printf("%d\n",int(2-0.1*0.1*100));

结果为啥是0呢? 这是我所有的尝试，并没有找出原因，求救！

？float a = 0.1;
	printf("a = %f\n",a);
	printf("a*a*100 = %f\n",a*a*100);
	cout<<a*a*100<<endl;
	printf("int(a*a*100) = %d\n",int(a*a*100));
	printf("int(2-a*a*100) = %d\n",int(2-a*a*100));
	printf("%.10f",int(2-a*a*100));