Redigi due programmi che generino le due figure sottostanti a sinistra.  Quindi redigine due che generino le altre due.

0000000000 0 0000000000 0000000 0 0 00 0000000000 000000 0 0 0 0 0000000000 00000 0 0 0 0 0000000000 0000 0 0 0 0 0000000000 000 0000000000 000000 0000000000 00 0

Ecco come generare le figure con R:

source("http://macosa.dima.unige.it/r.R")
HF=1.5; BF=1.5
BOXW(0,11,0,11)    # o: boxmN(...)  box monometrico con Nessuna (Without) griglia
x <- 1:10; text(x,10,"O"); text(x,5,"O")
y <- 10:5; text(1,y,"O"); text(10,y,"O")
# per vedere la griglia posso introdurre:  BOX()
#
BOXW(0,11,0,11)
y <- 10:5; text(1,y,"O")
x <- 1:6; text(x,5,"O"); text(x,11-x,"O")
#
BOXW(0,11,0,11)
x <- 1:10; for(y in 10:5) text(x,y,"O")
#
BOXW(0,11,0,11)
for(x in 1:7) for(y in x:7) text(x,y,"O")
#
# Ovvero:  HF=2.2; BF=2.2; PLANEww(0,11,0,11)  # o: PIANOss(0,11,0,11)

Ecco i programmi, redatti in QBasic e in JavaScript ( "calcolatore 2" neGli Oggetti Matematici):

for i=1 to 6 : for j=1 to 10
if j=1 or j=10 or i=1 or i=6 then print "0"; else print " ";
next
print : next

for i=1 to 6 : for j=1 to i
if j=1 or j=i or i=1 or i=6 then print "0"; else print " ";
next
print : next

for i=1 to 6 : for j=1 to 10
print "0";
next
print : next

for i=1 to 7 : for j=1 to 8-i
print "0";
next
print : next

<pre><script>
for (i=1; i<=6; i=i+1)
{ for (j=1; j<=10; j=j+1)
 { if (i==1 || j==1 || j==10 || i==6) document.write('0')
 else document.write(' ')}
 document.writeln('') }
</script></pre>

<script>
for (i=1; i<=6; i=i+1)
{ for (j=1; j<=i; j=j+1)
 { if (i==1 || j==1 || j==i || i==6) document.write('0')
 else document.write(' ')}
 document.writeln('') }
</script></pre>

<pre><script>
for (i=1; i<=6; i=i+1)
{ for (j=1; j<=10; j=j+1)
 document.write('0');
 document.writeln('')};
</script></pre>

<pre><script>
for (i=1; i<=7; i=i+1)
{ for (j=1; j<=7-i+1; j=j+1)
  document.write('0');
 document.writeln('') }
</script></pre>

Figure simili possono essere costruite facilmente anche con WolframAlpha.  vedi.