zoj 3488 conic section
题目见zoj 3488很简单的题目,却没能一次搞定,因为没看清楚题目中输入数据都是实数。
该题目考察浮点数的比较(因为浮点数在计算机中存储是近似存储,所以不能直接将两个浮点数直接用大于或小于符号相比较)
/* zoj 3488 conic section */#include <stdio.h>#include <math.h>#define SMALLNUM 1e-8int main(void){double a,b,c,d,e,f;int n; scanf("%d", &n);while(n-- > 0) { scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f); if(fabs(a-c) < SMALLNUM)printf("circle\n"); else if(a * c < -SMALLNUM)printf("hyperbola\n"); else if(a * c > SMALLNUM)printf("ellipse\n"); elseprintf("parabola\n"); }return 0;}
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