View Compilation Error

0_0_15929558_21320.cpp:7:1: error: stray '\250' in program
 b=–a
 ^
0_0_15929558_21320.cpp:9:1: error: stray '\243' in program
 b=a；
 ^
0_0_15929558_21320.cpp:9:1: error: stray '\273' in program
0_0_15929558_21320.cpp: In function 'int main()':
0_0_15929558_21320.cpp:7:4: error: 'Ca' was not declared in this scope
 b=–a
    ^