剖析Intel IA32 架构下C 语言及CPU 浮点数机制

Version 0.01

哈尔滨工业大学 谢煜波

（email: xieyubo@126.com 网址:http://purec.binghua.com）

（QQ:13916830 哈工大紫丁香BBSID:iamxiaohan）

前言

这两天翻看一本C 语言书的时候，发现上面有一段这样写到

例：将同一实型数分别赋值给单精度实型和双精度实型，然后打印输出。

#include <stdio.h>

main()

{

float a

double b

a = 123456.789e4

b = 123456.789e4

printf(“％f\\n％f\\n”,a,b)

}

运行结果如下：-analysis fr a mework and the C language CPU float mechanism Version 0.0 a Harbin Industrial University Shushan wave (email : xieyubo@126.com website : http://purec.binghua.com) (QQ : HIT lilac BBSID 13916830 : iamxiaohan) Introduction The two epoch-making book on the C language, discovered that there are some cases written : the same number of each type is assigned to the single-precision and double-real float, then print output. # Include