foo.c: In function 'main':
foo.c:3:2: error: 'unsighed' undeclared (first use in this function)
    3 | {unsighed char i,j;
      |  ^~~~~~~~
foo.c:3:2: note: each undeclared identifier is reported only once for each function it appears in
foo.c:3:10: error: expected ';' before 'char'
    3 | {unsighed char i,j;
      |          ^~~~~
      |          ;
foo.c:4:30: error: expected ';' before '\U0000ff1b'
    4 | printf("输入一个小于256的数")；
      |                              ^~
      |                              ;
foo.c:6:1: error: 'j' undeclared (first use in this function)
    6 | j=(i>>7)+48;
      | ^
foo.c:6:4: error: 'i' undeclared (first use in this function)
    6 | j=(i>>7)+48;
      |    ^

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