/in/foo.cc:5:6: error: stray '\357' in program
 int a，sum=0;
      ^
/in/foo.cc:5:7: error: stray '\274' in program
 int a，sum=0;
       ^
/in/foo.cc:5:8: error: stray '\214' in program
 int a，sum=0;
        ^
/in/foo.cc:7:4: error: stray '\357' in program
 for（int i=1;i<=a;i++）
    ^
/in/foo.cc:7:5: error: stray '\274' in program
 for（int i=1;i<=a;i++）
     ^
/in/foo.cc:7:6: error: stray '\210' in program
 for（int i=1;i<=a;i++）
      ^
/in/foo.cc:7:23: error: stray '\357' in program
 for（int i=1;i<=a;i++）
                       ^
/in/foo.cc:7:24: error: stray '\274' in program
 for（int i=1;i<=a;i++）
                        ^
/in/foo.cc:7:25: error: stray '\211' in program
 for（int i=1;i<=a;i++）
                         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:5:9: error: expected initializer before 'sum'
 int a，sum=0;
         ^~~
/in/foo.cc:6:6: error: 'a' was not declared in this scope
 cin>>a;
      ^
/in/foo.cc:7:7: error: expected '(' before 'int'
 for（int i=1;i<=a;i++）
       ^~~
/in/foo.cc:8:1: error: expected ')' before '{' token
 {
 ^
/in/foo.cc:9:4: error: 'sum' was not declared in this scope
    sum+=i;
    ^~~
/in/foo.cc:11:7: error: 'sum' was not declared in this scope
 cout<<sum<<endl;
       ^~~