View Compilation Error

0_0_23553801_3722.cpp:6:1: error: stray '\243' in program
 double pi=acos（-1.0）;
 ^
0_0_23553801_3722.cpp:6:1: error: stray '\250' in program
0_0_23553801_3722.cpp:6:1: error: stray '\243' in program
0_0_23553801_3722.cpp:6:1: error: stray '\251' in program
0_0_23553801_3722.cpp:6:18: error: invalid operands of types 'double(double)' and 'double' to binary 'operator-'
 double pi=acos（-1.0）;
                  ^