In C programming, a string is a one-dimensional array of characters that ends with the special character ‘\0’. Character arrays or strings are used to manipulate text, such as words or sentences. In strings, the termination character (‘\0’) is very important because it is the only way to detect where the string ends. Strings can be written as character arrays or string literals in the C language. The most commonly used string functions are strlen(), strcmp(), strcpy(), strchr(), and strcat().
The following section contains various C programs related to strings, string operations, string functions, palindrome programs, string programs using recursion, frequency, and occurrence of characters in a string. C programs on string matching, approximate string matching, and encryption algorithms are also covered with examples. Each sample program on the linked list includes a program description, C code, and program output. All examples have been compiled and tested on Windows and Linux systems.
Here is the listing of C programming examples on Strings:
- C Programs on Palindome
- C Programs on String Operations
- C Programs on String Functions
- C Programs on Strings
- C Programs on Frequency of Characters in a String
- C Programs on Count Occurrences of a Character in a String
- C Programs on String using Recursion
- C Programs on String Matching
- C Programs on Cryptography
- C Programs on Longest Common SubString/SubSequence
1. C Programs on Palindome
| Program | Description |
|---|---|
| String Palindrome Program in C | C Program to Check if a Given String is Palindrome |
| Palindrome String using Recursion in C | C Program to Check whether a String is Palindrome or not using Recursion |
| Palindrome String without Built-in Function in C | C Program to Check if a String is a Palindrome without using Built-in Function |
| Smallest and Largest Palindrome in C | C Program to Find Smallest and Biggest Possible Word which is Palindrome in a String |
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2. C Programs on String Operations
| Program | Description |
|---|---|
| String Concatenation in C | C Program to Concatenate Two Strings |
| Concatenate Two Strings Lexically in C | C Program to Concatenate Two Strings Lexically |
| Compare Two Strings in C | C program to Compare Two Strings |
| Find Substring in a String in C | C Program to Check if the Substring is Present in the Given String |
| Length of a String without Built-in Function in C | C Program to Find the Length of a String Without using Built-in Function |
| Insert Character in String in C | C Program to Insert Character/Word in Any Desired Location in a String |
| Remove Duplicate Words from String in C | C Program to Delete All Repeated Words in String |
3. C Programs on String Functions
| Program | Description |
|---|---|
| Remove Word from String in C | C Program to Remove Given Word from a String |
| Remove Characters in Second String which are present in First String in C | C Program to Remove Characters in Second String which are present in First String |
| Replace all Characters by Lowercase in C | C Program to Replace All Characters by Lowercase |
| Capitalize First Letter of Each Word in a String in C | C Program to Capitalize First Letter of Each Word in String |
| Reverse Each Word in a String in C | C Program to Reverse Each Word in a String |
| Regular Expression Matching in C | C Program to Implement Regular Expression Matching |
| strpbrk() Function in C | C Program to Implement strpbrk() Function |
4. C Programs on Strings
| Program | Description |
|---|---|
| Sum of Numbers in String in C | C Program to Read a String and Find the Sum of all Digits in the String |
| Largest and Smallest Word in a String in C | Program to Find the Largest and Smallest Word in a String |
| Maximum Occurring Character in a String in C | C Program to Find the Most and Least Repeated Character in the String |
| Words Ending with Letter S in C | C Program to Print the Words Ending with Letter S |
| Permutation of a String in C | C Program to Print All Permutations of a Given String |
| List All Lines Containing a given String in C | C Program to List All Lines Containing a Given String |
| Check if Two Strings are Permutation of Each Other in C | C Program to Check if Two Strings are Permutation of Each Other |
| Anagram Program in C | C Program to Check whether Two Strings are Anagrams |
| Find Position of 1-bits in C | C Program to Find the Position of 1-bits |
| ASCII Value of a String in C | C Program to Print Ascii Value of All Characters in the String |
| Sum of ASCII Value of a String in C | C Program to Find the Sum of ASCII Value of All Characters in the String |
| Prime String Program in C | C Program to Display All Characters Present in the Prime Position of a String |
| C Program to Display All Combinations of Two Words from String without Repeated Combinations | C Program to Print All Possible Combination of Two Words from the String without any Repetition |
| Print Common Characters of Two Strings in C | C Program to Check Whether All Characters in First String is Present in Second String |
| Square String in C | C Program to Print the Square of all the Numbers in a String |
