標(biāo)題: 單片機(jī)ASCII碼轉(zhuǎn)Double計(jì)算精度達(dá)不到要求怎么搞程序?qū)懙�。該怎么改？求大神指�?dǎo) [打印本頁]

---

作者: 153807564    時(shí)間: 2018-11-26 14:20
標(biāo)題: 單片機(jī)ASCII碼轉(zhuǎn)Double計(jì)算精度達(dá)不到要求怎么搞程序?qū)懙�。該怎么改？求大神指�?dǎo)
用KEIL仿真然后虛擬串口連接，用printf發(fā)送出來的數(shù)值精確度只有小數(shù)點(diǎn)后5位。我要的是8位。
有沒有人會(huì)么？

1. double ASCII_to_D_Double(uchar *in_sp,uchar in_num)
   
2. {
   
3. double xdata a=0;
   
4. double xdata b;
   
5. uchar xdata j,i,k;
   
6. uchar xdata buf[8];
   
7. for(i=0;i<in_num;i++)
   
8. if(in_sp[i]=='.')break;
   
9. for(j=i+1;j<in_num;j++)buf[j-i-1]=in_sp[j]-0x30;
   
10. k=in_num-i-1;
    
11. if(k==8){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;b+=buf[3]*0.0001;b+=buf[4]*0.00001;b+=buf[5]*0.000001;b+=buf[6]*0.0000001;b+=buf[7]*0.00000001;}
    
12. else if(k==7){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;b+=buf[3]*0.0001;b+=buf[4]*0.00001;b+=buf[5]*0.000001;b+=buf[6]*0.0000001;}
    
13. else if(k==6){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;b+=buf[3]*0.0001;b+=buf[4]*0.00001;b+=buf[5]*0.000001;}
    
14. else if(k==5){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;b+=buf[3]*0.0001;b+=buf[4]*0.00001;}
    
15. else if(k==4){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;b+=buf[3]*0.0001;}
    
16. else if(k==3){b=buf[0]*0.1;b+=buf[1]*0.01;b+=buf[2]*0.001;}
    
17. else if(k==2){b=buf[0]*0.1;b+=buf[1]*0.01;}
    
18. else if(k==1){b=buf[0]*0.1;}
    
19. k=(in_sp[i-2]-0x30)*10+in_sp[i-1]-0x30;
    
20. b=k+b;
    
21. b=b/60;         
    
22. if(i==5){k=in_sp[0]-0x30;k*=100;k+=(in_sp[1]-0x30)*10;k+=in_sp[2]-0x30;}
    
23. else if(i==4){k=in_sp[0]-0x30;k*=10;k+=(in_sp[1]-0x30);}
    
24. else if(i==3){k=in_sp[0]-0x30;}  
    
25. a=b+k;
    
26. 
    
27. return a;
    
28. }

復(fù)制代碼

---

作者: xuyaqi    時(shí)間: 2018-11-26 17:15
double a = 1.11111111;

printf("%0.Mf",a);   //將M改為你想保留的幾位小數(shù)

---

歡迎光臨 (http://www.torrancerestoration.com/bbs/)

Powered by Discuz! X3.1