View Compilation Error

0_0_39174540_23107.cpp:8:49: error: stray '\243' in program
    8 |     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2) <a3><a1>= EOF)
      |                                                 ^~~~
0_0_39174540_23107.cpp:8:50: error: stray '\241' in program
    8 |     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2) <a3><a1>= EOF)
      |                                                     ^~~~
0_0_39174540_23107.cpp: In function 'int main()':
0_0_39174540_23107.cpp:8:16: error: lvalue required as left operand of assignment
    8 |     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2) ！= EOF)
      |           ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0_0_39174540_23107.cpp:10:26: error: 'sqrt' was not declared in this scope
   10 |         printf("%.2lf\n",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
      |                          ^~~~