C Program to Remove Vowels from a String

June 29, 2023

Program to remove vowels

In this article we will learn how to code a Program to remove vowels ‘A’, ‘E’, ‘I’, ‘O’, ‘U’ are five vowels out of 26 characters in English alphabet letters.C programming is case sensitive, and hence lowercase and uppercase characters are considered differently, so we will have to check for both the cases and then we can remove the vowels from a string

Program to remove vowels

Objective

Write a program that will take one string as input the program will then remove vowels a e i o u.

C Program to Remove Vowels from a String

Algorithm:

  • Initialize the variables.
  • Accept the input.
  • Initialize for loop.
  • Check and delete the vowels.
  • Store the string without vowels using another for loop.
  • Terminate both for loop.
  • Print the string without vowels.
Run 
#include <stdio.h>
#include <stdlib.h>

int main() {
    // Initializing variable.
    char str[100];
    int i, j, len = 0;

    // Accepting input.
    printf("Enter a string : ");
    // gets(str);
    scanf("%s", str);

    len = strlen(str);
    // Accepting input.

    for (i = 0; i < len; i++) {
        // Checking vowels.
        if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' || str[i] == 'u' ||
            str[i] == 'A' || str[i] == 'E' || str[i] == 'I' || str[i] == 'O' || str[i] == 'U') {
            // Deleting vowels.
            for (j = i; j < len; j++) {
                // Storing string without vowels.
                str[j] = str[j + 1];
            }
            i--;
            len--;
        }
        str[len + 1] = '\0';
    }
   printf("After deleting the vowels, the string will be : %s", str);
   return 0;
}

Output 

Enter a string : aaabbbeeeccc

After deleting the vowels, the string will be : bbbccc

Method 2​ C programming code to remove vowels from a string

Objective: Write a program that will take one string as input. the program will then remove vowels a e i o u

Here we have used pointers to solve the same problem 

Run 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int find_vowel(char ch) 
{    
    if (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || 
        ch == 'i' || ch == 'I' || ch == 'o' ||
        ch == 'O' || ch == 'u' || ch == 'U')
        return 1;  // It is a vowel
    else
        return 0;  // It is not a vowel
}
int main() {
    char *string, *temp, *strptr, ch, *start;
    int size = 100;

    printf("Enter a string");
    string = (char *)malloc(size);
    getline(&string, &size, stdin);
    temp = string;
    strptr = (char *)malloc(100);
    start = strptr;

    while (*temp) {
        ch = *temp;
        if (!find_vowel(ch)) {
            *strptr = ch;
            strptr++;
        }
        temp++;
    }

    *strptr = '\0';
    strptr = start;

    strcpy(string, strptr);
    free(strptr);

    printf("String after removing vowels: %s", string);
    return 0;

}

Output

Enter a string
Root
String after removing vowels: Rt
 
 

Toggle each character in a string

Count the number of vowels

Length of the string without using strlen() function

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One comment on “C Program to Remove Vowels from a String”


  • Argha

    #include
    #include
    int main()
    {
    //Initializing variable.
    char str[100];
    int i,j,len=0;

    //Accepting input.
    printf(“Enter a string : “);
    gets(str);
    len=strlen(str);

    //Accepting input.
    for(i=0; i<len; i++)
    {
    //Checking vowels.
    if(str[i]=='a'||str[i]=='e'||str[i]=='i'||str[i]=='o'||str[i]=='u'||str[i]=='A'||str[i]=='E'||str[i]=='I'||str[i]=='O'||str[i]=='U')
    {

    //Deleting vowels.
    for(j=i; j<len; j++)
    {
    //Storing string without vowels.
    str[j]=str[j+1];
    }
    len–;
    i–;
    }
    }
    printf("After deleting the vowels, the string will be : %s",str);

    return 0;
    }

    If you dont write i– where i have written if there is consecutive vowels in a string it will skip the second vowel plz rectify it

    10