/in/foo.cc: In function 'int main()':
/in/foo.cc:12:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  while(c>='a'&&c<='z'||c>='A'&&c<='Z')
        ~~~~~~^~~~~~~~
/in/foo.cc:41:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   while(str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z')
         ~~~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:6:10: warning: unused variable 'j' [-Wunused-variable]
  int n,i,j,sum=0;
          ^