| Binary Addition of Strings in C | C Program to Add Two Binary Strings |
| Add Two Binary Strings in C | C Program to Input 2 Binary Strings and Print their Binary Sum |
| Convert Integer to String and Vice-versa in C | C Program to Convert Integer to String and Vice-versa |
| Grep, Egrep and Fgrep in C | C Program to Implement Grep, Egrep and Fgrep Commands |
5. C Programs on Frequency of Characters in a String
| Program | Description |
|---|---|
| Highest Frequency Character in a String in C | C Program to Find Highest Frequency Character in a String |
| Frequency of Each Word in a String in C | C Program to Find the Frequency of Each Word in a String |
| Frequency of “the” Word in a String in C | C Program to Find the Frequency of “the” Word in a String |
| Frequency of a Substring in a String in C | C Program to Find the Frequency of a Substring in a String |
| Find Frequency of Characters in a String in C | C Program to Find Frequency and Position of Characters in a String |
| Count Repeated Words from a String in C | C Program to Count Repeated Words from a String |
| Find all Subsets of a String in C | C Program to Find All Possible Subsets of a String |
| Find all Subsets of given Length in String in C | C Program to Find All Possible Subsets of Given Length in String |
6. C Programs on Count Occurrences of a Character in a String
| Program | Description |
|---|---|
| First and Last Occurrence of Character in a String in C | C Program to Find First and Last Occurrence of Character in a String |
| Find Consecutive Occurrence of Vowel in a String in C | C Program to Find Consecutive Occurrence of Vowel in a String |
| Find all Occurrences of a Substring in String in C | C Program to Count the Occurrence of a Substring in String |
| Count Particular Repeated Word in String in C | C Program to Count Particular Repeated Word in a String |
| Count Occurrence of Each Character in String in C | C Program to Count the Occurrence of Each Character in String |
| Count Number of Words from a String in C | C Program to Count Number of Words in a String |
| Count Unique Words from a String in C | C Program to Count Number of Unique Words in a String |
7. C Programs on String using Recursion
| Program | Description |
|---|---|
| First Uppercase Letter in a String using Recursion in C | C Program to Find the First Capital Letter in a String using Recursion |
| First Uppercase Letter in a String without Recursion in C | C Program to Find the First Capital Letter in a String without Recursion |
| String Length using Recursion in C | C Program to Find the Length of the String |
| String Copy using Recursion in C | C Program to Copy One String to Another using Recursion |
| Reverse a String using Recursion in C | C Program to Reverse a String using Recursion |
| Reverse a String using Recursion and Iteration in C | C Program to Reverse a String using Recursion and Iteration |
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8. C Programs on String Matching
| Program | Description |
|---|---|
| Naive String Matching in C | C Program to Perform Naive String Matching |
| Knuth Morris Pratt Algorithm in C for Pattern Searching | C Program to Implement Knuth-Morris-Pratt Algorithm for Pattern Searching |
| Knuth Morris Pratt Algorithm in C | C Program to Implement KMP Pattern Searching Algorithm |
| Boyer Moore Algorithm in C | C Program to Implement Boyer-Moore Algorithm for Pattern Searching |
| Rabin Karp String Matching Algorithm in C | C Program to Implement Rabin-Karp Method for Pattern Searching |
| Online String Matching using Wagner and Fisher in C | C Program to Implement Wagner and Fischer Algorithm for Online String Matching |
| Levenshtein Distance Computing Algorithm in C | C Program to Implement Levenshtein Distance Computing Algorithm |
| String Matching Using Library in C | C Program to Perform String Matching Using String Library |
| String Search Algorithm in C | C Program to Implement String Search Algorithm for Short Text Sizes |
| Repeated Search Pattern in C | C Program to Repeatedly Search the Same Text |
9. C Programs on Cryptography
| Program | Description |
|---|---|
| Monoalphabetic Cipher in C | C Program to Implement the Monoalphabetic Cipher |
| Caesar Cipher in C | C Program to Implement Caesar Cipher |
| Vigenere Cipher in C | C Program to Implement the Vigenere Cipher |
| Hill Cipher in C | C Program to Implement the Hill Cipher |
| Affine Cipher in C | C Program to Implement Affine Cipher |
| Playfair Cipher Encryption Program in C | C Program to Encrypt Message using Playfair Cipher |
| RSA Algorithm in C | C Program to Implement the RSA Algorithm |
| Transposition Technique Program in C | C Program to Perform Cryptography using Transposition Technique |
| Checksum Program in C | C Program to Implement the Checksum Method for Small String Messages |
10. C Programs on Longest Common SubString/SubSequence
| Program | Description |
|---|---|
| Longest Repeating Subsequence in C | C Program to Find Longer Repeating Sequence |
| Length of Longest Repeating Subsequence in C | C Program to Find the Length of Longest Repeating Subsequence |
| Longest Increasing Subsequence in C | C Program to Find the Longest Increasing Subsequence |
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