View Compilation Error

0_0_35272274_8998.c: In function 'main':
0_0_35272274_8998.c:7:2: error: stray '\243' in program
  while((scanf("%d %d %d %d",&x1,&y1,&x2,&y2))！=-1)
  ^
0_0_35272274_8998.c:7:2: error: stray '\241' in program
0_0_35272274_8998.c:7:48: error: lvalue required as left operand of assignment
  while((scanf("%d %d %d %d",&x1,&y1,&x2,&y2))！=-1)
                                                ^