Examples of C part 35 arrange 0 to left side and 1 to right side in array

Program:

Case 1:

#include<stdio.h>
#include<stdlib.h>
main()
{
 int i,size,j,zerosCount=0;
 printf("Enter Size of Array\n");
 scanf("%d",&size);
 int a[size];
 printf("Enter 1's and 0's only\n");
 for(i=0;i<size;i++)
 {
  scanf("%d",&a[i]);
  if(!(a[i]==0 || a[i]==1))
  {
   printf("Please Enter either 0 or 1\n");
   exit(0);
  }
 }
 for(i=0;i<size;i++)
 {
  if(a[i]==0)
  {
   zerosCount++;
  }
 }
 for(i=0;i<size;i++)
 {
  if(i<zerosCount)
      a[i]=0;
  else
      a[i]=1;
 }
 for(i=0;i<size;i++)
 {
  printf("%d",a[i]);
 }
 printf("\n");
}

Case 2:

#include<stdio.h>
#include<stdlib.h>
main()
{
 int i,size,temp,j,left,right;
 printf("Enter Size of Array\n");
 scanf("%d",&size);
 int a[size];
 printf("Enter 1's and 0's only\n");
 for(i=0;i<size;i++)
 {
  scanf("%d",&a[i]);
  if(!(a[i]==0 || a[i]==1))
  {
   printf("Please Enter either 0 or 1\n");
   exit(0);
  }
 }
 left=0;
 right=size-1;
 while(left<right)
 {
  while(a[left]==0 && left<right)
  {
   left++;
  }
   while(a[right]==1 && left<right)
  {
   right--;
  }
  if (left < right)
        {
            a[left] = 0;
            a[right] = 1;
            left++;
            right--;
        }
 }
 for(i=0;i<size;i++)
 {
  printf("%d",a[i]);
 }
 printf("\n");
}

Case 3:

#include<stdio.h>
#include<stdlib.h>
main()
{
 int i,size,temp,j;
 printf("Enter Size of Array\n");
 scanf("%d",&size);
 int a[size];
 printf("Enter 1's and 0's only\n");
 for(i=0;i<size;i++)
 {
  scanf("%d",&a[i]);
  if(!(a[i]==0 || a[i]==1))
  {
   printf("Please Enter either 0 or 1\n");
   exit(0);
  }
 }
 for(i=0;i<size;i++)
 {
  for(j=i+1;j<size;j++)
  {
   if(a[i]>a[j])
   {
    temp=a[i];
    a[i]=a[j];
    a[j]=temp;
   }
  }
 }
 for(i=0;i<size;i++)
 {
  printf("%d",a[i]);
 }
 printf("\n");
}

Output:

Enter Size of Array
10
Enter 1's and 0's only
0
1
1
1
0
1
0
1
1
0
0000111111
       

Explanation:
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