printfon0101^1

This code will output "11" in octal format.

Explanation:

• 010 is an octal number which is equivalent to decimal 8
• <<1 is a left shift operator which shifts the bits of 8 by 1 position to the left, resulting in 16 in decimal.
• ^1 is a bitwise XOR operator which performs the XOR operation with the binary equivalent of decimal 1, i.e. 0001.
• The XOR operation between 16 (binary 10000) and 1 (binary 0001) results in 17 (binary 10001).
• Finally, %o is the format specifier for octal representation, which will output 21 in octal format (17 in decimal is equivalent to 021 in octal).
• Therefore, the output will be "11" in octal format