subject_19179.htm

一些关于vc的问答

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序号：19179 发表者：mini 发表日期：2002-10-26 09:23:57
<br>主题：警告，如何消除？
<br>内容：C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(62) : warning C4244: 'initializing' : conversion from 'const double' to 'int', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(78) : warning C4244: 'initializing' : conversion from 'int' to 'float', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(78) : warning C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(80) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(86) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(86) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data<BR>C:\新建文件夹\组合体（圆圆）\组合体（圆圆）View.cpp(88) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data<BR>Linking...<BR><BR>组合体（圆圆）.exe - 0 error(s), 7 warning(s) double i,x,y, x1,c=b+h,e=(2*c-r-sqrt(2*j*j-r*r))/2;<BR>&nbsp;&nbsp;&nbsp;&nbsp; float f=a+j,z=r*sqrt(2)-c;<BR>&nbsp;&nbsp;&nbsp;&nbsp;x1=(f+z-sqrt(2*j*j-(f-z)*(f-z)))/2;<BR>&nbsp;&nbsp;&nbsp;&nbsp; pDC-&gt;MoveTo(a+s,b+a+s-e);<BR>&nbsp;&nbsp;&nbsp;&nbsp;for (i=e;i&lt;x1;i=i+1)<BR><BR>{&nbsp;&nbsp;&nbsp;&nbsp; double&nbsp;&nbsp;c=sqrt(40000-(i-400)*(i-400)),d=500+c+i;<BR>&nbsp;&nbsp;&nbsp;&nbsp;x=(-100+d-sqrt(-d*d-790000+1800*d))/2.0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;y=x+b-i;<BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;LineTo(x,y);<BR>}<BR>&nbsp;&nbsp;pDC-&gt;LineTo(x,b+h);<BR>每次编译总有警告，但不知如何是好？请各位指点迷经。如何设置参数类型。<BR>
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<font color=red>答案被接受</font><br>回复者：青山 回复日期：2002-10-26 10:02:41
<br>内容：用强制类型转换可以消除警告，如下：<BR>pDC-&gt;LineTo((int)x,(int)y);<BR>pDC-&gt;LineTo((int)x,(int)(b+h));<BR><BR>或者是声明为int,在赋值时强制转换，如下：<BR>int x;<BR>x=(int)((-100+d-sqrt(-d*d-790000+1800*d))/2.0);<BR><BR>
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回复者：^_^ 回复日期：2002-10-26 16:16:52
<br>内容：组合体（圆圆）<BR>你的目录名字很有意思亚
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