In this post I’m gonna share you one of the Array Sorting Program called “**Bubble Sort C program”.**

Do you know that is Bubble Sort?. If no, then let’s understand the Bubble Sort Algorithm first.

## What is Bubble Sort?

Bubble Sort is the simplest sorting algorithm that repeatedly swap the adjacent elements if they are in the wrong order.

- Here we are Swapping adjacent elements by using a temporary variable called temp.
- This algorithm is not suitable for large data sets as its time Complexity is average and worst case complexity are of Ο(n²) where n is the number of loops.
- Space Complexity of this Algorithm is O(1) because we don’t need extra space.

Lets have look below image to understand in better way:

## Bubble Sort in C

#include <stdio.h>

int main(){

int arr[100], r, i, n, temp, swap=0;

printf(“How Many Elements: “);

scanf(“%d“,&n);

for(i=0; i<n; i++){

printf(“Enter Element %d: “,i+1);

scanf(“%d“,&arr[i]);

}

printf(“\n“);

for(r=0; r<n–1; r++){

for(i=0; i<n–1–r; i++){

if(arr[i]>arr[i+1]){

temp=arr[i];

arr[i]=arr[i+1];

arr[i+1]=temp;

swap=1;

}

}

}

if(!swap){

printf(“List is already Sorted!\n“);

}

else{

printf(“After Sorting: “);

for(i=0; i<n; i++){

printf(“%d “,arr[i]);

}

printf(“\n“);

}

return 0;

}

**Output:**

How Many Elements: 8

Enter Element 1: 34

Enter Element 2: 23

Enter Element 3: 4

Enter Element 4: 7

Enter Element 5: 55

Enter Element 6: 12

Enter Element 7: 21

Enter Element 8: 43

After Sorting: 4 7 12 21 23 34 43 55

### How the above program will work?

1) The above program is about Array shorting technique called **Bubble Sort**.

2) In the Program first of all I’ve declared Array of size 100. that means the declared array can hold 100 items. We have declare some variables as well like:

**r**for number of rounds,**i**for number of iterations in each round,**n**for the total number of elements in array,**temp**for storing number temporarily for swapping,**swap**for feedback about the is done or not. Initial value is 0.

int arr[100], r, i, n, temp, swap=0;

3) After, the declaration statement, I’ve ask the user that **How may Elements **he/she want to enter in array, and store the answer in variable **n** that we have declare earlier.

printf(“How Many Elements: “);

scanf(“%d“,&n);

4) After that, we will have to take all the number on by one using for loop.

for(i=0; i<n; i++){

printf(“Enter Element %d: “,i+1);

scanf(“%d“,&arr[i]);

}

printf(“\n“);

5) After, taking each of the element and storing them into declared array, now the next steps is sorting the array using bubble sort approach.

In this step we have to use 2 for loop, one inside of another. The logic of for loops will be in the following manner:

- Outer for loop will be responsible for iteration of number of rounds, until
**r<n-1**. here**r**refers to the number of round, and**n-1**is refers to the total number of elements in the array. - Inner for loop will be responsible for the number of iterations in each round. As number rounds will increase, the number of iterations will decrease.
- In the If statement of the inner loop, we will swap the values of each pair of number, if
**arr[i]**is**greater than**the**arr[i+1],**here**arr[i]**refers to any particular number, and**arr[i+1]**refers to the next element of the**arr[i].** - If the condition is satisfied, we will store the First number (
**arr[i]**) into**temp**variable, and replace it with the Second variable (**arr[i+1]**). At last we**Replace**the second number with the value store in**temp**variable. - At last we will assign
**1**to**swap**variable.

for(r=0; r<n–1; r++){

for(i=0; i<n–1–r; i++){

if(arr[i]>arr[i+1]){

temp=arr[i];

arr[i]=arr[i+1];

arr[i+1]=temp;

swap=1;

}

}

}

6) After writing the main logic of the bubble sort, the next step is printing the sorted array if the sorting have been done. here we will use the following steps:

- First of all we use the if statement with the condition
**!swap**, which means if swap haven’t been done then print**List is already Sorted!**, else print array which have been sorted. - In the else, statement we have first print the message “
**After sorting:**” and then using for loop we have print the whole sorted array.

if(!swap){

printf(“List is already Sorted!\n“);

}

else{

printf(“After Sorting: “);

for(i=0; i<n; i++){

printf(“%d “,arr[i]);

}

printf(“\n“);

}

## Conclusion

In this post we have discussed about the **Bubble Sort Program in C **in easy to understand way.

In order to clear all the Basics of C Programming, you can visit my **C Programming Course for Free**.

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