_chkfloat_:
unsigned char _chkfloat_ ( float val); /* number to check */
函数功能:
_chkfloat_函数检查浮点数 val 的类型。 _chkfloat_函数返回浮点数 val 的类型。
返回值 | 意义 |
| 标准浮点数 | 鱼缸恒温器
1 | 浮点0 |
2 | +INF 正溢出 |
3 | -INF 负溢出 |
4 | NaN 非数 |
| |
#include <reg51.h>
#include <intrins.h>
/*
胃蝇本实验测试本征库中的_chkfloat_函数
函数定义:unsigned char _chkfloat_(float val);
返回值:
Return Value Meaning
0 Standard floating-point number.
1 Floating-point value 0.
2 +INF (positive overflow).
3 -INF (negative overflow).
4 NaN (Not a Number) error status.
用P1指示返回值
*/
unsigned char f[4]={0xff,0xff,0xff,0xff};
void delay(unsigned int time)
{大功率led天花灯
while(time--);
}
void main()
{
P2=~_chkfloat_(1.2455); //Standard floating-point number.
delay(50000);
P2=~_chkfloat_(0.00); //Floating-point value 0.
delay(50000);
P2=~_chkfloat_(1000000000000000000000000000000000000000000000000000000000000000.0000000000); //+INF (positive overflow).
delay(50000);
P2=~_chkfloat_(-1000000000000000000000000000000000000000000000000000000000000000.0000000000); //-INF (negative overflow).
delay(50000);
P2=~_chkfloat_(*((float *)f)); //NaN (Not a Number) error status.
while(1);
}
_crol_:
函数定义:
unsigned char _crol_ ( unsigned char c, /* character to rotate left */
unsigned char b); /* bit positions to rotate */
函数功能:
_crol_函数将一个字节c循环左移b位。
返回值:
_crol函数返回将c循环左移b位后的值。
函数测试:
#include <reg51.h>
#include <intrins.h>
/*
本实验测试本征库中的_crol_函数
函数定义:unsigned char _crol_(unsigned char c,unsigned char b);
返回值:_crol_函数返回将c循环左移b位后的值。
用P1指示返回值
*/
void delay(unsigned int time)物理除垢
{
while(time--);
}共沸精馏
void main()
{
unsigned char i;
i=0;