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## Numpy Array – Add a constant to all elements of the array

Adding a constant to a NumPy array is as easy as adding two numbers.

To add a constant to each and every element of an array, use addition arithmetic operator **+**. Pass array and constant as operands to the addition operator as shown below.

`output = arr + c`

where

**arr**is a numpy array.**c**is a constant.**output**is the resulting numpy array.

## Examples

### 1. Add a constant of 3 to each element in the array

In the following python example, we will add a constant **3** to an array **arr**. The resulting array is stored in **output** and print to the standard output.

**Python Program**

```
import numpy as np
#2D array
arr = (np.arange(8)*2).reshape(2,4)
#print array
print("The array\n", arr)
#adding a constant to all the elemnets of array
output = arr + 3
print("\nAfter adding a constant to all the elemnets of array\n", output)
```

Run Code Copy**Output**

## Summary

In this NumPy Tutorial, we learned how to add a constant to each of the element in numpy array using addition operator.

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