C Program to Remove All Characters in a String Except Alphabets

C program to remove all characters in a string except alphabets; Through this tutorial, we will learn how to remove all characters in a string except alphabets using for loop and while loop in c programs.

Programs and Algorithm to Remove All Characters in a String Except Alphabets in C

Let’s use the following algorithm and programs to remove all characters in a string except alphabets using for loop and while loop in c:

• Algorithm to Remove All Characters in a String Except Alphabets
• C Program to Remove All Characters in a String Except Alphabets using For Loop
• C Program to Remove All Characters in a String Except Alphabets using For and While Loop

Algorithm to Remove All Characters in a String Except Alphabets

Use the following algorithm to write a program to remove all characters in a string except alphabets; as follows:

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

C Program to Remove All Characters in a String Except Alphabets using For Loop

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

int main()
{
  char strAlphas[100];

  printf("Enter A String to Remove Non-Alphabets = ");
  fgets(strAlphas, sizeof strAlphas, stdin);

  int len = strlen(strAlphas);

  for (int i = 0; i < len; i++)
  {
    if (!(strAlphas[i] >= 'a' && strAlphas[i] <= 'z') || (strAlphas[i] >= 'A' && strAlphas[i] <= 'Z'))
    {
      for (int j = i; j < len; j++)
      {
        strAlphas[j] = strAlphas[j + 1];
      }
      len--;
      i--;
    }
  }

  printf("The Final String after Sorting Alphabetically = %s\n", strAlphas);
}

The output of the above c program; as follows:

Enter A String to Remove Non-Alphabets = hello@123
The Final String after Sorting Alphabetically = hello

C Program to Remove All Characters in a String Except Alphabets using For and While Loop

#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;
}

The output of the above c program; as follows:

Enter a string : hello@123
After removing non alphabetical characters the string is :hello

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