Visualizza wikitesto di Costruisci un anello

'''[[Build a Loop]]''' is the technique to repeate a sequence of instructions a certain number of times based on an initial and limit value and a specified increment.<br/>
It is important to declare all the loop [[variables]].<br/>
The generic statement is <code>DO/ index variable, initial value, limit value, increment</code>.<br/>


<code><span style="color: green; text-decoration: none;">$$ Example of a Do Loop</span><br/></code>
::<code>DECL/INTGR,i</code>
::<code>DECL/CHAR,20,elnm</code>
::<code>DECL/DOUBLE,xx,yy,zz</code>


<code><span style="color: green; text-decoration: none;">$$ This is to create some dummy points.</span><br/></code>
::<code>F(POI_1)=FEAT/POINT,CART,  1.111,2.222,3.333,    0,0,0<br/></code>
::<code>F(POI_2)=FEAT/POINT,CART,  4.444,5.555,6.666,    0,0,0<br/></code>
::<code>F(POI_3)=FEAT/POINT,CART,  7.777,8.888,9.999,    0,0,0<br/></code>
::<code>FA(POI_1)=FEAT/POINT,CART,  1.111,2.222,3.333,   0,0,0<br/></code>
::<code>FA(POI_2)=FEAT/POINT,CART,  4.444,5.555,6.666,   0,0,0<br/></code>
::<code>FA(POI_3)=FEAT/POINT,CART,  7.777,8.888,9.999,   0,0,0<br/></code>


<code><span style="color: green; text-decoration: none;">$$ DO/ index variable, initial value, limit value, increment</span><br/></code>
::<code>DO/i,1,3,1</code>
::::<code><span style="color: green; text-decoration: none;">	$$ commands executed during each Do cycle</span><br/></code>
::::<code>	elnm=ASSIGN/CONCAT('poi_',STR(i))</code>
::::<code>	xx=OBTAIN/FA(@elnm),3</code>
::::<code>	yy=OBTAIN/FA(@elnm),4</code>
::::<code>	zz=OBTAIN/FA(@elnm),5</code>
::::<code>	elnm=ASSIGN/CONCAT('newpoi_',STR(i))</code>
::::<code>	F(@elnm)=FEAT/POINT,CART,  xx,yy,zz,    0,0,0</code>
::::<code>	FA(@elnm)=FEAT/POINT,CART,  xx,yy,zz,    0,0,0</code>
::<code>ENDDO</code>

[[it:Costruisci un anello]]
[[zh-cn:建立一个循环]]
[[pt:Construa um Loop]]
[[de:Erstellen Sie eine Schleife]]
[[es :Construye un bucle]]
[[en:Build a Loop]]