/in/foo.cc: In function 'int main()':
/in/foo.cc:7:15: error: lvalue required as left operand of assignment
    7 |   while(a=0&b=0){
      |               ^
/in/foo.cc:8:9: error: too few arguments to function 'void exit(int)'
    8 |    exit()
      |         ^
In file included from /usr/include/c++/9/cstdlib:75,
                 from /usr/include/c++/9/ext/string_conversions.h:41,
                 from /usr/include/c++/9/bits/basic_string.h:6496,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from /in/foo.cc:1:
/usr/include/stdlib.h:617:13: note: declared here
  617 | extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
      |             ^~~~