View Compilation Error

0_0_15929834_21816.cpp:3:1: error: stray '\243' in program
 double a,b；
 ^
0_0_15929834_21816.cpp:3:1: error: stray '\273' in program
0_0_15929834_21816.cpp:6:1: error: stray '\250' in program
 b=–a；
 ^
0_0_15929834_21816.cpp:6:1: error: stray '\243' in program
0_0_15929834_21816.cpp:6:1: error: stray '\273' in program
0_0_15929834_21816.cpp:9:1: error: stray '\243' in program
 printf("%.2lf\n",b)；}}
 ^
0_0_15929834_21816.cpp:9:1: error: stray '\273' in program
0_0_15929834_21816.cpp: In function 'int main()':
0_0_15929834_21816.cpp:4:1: error: expected initializer before 'while'
 while(scanf("%lf",&a)!=EOF){
 ^