In this article, we will learn about python program to multiply two float numbers with examples.

Getting Started

The task is to multiply two float numbers in python. For example,

If a = 1.1 and b = 2.2, then output is 2.42.

We can do so in multiple ways –

• Simple Approach
• Using User Input
• Using User Input(Command Line Arguments)
• Using Lambda
• Using Function

Simple Approach

• Define two variables, a1 and a2, and store float numbers in them.
• Multiply them using multiplication operator i.e. * operator.

 
a1 = 17.3
a2 = 7.1
 
result = a1 * a2  # Get product of two float numbers using * operator 
print("Result =", result)

Output:

 
Result = 122.83

Using User Input

• Use input() method to take input from user. Then, store entered value in a1 and a2 variables.
• Multiply a1 and a2 using * operator.

 
a1 = float(input("Enter a number"))
a2 = float(input("Enter another number"))
 
result = a1 * a2
print("Product of {0} and {1} is {2}" .format(a1, a2, result))

Output:

 
Enter a number
23.2
Enter another number
4.76
Product of 23.2 and 4.76 is 110.43199999999999

Using User Input (Command Line Arguments)

• Use sys.argv in sys module in python to read input from command line arguments.
• Convert them to float using float() method.
• Then, multiply them using multiplication operator i.e. * operator.

• Method 1

  a1, a2 = sys.argv[1:3] reads two values from command line and store them in a1 and a2 variables.

   
  import sys
  a1, a2 = sys.argv[1:3]
  print("Result:", float(a1) * float(a2))
  

  Output:

   
  Result: 5.8500000000000005
  

  Run above code with command line arguments as 1.3 and 4.5.

• Method 2

  Omit second parameter in sys.argv[1:3] if we want to read all values in command line arguments.

   
  import sys
  a1, a2 = sys.argv[1:]
  print("Result:", float(a1) * float(a2))
  

  Output:

   
  Result: 5.8500000000000005
  

Using Lambda

Lambda method can also be used to multiply two numbers in python as shown below –

 
if __name__ == "__main__" :
    a1 = 16.2
    a2 = 2.5
 
    # Multiply two float numbers
    multiply_twoNum = lambda a1, a2 : a1 * a2
    print("Result:", multiply_twoNum(a1, a2))

Output:

 
Result: 40.5

Using Function

If we want to define a function that returns product of two float numbers, it can be done as below –

 
def multiply(m1, m2):
    return m1 * m2
  
print("Result:", multiply(15.3, 28.2))

Output:

 
Result: 431.46000000000004

That’s how we can write python program to multiply two float numbers with examples.

Reference: Multiplication

Learn about more python examples at – https://tutorialwing.com/python-tutorial/