foo.c: In function 'main':
foo.c:6:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'c\U0000ff1da\U0000ff0bb'
    6 |                 c＝a＋b;
      |                 ^~~~~~~
foo.c:9:23: error: 'c' undeclared (first use in this function)
    9 |         printf("%d\n",c);
      |                       ^
foo.c:9:23: note: each undeclared identifier is reported only once for each function it appears in

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