Introduction to C Programming - Exercise on Arrays

Sorting an Array

 
      #include<stdio.h>
	int main()
	{   
		int a[5] = { 3,1,2,4,5 };
		int i = 0, j = 0,n=5,temp;
		for (i = 0; i < n - 1; i++)
		{
			for (j = 0; j < n - 1 - i; j++)
			{
				if (a[j] > a[j + 1])
				{
					temp = a[j];
					a[j] = a[j + 1];
					a[j + 1] = temp;
				}

			}

			for (i = 0; i < n; i++)
			{
				printf("%d ", a[i]);
			}
		}
		system("pause");
		return 0;
	}

Output

Finding and Displaying only unique elements in an array

 
      #include<stdio.h>
	int main()
	{   
		int a[5] = { 1,1,2,2,3};
		int j = 0, i = 0,n=5;
		for (i = 0; i < n; i++)
		{
			if (a[i] != a[i + 1])
				j = j + 1;
			a[j] = a[i + 1];
		}
		
		for (i = 0; i < j; i++)
		{
			printf("%d", a[i]);
		}
		system("pause");
		return 0;
	}

Output

Reversing the contents of an array

 
      #include<stdio.h>
	int main()
	{   
		int a[5] = { 1,2,3,4,5};
		int j = 0, i = 0,n=5,temp=0;
		for (i = 0; i < n/2; i++)
		{
			temp = a[i];
			a[i] = a[n -i-1];
			a[n - i-1] = temp;
		}
		
		for (i = 0; i < n; i++)
		{
			printf("%d", a[i]);
		}
		system("pause");
		return 0;
	}

Output