In this tutorial, i am going to show you how to remove all duplicate characters in a string with the help of for loop, while loop and function in c programs.
All C Programs and Algorithm to Remove All Duplicate Characters From String
- Algorithm to Remove All Duplicate Characters in a String
- C Program to Remove All Duplicate Characters in a String using For Loop
- C Program to Remove All Duplicate Characters in a String using While Loop
- C Program to Remove All Duplicate Characters in a String using Function
Algorithm to Remove All Duplicate Characters in a String
Follow the below given algorithm to write a program to remove the duplicate character from a string; as follows:
- Start program.
- Take input string from user, store it in some variable.
- Find and remove all repeated characters of the given string.
- Print result
- End program
C Program to Remove All Duplicate Characters in a String using For Loop
/* C Program to Remove All Duplicate Character in a String */
#include <stdio.h>
#include <string.h>
int main()
{
char str[100];
int i, j, k;
printf("\n Please Enter any String : ");
gets(str);
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];
}
}
}
}
printf("\n The Final String after Removing All Duplicates = %s ", str);
return 0;
}
The result of the above c program; as follows:
The Final String after Removing All Duplicates = welcom t prgaminus
C Program to Remove All Duplicate Characters in a String using While Loop
/* C Program to Remove All Duplicate Character in a String */
#include <stdio.h>
#include <string.h>
int main()
{
char str[100];
int i, j, k;
i = 0;
printf("\n Please Enter any String : ");
gets(str);
while(i < strlen(str))
{
j = i + 1;
while(str[j] != '\0')
{
if(str[j] == str[i])
{
k = j;
while(str[k] != '\0')
{
str[k] = str[k + 1];
k++;
}
}
j++;
}
i++;
}
printf("\n The Final String after Removing All Duplicates = %s ", str);
return 0;
}
The result of the above c program; as follows:
Please Enter any String : c programmer The Final String after Removing All Duplicates = c progame
C Program to Remove All Duplicate Characters in a String using Function
/* C Program to Remove All Duplicate Character in a String */
#include <stdio.h>
#include <string.h>
void Remove_AllOccurrence(char *str);
int main()
{
char str[100];
printf("\n Please Enter any String : ");
gets(str);
Remove_AllOccurrence(str);
printf("\n The Final String after Removing All Duplicates = %s ", str);
return 0;
}
void Remove_AllOccurrence(char *str)
{
int i, j, k;
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];
}
}
}
}
}
The result of the above c program; as follows:
Please Enter any String : c programmer The Final String after Removing All Duplicates = c progame