C Program to Extract Characters From a String

Last Updated : 19 Jul, 2022

Character extraction can be done by iterating through the string in the form of a character array. It basically means plucking out a certain amount of characters from an array or a string.

Now, to take input in C we do it by using the following methods:

scanf("%c",&str[i]); - Using a loop
scanf("%s",str); - Using %s format specifier
gets(str); - Gets gives us an extra ability to use space in an character string/array

Now the next step would be running the loop until we reach the null pointer, which exists in character arrays to indicate the end of the string. Being cautious, we will check for no blank space, if it is a valid character we print it using ("%c ",str[i]) else we will continue.

Example:

// C Program to demonstrate character  // extraction from a string #include <stdlib.h> #include <stdio.h> int main() {     char str[20];     printf("Enter the string: ");     gets(str);     // alternative scanf("%s",str);        // character extraction     printf("Printing the characters:: \n");     for (int i = 0; str[i] != '\0'; i++) {         if (str[i] != ' ') { // not a white space             printf("%c\n", str[i]); // printing each characters in a new line         }     }     return 0; }

Input:

GeeksforGeeks

Output:

Enter the string: GeeksforGeeks Printing the characters::  G e e k s f o r G e e k s

Time Complexity: O(n) where n is the size of the string.

Auxiliary Space: O(1)

C++ Program to Sort String of Characters

iamsuman898

Improve

Article Tags :

Practice Tags :

In C++, character arrays are used to store sequences of characters also known as strings. A substring is a part of a string that consists of a continuous sequence of characters from the string. In this article, we will learn how to extract a substring from a character array in C++. Extract a Substri

2 min read

C++ Program to Sort String of Characters

Sorting a string means rearranging the characters of the given string in some defined order such as alphabetical order. In this article, we will learn how to sort a string by characters in C++. Examples Input: str = "geeksforgeeks"Output: "eeeefggkkorss"Explanation: The characters in the string are

4 min read

How to Remove Last Character From C++ String?

In C++, strings are stored as the std::string class objects. In this article, we will look at how to remove the last character from this C++ string object. For Example, Input: Hello! GeeksOutput: Hello! GeekRemove the Last Character from a String in C++To remove the last character from a string, we

2 min read

Program to find the kth character after decrypting a string

Given a string str consisting of characters and numbers and an integer k, the task is to decrypt the string and the return the kth character in the decrypted string.In order to decrypt the string, traverse the string character by character and if the current character is an alphabet then append it t

8 min read

Convert character array to string in C++

This article shows how to convert a character array to a string in C++. The std::string in c++ has a lot of inbuilt functions which makes implementation much easier than handling a character array. Hence, it would often be easier to work if we convert a character array to string. Examples: Input: ch

4 min read

How to Convert a Single Character to String in C++?

A string is a generally made up of a sequence of multiple characters. In this article, we will learn how to convert a single character to a string in C++. Example: Input: c = 'A'Output: s = "a"Explanation: Character c is converted to a string. Input: c = '#'Output: s = "#"Explanation: Character c is

4 min read

Remove odd frequency characters from the string

Given string str of size N, the task is to remove all the characters from the string that have odd frequencies. Examples: Input: str = "geeksforgeeks" Output: geeksgeeks The characters f, o, r have odd frequencies So, they are removed from the string. Input: str = "zzzxxweeerr" Output: xxrr Approach

9 min read

C++ Program to Print the First Letter of Each Word of a String

String str is given which contains lowercase English letters and spaces. It may contain multiple spaces. Get the first letter of every word and return the result as a string. The result should not contain any space. Examples: Input: str = "geeks for geeks" Output: gfg Input: str = "happy coding" Out

4 min read

How to Read a File Character by Character in C++?

In C++, file handling is used to store data permanently in a computer. Using file handling we can store our data in secondary memory (Hard disk). In this article, we will learn how to read a file character by character in C++. Example: Input: "Geeks for Geeks"Output: G e e k s f o r G e e k sRead Te

2 min read

Extract and print words separately from a given Camel Case string

Given a string in Camel Case format, we need to extract all the words which are present in the string. CamelCase is the sequence of one or more than one words having the following properties: It is a concatenation of one or more words consisting of English letters.All letters in the first word are l

6 min read

C Program to Extract Characters From a String

Similar Reads