/in/foo.cc: In function 'void read(int&)':
/in/foo.cc:9:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
    9 |     while(!isdigit(c=getchar())); x=c-48;       //不需要输入优化
      |     ^~~~~
/in/foo.cc:9:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
    9 |     while(!isdigit(c=getchar())); x=c-48;       //不需要输入优化
      |                                   ^