C compound assignment operator ^= mean [duplicate]

by

it’s XOR operator (exclusive OR op.):
will toggle (invert) the bit of an operand in position where any bit having value 1 in the other operand

 int ans = a[i]^1;

e.g. a 4 byte size, at an i:

a[i] = 00000000 0000000 1000000 1000001

  1  = 00000000 0000000 0000000 0000001 
      ---------------------------------- XOR
       00000000 0000000 1000000 1000000
                                      ^ --> 1st bit of a[i] get toggled

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