C Exercises: Remove the duplicates from a given array of integers
C Programming Practice: Exercise-12 with Solution
Write a C programming to remove the duplicates from a given array of integers.
C Code:
#include <stdio.h>
#include <stdlib.h>
static int remove_duplicates(int* nums, int arr_size)
{
if (arr_size <= 1) {
return arr_size;
}
int i = 0, j, count = 1;
while (i < arr_size) {
for (j = i + 1; j < arr_size && nums[i] == nums[j]; j++) {}
if (j < arr_size) {
nums[count++] = nums[j];
}
i = j;
}
return count;
}
int main(void)
{
int nums[] = {1,1,2,3,4,4,5,6,6,6};
int size = sizeof(nums)/sizeof(nums[0]);
printf("Original array:\n");
int i;
for (i = 0; i < size; i++) {
printf("%d ", nums[i]);
}
int count = remove_duplicates(nums, size);
printf("\nAfter removing duplicates from the above sorted array:\n");
for (i = 0; i < count; i++) {
printf("%d ", nums[i]);
}
printf("\n");
return 0;
}
Sample Output:
Original array: 1 1 2 3 4 4 5 6 6 6 After removing duplicates from the above sorted array: 1 2 3 4 5 6
Pictorial Presentation:
Flowchart:

C Programming Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a C programming to generate all combinations of well-formed parentheses from n given pairs of parentheses.
Next: Write a C program to remove all instances of a given value in a given array of integers and return the length of the new array.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
C Programming: Tips of the Day
Maximum value of int:
In C:
#include <limits.h> then use int imin = INT_MIN; // minimum value int imax = INT_MAX;
or
#include <float.h> float fmin = FLT_MIN; // minimum positive value double dmin = DBL_MIN; // minimum positive value float fmax = FLT_MAX; double dmax = DBL_MAX;
Ref : https://bit.ly/3fi8yk9
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework