Python Program to Add Two Numbers Without using + Operator

We will develop a python program to add two numbers without using + operator. We will give two numbers num1 and num2. Python programs will add these numbers using the XOR operator and & operator. We can take the help of a function to add two numbers in python. A function is a block of code that performs a specific task.

Add Two Numbers in Python with User Input Without using + Operator

We will take two numbers while declaring the variables. Then, call the function and the sum of numbers will be displayed on the screen.

# Python program to add two numbers without using + operator

def add_num(a,b):   #user-defined function
   while b != 0:
      c = a & b   #using and operator
      a = a ^ b   #using XOR operator
      b = c << 1
   return a

# take inputs
num1 = 2
num2 = 7

# calling function
sum = add_num(num1, num2)

# print sum of numbers
print('The sum of numbers {0} and {1} is {2}'
                      .format(num1, num2, sum))

Output:-

The sum of numbers 2 and 7 is 9

In the previous program, inputs are hardcoded in the program but in this program, inputs will be provided by the user.

# Python program to add two numbers without using + operator

def add_num(a,b):   #user-defined function
   while b != 0:
      c = a & b   #using and operator
      a = a ^ b   #using XOR operator
      b = c << 1
   return a

# take inputs
num1 = int(input('Enter first number: '))
num2 = int(input('Enter second number: '))

# calling function
sum = add_num(num1, num2)

# print sum of numbers
print('The sum of numbers {0} and {1} is {2}'
                      .format(num1, num2, sum))

Output for the input values test-case-1:-

Enter first number: 12
Enter second number: 3
The sum of numbers 12 and 3 is 15

Output for the input values test-case-2:-

Enter first number: 98
Enter second number: 125
The sum of numbers 98 and 125 is 223

Python Program to Add Two Numbers Without using + Operator

This python program also performs the same task but in different ways. In this program, we add two numbers using -, *, and / operator.

# Python program to add two numbers without using + operator

def add_num(a,b):   #user-defined function
   if a!=b:
      return (a*a-b*b)/(a-b)
   else:
      return 2*a

# take inputs
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))

# calling function
sum = add_num(num1, num2)

# print sum of numbers
print('The sum of numbers {0} and {1} is {2}'
                      .format(num1, num2, sum))

Output for the input values test-case-1:-

Enter first number: 23
Enter second number: 9
The sum of numbers 23.0 and 9.0 is 32.0

Output for the input values test-case-2:-

Enter first number: 52.6
Enter second number: 25
The sum of numbers 52.6 and 25.0 is 77.6

Output for the input values test-case-3:-

Enter first number: 3.6
Enter second number: 0.91
The sum of numbers 3.6 and 0.91 is 4.51

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