/in/foo.cc: In function 'int main()':
/in/foo.cc:70:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if ('0' < str[i] && str[i] > '9' || str[i] == ',' ||
             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc:86:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if ('0' > str[i] && str[i] < '9' || str[i] == '/') {  //一个数记录完毕
             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc:62:7: warning: unused variable 'n' [-Wunused-variable]
   int n;
       ^