# complex() function with example in Python

Python complex() function: Here, we are going to learn about the complex() function in Python with example.
Submitted by IncludeHelp, on April 03, 2019

## Python complex() function

complex() function is a library function in Python, it is used to get the complex number from given a real number or/and an imaginary number (which is an optional part), it accepts either a real number only or read and an imaginary number and returns a complex number.

Syntax:

```    complex(real [,Imaginary])
```

Parameter(s):

• real – value of a real number
• Imaginary – an optional parameter, it's default value is 0.

Return value: complex – it returns a complex type of number containing the value in the form of (real + imaginary*j).

Example:

```    Input:
real = 10
img  = 20

print(complex(real))
print(complex(real, img))

Output:
(10+0j)
(10+20j)
```

Python code to get the complex number

```# python code to demonstrate example
# of complex() function

real = 10
img  = 20

# complex number  by passing real number
print(complex(real))

# complex number  by passing real & img. number
print(complex(real, img))

# complex number by passing real part as 0
print(complex(0))

# complex number by passing real and img. part as 0, 0
print(complex(0,0))

# with float values
real = 10.23
img  = 20.45

# complex number  by passing real number
print(complex(real))

# complex number  by passing real & img. number
print(complex(real, img))
```

Output

```(10+0j)
(10+20j)
0j
0j
(10.23+0j)
(10.23+20.45j)
```

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