foo.c: In function 'Sum':
foo.c:3:5: warning: type of 'x' defaults to 'int' [-Wimplicit-int]
 int Sum(x)       //定义Sum函数
     ^~~
foo.c:12:9: error: stray '\357' in program
  }while （x != 0）;
         ^
foo.c:12:10: error: stray '\274' in program
  }while （x != 0）;
          ^
foo.c:12:11: error: stray '\210' in program
  }while （x != 0）;
           ^
foo.c:12:12: error: expected '(' before 'x'
  }while （x != 0）;
            ^
foo.c:12:18: error: stray '\357' in program
  }while （x != 0）;
                  ^
foo.c:12:19: error: stray '\274' in program
  }while （x != 0）;
                   ^
foo.c:12:20: error: stray '\211' in program
  }while （x != 0）;
                    ^
foo.c: In function 'main':
foo.c:19:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a);
  ^~~~~~~~~~~~~~

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