foo.cc: In function 'int main()':
foo.cc:7:8: error: 'a' was not declared in this scope
     if(a==1,b==16)
        ^
foo.cc:7:13: error: 'b' was not declared in this scope
     if(a==1,b==16)
             ^
foo.cc:9:5: error: 'a' was not declared in this scope
  if(a==1,b==7)
     ^
foo.cc:9:10: error: 'b' was not declared in this scope
  if(a==1,b==7)
          ^