foo.cc: In function 'int main()':
foo.cc:12:9: error: 'if\U0000ff08c' was not declared in this scope
   12 |         if（c==0）
      |         ^~~~~
foo.cc:12:16: error: unable to find numeric literal operator 'operator""\U0000ff09'
   12 |         if（c==0）
      |                ^~~
foo.cc:12:16: note: use '-fext-numeric-literals' to enable more built-in suffixes
foo.cc:15:12: error: 'else' without a previous 'if'
   15 |            else
      |            ^~~~
foo.cc:17:9: error: 'else' without a previous 'if'
   17 |         else
      |         ^~~~
foo.cc:10:13: warning: unused variable 'c' [-Wunused-variable]
   10 |         int c=a%2;
      |             ^
foo.cc:11:13: warning: unused variable 'd' [-Wunused-variable]
   11 |         int d=b%2;
      |             ^

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