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请教：Keil C UV4 中unsigned long型变量运算后输出为float型出错。

2020-01-30 13:43发布

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环境51，Keil UV4
写一段程序用于对两组数据求一元线性回归，在执行到这句时遇到问题：
float VTk;
unsigned long SigmaVjTj,SigmaVj,SigmaTj;

VTk=(float)(SigmaVjTj-SigmaVj*SigmaTj/j)/(SigmaVj2-SigmaVj*SigmaVj/j);

其中SigmaVjTj=2660200
SigmaVj=2564
SigmaTj=5500
j=5
按说计算后应当为VTk= - 5.609872255，实际调试中我用如下语句
PrintChar(24,60,(unsigned char)VTk/1000000+48,1);
PrintChar(30,60,(unsigned char)VTk%1000000/100000+48,1);       
PrintChar(36,60,(unsigned char)VTk%100000/10000+48,1);
PrintChar(42,60,(unsigned char)VTk%10000/1000+48,1);
PrintChar(48,60,(unsigned char)VTk%1000/100+48,1);
PrintChar(54,60,(unsigned char)VTk%100/10+48,1);
PrintChar(60,60,(unsigned char)VTk%10+48,1);       
把结果打印到LCD，值为000,0122

实在是搞不出来了，向各位高手求救，Help~
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16条回答
millwood0
2020-01-30 23:16
"请教：Keil C UV4 中unsigned long型变量运算后输出为float型出错。"

the error is due to your inability to understand c. it has nothing to do with Keil.

"这是为什么呢？"

that is fairly simple, isn't it?

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