foo.cc: In function 'int main()':
foo.cc:9:9: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
     if(0<=a&0<=b&300>=a&300>=b)
        ~^~~
foo.cc:9:21: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
     if(0<=a&0<=b&300>=a&300>=b)
                  ~~~^~~
foo.cc:9:28: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
     if(0<=a&0<=b&300>=a&300>=b)
                         ~~~^~~
foo.cc:11:8: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(c&2==00)
       ~^~~~
foo.cc:15:9: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<c;
     ~~~~^~~

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