如何正确比较两个浮点数的大小

Question

如题所述

Answer 1

c/c++ 语言：
double a,b;
...
用条件语句：
if (a > b) printf("a greater than b\n");
else if (a < b) printf("a less than b\n");
else printf("a equ to b\n");
----
判断相等，考虑 截断误差eps;
#include <math.h>
double a,b, eps=1E-08;
if ( fabs(a-b) <eps) printf("a equ to b\n");
else printf("a no equ to b\n");

Answer 2

c/c++ 语言：
double a,b;
...
用条件语句：
if (a > b) printf("a greater than b\n");
else if (a < b) printf("a less than b\n");
else printf("a equ to b\n");
----
判断相等，考虑 截断误差eps;
#include <math.h>
double a,b, eps=1E-08;
if ( fabs(a-b) <eps) printf("a equ to b\n");
else printf("a no equ to b\n");本回答被网友采纳