C Exercises: Sort an array of 0s, 1s and 2s
C Array: Exercise-54 with Solution
Write a program in C to sort an array of 0s, 1s and 2s.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
void changePlace(int arr1[], int i, int j)
{
int tmp = arr1[i];
arr1[i] = arr1[j];
arr1[j] = tmp;
}
int sortElements(int arr1[], int end)
{
int start = 0, mid = 0;
int pivot = 1;
while (mid <= end)
{
if (arr1[mid] < pivot)
{
changePlace(arr1, start, mid);
++start, ++mid;
}
else if (arr1[mid] > pivot)
{
changePlace(arr1, mid, end);
--end;
}
else
{
++mid;
}
}
}
int main()
{
int arr1[] = { 0, 1, 2, 2, 1, 0, 0, 2, 0, 1, 1, 0 };
int n = sizeof(arr1)/sizeof(arr1[0]);
int i;
//------------- print original array ------------------
printf("The given array is : ");
for(i = 0; i < n; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
printf("After sortig the elements in the array are: \n");
sortElements(arr1, n - 1);
for (int i = 0 ; i < n; i++)
{
printf("%d ", arr1[i]);
}
return 0;
}
Sample Output:
The given array is : 0 1 2 2 1 0 0 2 0 1 1 0 After sortig the elements in the array are: 0 0 0 0 0 1 1 1 1 2 2 2
Flowchart:

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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
Ref : https://bit.ly/3dIwfkP
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