/in/foo.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main()
 ^~~~
/in/foo.c: In function 'main':
/in/foo.c:5:16: error: stray '\357' in program
  scanf("%d%d%d"，&a,&b,&c);
                ^
/in/foo.c:5:17: error: stray '\274' in program
  scanf("%d%d%d"，&a,&b,&c);
                 ^
/in/foo.c:5:18: error: stray '\214' in program
  scanf("%d%d%d"，&a,&b,&c);
                  ^
/in/foo.c:5:19: error: invalid operands to binary & (have 'char *' and 'int')
  scanf("%d%d%d"，&a,&b,&c);
        ~~~~~~~~   ^