# C Program for Selection Sort

• Difficulty Level : Easy
• Last Updated : 23 Feb, 2021

The selection sort algorithm sorts an array by repeatedly finding the minimum element (considering ascending order) from unsorted part and putting it at the beginning. The algorithm maintains two subarrays in a given array.
1) The subarray which is already sorted.
2) Remaining subarray which is unsorted.
In every iteration of selection sort, the minimum element (considering ascending order) from the unsorted subarray is picked and moved to the sorted subarray.

## C

 `// C program for implementation of selection sort``#include ` `void` `swap(``int` `*xp, ``int` `*yp)``{``    ``int` `temp = *xp;``    ``*xp = *yp;``    ``*yp = temp;``}` `void` `selectionSort(``int` `arr[], ``int` `n)``{``    ``int` `i, j, min_idx;` `    ``// One by one move boundary of unsorted subarray``    ``for` `(i = 0; i < n-1; i++)``    ``{``        ``// Find the minimum element in unsorted array``        ``min_idx = i;``        ``for` `(j = i+1; j < n; j++)``          ``if` `(arr[j] < arr[min_idx])``            ``min_idx = j;` `        ``// Swap the found minimum element with the first element``        ``swap(&arr[min_idx], &arr[i]);``    ``}``}` `/* Function to print an array */``void` `printArray(``int` `arr[], ``int` `size)``{``    ``int` `i;``    ``for` `(i=0; i < size; i++)``        ``printf``(``"%d "``, arr[i]);``    ``printf``(``"\n"``);``}` `// Driver program to test above functions``int` `main()``{``    ``int` `arr[] = {64, 25, 12, 22, 11};``    ``int` `n = ``sizeof``(arr)/``sizeof``(arr[0]);``    ``selectionSort(arr, n);``    ``printf``(``"Sorted array: \n"``);``    ``printArray(arr, n);``    ``return` `0;``}`

Output:

```Sorted array:
11 12 22 25 64 ```

Time Complexity: O(N2)

Auxiliary Space: O(1)

Please refer complete article on Selection Sort for more details.

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