/in/foo.cc: In function 'int count(char*)':
/in/foo.cc:5:23: error: 'length' was not declared in this scope
     int len=length(str),cnt=0,i=0;
                       ^
/in/foo.cc:8:17: error: 'i' was not declared in this scope
         if (str[i]>=97 && str[i]<=122)
                 ^
/in/foo.cc:10:13: error: 'cnt' was not declared in this scope
             cnt++;
             ^~~
/in/foo.cc:12:9: error: 'i' was not declared in this scope
         i++;
         ^
/in/foo.cc:14:12: error: 'cnt' was not declared in this scope
     return cnt;
            ^~~