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Convert each binary string to a Python integer with base 2, add the values, then format the total in base 2. This short program accepts non-empty strings made only of 0 and 1 and prints the sum without a 0b prefix.
Python program to add two binary numbers
Use int(value, 2) to interpret each input as binary. Python’s + operator adds the resulting integers, and format(total, "b") converts the sum back to binary digits.
def add_binary(a: str, b: str) -> str:
if not a or not b or any(bit not in "01" for bit in a + b):
raise ValueError("Inputs must be non-empty binary strings")
total = int(a, 2) + int(b, 2)
return format(total, "b")
first = input("Enter the first binary number: ").strip()
second = input("Enter the second binary number: ").strip()
try:
print("Sum:", add_binary(first, second))
except ValueError as error:
print(error)Example
Enter 1011 and 1101. The program prints Sum: 11000: the inputs represent decimal 11 and 13, and their total, 24, is binary 11000.
Why the conversion works
A string such as 1011 is text, so it must be parsed with radix 2 rather than treated as a decimal number. The call int("1011", 2) produces the integer value 11. After adding the two integer values, format(total, "b") renders the result in base 2.
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#1 Best Overall
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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Python’s bin() can also convert a non-negative integer to binary, but it returns a prefix: the Python documentation defines it as converting an integer to “a binary string prefixed with ‘0b’.” For output containing only binary digits, format(total, "b") avoids that prefix. See the Python documentation for bin().
What inputs this program accepts
- Non-empty strings: empty input is rejected.
- Binary digits only: any character other than
0or1raises aValueError, which the command-line example displays. - Leading zeros: accepted, but they do not have to be preserved in the output. For example, adding
001and01returns10, not a padded result. - Signed values: this input contract does not accept a sign or negative binary values.
The strip() calls remove whitespace at the beginning or end of each input line before validation. The program does not silently delete invalid characters or try to reinterpret malformed input.
Rank #2
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
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When to use built-in conversion or manual carries
| Approach | Best suited to | How it works |
|---|---|---|
| Convert, add, format | A practical Python utility or a concise solution | Python parses the binary strings as integers, adds them, and formats the total in base 2. |
| Manual right-to-left carry | An exercise specifically about implementing binary arithmetic | Process digits from right to left, recording each output bit and carrying into the next column. |
The first approach uses Python’s integer arithmetic; Python documents integer range as limited by available memory. Choose the manual method when the learning objective is to understand carries or when you need to process digit strings directly rather than convert them into integer objects. No performance comparison is established here.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Input-safety note
Do not use eval() to parse binary input. It executes the supplied text as Python code rather than merely validating a number. Converting with int(text, 2) and checking the allowed characters gives the input a narrow, explicit meaning. See the Python Wiki discussion of eval.
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Quick Recap
Bestseller No. 5
Best Value
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
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Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
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