58.C Program to Remove all Characters in a String Except Alphabet

C Program to Remove all Characters in a String Except Alphabet

This program takes a strings from user and removes all characters in that string except alphabets.

To understand this example, you should have the knowledge of following C programming topics:

• C Programming Arrays
• C Programming Strings
• C Programming for Loop
• C programming while and do...while Loop

Example: Remove Characters in String Except Alphabets

#include<stdio.h>

int main()
{
    char line[150];
    int i, j;
    printf("Enter a string: ");
    gets(line);

    for(i = 0; line[i] != '\0'; ++i)
    {
        while (!( (line[i] >= 'a' && line[i] <= 'z') || (line[i] >= 'A' && line[i] <= 'Z') || line[i] == '\0') )
        {
            for(j = i; line[j] != '\0'; ++j)
            {
                line[j] = line[j+1];
            }
            line[j] = '\0';
        }
    }
    printf("Output String: ");
    puts(line);
    return 0;
}

Output

Enter a string: p2'r-o@gram84iz./
Output String: programiz

This program takes a string from the user and stored in the variable line.

The, within the for loop, each character in the string is checked if it's an alphabet or not.

If any character inside a string is not a alphabet, all characters after it including the null character is shifted by 1 position to the left.

Check out these related examples:

• C Program to Read a Line From a File and Display it
• C Program to Find the Frequency of Characters in a String
• C program to count the number of vowels, consonants and so on