C program to remove all characters from string except alphabets

October 13, 2022

Removing all characters from string except alphabets

In this article we will learn about Removing all characters from string except alphabets.

In the process to do this all the special characters (!,@,#,etc.) and numeric characters (1,2,3,etc.) need to removed from the string. 

  • Input:- 12Pre5pinst45a
  • Output:- prepinsta
Removing all characters from the string except alphabets

Algorithm:

  • Initialize the variables.
  • Accept the input.
  • Initialize a for loop.
  • Iterate each character through the loop.
  • Remove non alphabetical characters
  • Terminate for loop.
  • Print result.

 

While loop in C

C programming code to remove all characters from string except alphabets

Run 
#include <stdio.h>
int main()
{
    //Initializing variable.
    char str[100];
    int i, j;
    
     //Accepting input.
    printf(" Enter a string : ");
    gets(str);

     //Iterating each character and removing non alphabetical characters.
    for(i = 0; str[i] != '\0'; ++i)
    {
        while (!( (str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z') || str[i] == '\0') )
        {
            for(j = i; str[j] != '\0'; ++j)
            {
                str[j] = str[j+1];
            }
            str[j] = '\0'; 
        }
    }
     //Printing output.
    printf(" After removing non alphabetical characters the string is :");
    puts(str);
    return 0;
}
Output:
Enter a string : *1prep_insta*
After removing non alphabetical characters the string is :prepinsta
 
 

Toggle each character in a string

Count the number of vowels

Length of the string without using strlen() function

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While loop in C

One comment on “C program to remove all characters from string except alphabets”


  • Rohith

    #include
    #include
    int main()
    {
    int i,j=0,l;
    char str[100],cpy[100];
    printf(“string?”);
    scanf(“%s”,&str);
    l=strlen(str);
    for(i=0;i=’a’&&str[i]=’A’&&str[i]<='Z')
    { cpy[j]=str[i];
    j++;
    }
    }

    printf("%s",cpy);
    }