In this tutorial you will learn about the C Program to Remove All Duplicate Characters in a String and its application with practical example.
C Program to Remove All Duplicate Characters in a String
In this tutorial, we will learn to create a C program that will Remove All Duplicate Characters in a String in C programming
Prerequisites
Before starting with this tutorial we assume that you are best aware of the following C programming topics:
- Operators in C Programming.
- Basic Input and Output function in C Programming.
- Basic C programming.
- For loop in C programming.
- Conditional Statements in C programming.
What is a string?
As we all know the String is a collection of characters and words. The word is a collection of alphabets. For string, only one variable is declared which can store multiple values. The String can consist of all the typeable data it means Digits, Alphabets, Symbols, etc.
Algorithm:-
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1. Declaring the variables for the program. 2. Taking the input string from the user. 3. Finding the characters in string. 4. Passing those variables to for loop. 5. Using conditional statements for the program to removing the Last occerence character. 6. Printing the result string. 7. End the program. |
Removing All Duplicate Characters in a String
In this program first, we will take input strings from the user. Then we will find the length of the string. Then we will remove All the duplicate characters from that string. Printing the result string.
Let us take the example program from the below code for Removing All Duplicate Characters in a String.
Program Code:-
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/* ** C Program to Remove All Duplicate Characters in a String ** */ #include <stdio.h> #include <string.h> int main() { //Declaring the required variable for the program. char str[100]; int i, j, k; //taking the input from the user. printf("\n Please Enter any String : "); gets(str); //Removing the dublicate characters for(i = 0; i < strlen(str); i++) { for(j = i + 1; str[j] != '\0'; j++) { if(str[j] == str[i]) { for(k = j; str[k] != '\0'; k++) { str[k] = str[k + 1]; } } } } //Printing the output characters printf("\n The Final String after Removing All Duplicates = %s ", str); return 0; } |
Output:-
In the above program, we have Last initialized the required variable.
- str[100] = it will hold the string value.
- j = it will hold the integer value.
- k = it will hold the integer value.
- i = it will hold the integer value.
Input string from the user for the program.
Removing duplicate characters from the string.
Printing output String.
