# Sort an array in ascending order using sort() function in C++ STL

C++ STL - sort() function Example: In this article, we are going to learn how to sort array elements in Ascending Order using sort() function of C++ - STL?
Submitted by IncludeHelp, on January 03, 2018

Given an array and we have to sort the elements in Ascending Order using C++ STL sort() function.

## sort() function

It is a built-in function of algorithm header file it is used to sort the containers like array, vectors in specified order.

Syntax:

`sort(first, last);`

Here,
first - is the index (pointer) of first element from where we want to sort the elements.
last - is the last index (pointer) of last element.

For example, we want to sort elements of an array ‘arr’ from 1 to 5 position, we will use sort(arr, arr+5) and it will sort 5 elements in Ascending order.

Example:

```    Input:
Array: 10, 1, 20, 2, 30

Output:
Sorted Array: 1, 2, 10, 20, 30
```

C++ program:

```#include <iostream>
#include <algorithm>
using namespace std;

int main(){
//declare and define an array
int arr[]={10, 1, 20, 2, 30};

//size of the array
//total size/size of an element
int size = sizeof(arr)/sizeof(int);

//calling sort() to sort array elements
sort(arr, arr+5);

//printing sorted elements
cout<<"Sorted elements are: ";
for(int i=0; i<size; i++)
cout<<arr[i]<<" ";

return 0;
}
```

Output

```Sorted elements are: 1 2 10 20 30
```

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