/in/foo.c: In function 'main':
/in/foo.c:8:2: error: 'cin' undeclared (first use in this function)
  cin>>a>>b>>c;
  ^~~
/in/foo.c:8:2: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:20:8: error: stray '\357' in program
  if(b>c）
        ^
/in/foo.c:20:9: error: stray '\274' in program
  if(b>c）
         ^
/in/foo.c:20:10: error: stray '\211' in program
  if(b>c）
          ^
/in/foo.c:22:2: error: expected ')' before '{' token
  {
  ^
/in/foo.c:30:1: error: expected expression before '}' token
 }
 ^