/in/foo.c: In function 'aa':
/in/foo.c:5:2: error: stray '\357' in program
  int i = 1，a =2;
  ^
/in/foo.c:5:2: error: stray '\274' in program
/in/foo.c:5:2: error: stray '\214' in program
/in/foo.c:5:14: error: expected ',' or ';' before 'a'
  int i = 1，a =2;
              ^
/in/foo.c:9:10: error: 'a' undeclared (first use in this function)
    i = i*a%A;
          ^
/in/foo.c:9:10: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c: In function 'main':
/in/foo.c:19:2: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d\n", aa(b));
  ^