Use the correct format specifier for every variable.

Check this

Initialize variables before using their values.

Check this

Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.