/in/foo.c: In function 'main':
/in/foo.c:6:3: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration]
  -pow(10,10)<=a<=pow(10,10);
   ^~~
/in/foo.c:6:3: warning: incompatible implicit declaration of built-in function 'pow'
/in/foo.c:6:3: note: include '<math.h>' or provide a declaration of 'pow'
/in/foo.c:6:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  -pow(10,10)<=a<=pow(10,10);
  ~~~~~~~~~~~^~~
/in/foo.c:6:2: warning: statement with no effect [-Wunused-value]
  -pow(10,10)<=a<=pow(10,10);
  ^
/in/foo.c:7:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  -pow(10,10)<=b<=pow(10,10);
  ~~~~~~~~~~~^~~
/in/foo.c:7:2: warning: statement with no effect [-Wunused-value]
  -pow(10,10)<=b<=pow(10,10);
  ^