View Compilation Error

0_0_27000430_2709.cpp: In function 'int main()':
0_0_27000430_2709.cpp:21:30: error: invalid operands of types 'double' and 'double' to binary 'operator^'
   if(a1 > b1) a1 ^= b1 ^= a1 ^= b1;
                              ^
0_0_27000430_2709.cpp:21:30: error:   in evaluation of 'operator^=(double, double)'
0_0_27000430_2709.cpp:22:30: error: invalid operands of types 'double' and 'double' to binary 'operator^'
   if(a2 > b2) a2 ^= b2 ^= a2 ^= b2;
                              ^
0_0_27000430_2709.cpp:22:30: error:   in evaluation of 'operator^=(double, double)'