What is type ComplexType in Golang?

The ComplexType type in Golang

The ComplexType type in Golang documentation is a placeholder for two complex number data types:

  • complex64
  • complex128

Both these data types take 2 floating point literals, one for the real part and one for the imaginary part. complex64 takes 2 float32 literals, whereas complex128 takes 2 float64 literals.

Example usage of the ComplexType type

The following code demonstrates the use of ComplexType:

package main
import "fmt"
func main() {
  var a complex64 = complex(1, 2)
  var b complex64 = 2 + 4i
  var c complex64 = b - a
  
  fmt.Println(a)
  fmt.Println(b)
  fmt.Println(c)
}

In the example above, the variables a, b, and c are of complex64 type (which is a ComplexType). The variable a is created using a built-in complex function which has the following syntax:

func complex(real, imaginary FloatType) ComplexType

The above function takes in 2 floating point numbers (real and imaginary parts) and returns the complex number.

The variable b is created by writing 2 + 4i, just like how you write complex numbers in math. The variable c is created by subtracting a from b, which results in 1 + 2i.

Note: Two variables, one with complex64 type and the other with complex128 type, cannot be arithmetically compared with each other.

Free Resources

Copyright ©2026 Educative, Inc. All rights reserved