Question

What is the result of 2^7 in Java? Why does it give this result?

Answer 1

Answer: 5

^(bitwise XOR operator)

• ^ is used as bitwise XOR operator in java
• ^ returns 1 if both operand values are different and return 0 if both operand values are equal

A	B	A^B
0	0	0
1	0	1
0	1	1
1	1	0

• 8 bit binary form of 2 is 00000010
• 8 bit binary form of 7 is 00000111
• Perform XOR operation bitwise on 00000010 and 00000111
• 00000010 ^
• 00000111
• 00000101 which is the binary equivalent of 5 (1x2²+0x2¹+1x2⁰ = 4+0+1=5)
• So 2^7 produce result 5