内核中输出浮点数时为何无法显示？

pangumax

rt，
float f = 4.5;
printk("f = %f\n",f);
无法输出，输出格式对不对？

还有
int i=3;
int k=0;
k=(++i)+(++i)+(++i);
为什么k的值为16？

zhllg

no floating point in kernel
check robert love's "linux kernel development"

the behavior of statement like "(++i)+(++i)+(++i)" is compiler dependent
the c language standard leave it undefined.

dragonLinux

kernel doesn't support floating point, although it supports floating emu.

smallpeg

请问一下内核中能不能用浮点数计算？