In this article, we will learn about python program to add two numbers with or without user input.

Getting Started

The task is to find sum of two numbers. For example,

If numbers are 10 and 20, output will be 10 + 20 = 30.

We can do so in multiple ways –

• Simple Approach
• When User Input is Provided
• Using Lambda
• Using Function

Simple Approach

 
a = 10
b = 20

sum = a + b
print("sum = ", sum)

Output:

 
sum =  30

In above program,
a + b returns sum of two numbers a and b.

When User Input is Given

 
a = float(input("Enter a number"))
b = float(input("Enter another number"))

sum = a + b
print("sum of {0} and {1} is {2}" .format(a, b, sum))

Output:

 
Enter a number
10
Enter another number
20
sum of 10.0 and 20.0 is 30.0

In above program,

• float(input()) takes input from user and converts it into float number.
• sum = a + b adds two number and store the result in variable sum.
• Then, result is printed using print() method

Using Lambda

 
if __name__ == "__main__" :
    num1 = 15
    num2 = 12
    
    # Adding two numbers
    sum_twoNum = lambda num1, num2 : num1 + num2
    print("sum = ", sum_twoNum(num1, num2))

Output:

 
sum =  27

Using Function

 
def findSum(a, b):
    return a + b

print("sum = ", findSum(10, 20))

Output:

 
sum =  30

That’s how can write python program to add two numbers with or without user input.

Reference: Official Doc