Loops/For: Difference between revisions
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puts "" |
puts "" |
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end</lang> |
end</lang> |
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or {{works with|Ruby|1.8.7+}} |
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or |
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<lang ruby>5.times do |i| # i goes from 0 to 4 |
<lang ruby>5.times do |i| # i goes from 0 to 4 |
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(i+1).times do |
(i+1).times do |
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Revision as of 01:10, 11 June 2009
You are encouraged to solve this task according to the task description, using any language you may know.
Specifically print out the following pattern by using one for loop nested in another:
* ** *** **** *****
ActionScript
<lang actionscript> for (var i:int = 1; i <= 5; i++) {
for (var j:int = 1; j <= i)
trace("*");
} </lang>
Ada
<lang ada>for I in 1..5 loop
for J in 1..I loop
Put("*");
end loop;
New_Line;
end loop;</lang>
ALGOL 68
FOR i TO 5 DO
TO i DO
print("*")
OD;
print(new line)
OD
Output:
* ** *** **** *****
AmigaE
<lang amigae>PROC main()
DEF i, j
FOR i := 1 TO 5
FOR j := 1 TO i DO WriteF('*')
WriteF('\n')
ENDFOR
ENDPROC</lang>
AutoHotkey
<lang AutoHotkey> Gui, Add, Edit, vOutput r5 w100 -VScroll ; Create an Edit-Control Gui, Show ; Show the window loop, 5 ; loop 5 times { loop, %A_Index% ; A_Index contains the Index of the current loop { output .= "*" ; append an "*" to the output var GuiControl, , Output, %Output% ; update the Edit-Control with the new content sleep, 500 ; wait some(500ms) time, [just to show off] } Output .= (A_Index = 5) ? "" : "`n" ; append a new line to the output if A_Index is not "5" } return ; End of autoexcution section </lang>
AWK
<lang awk>BEGIN {
for(i=1; i < 6; i++) {
for(j=1; j <= i; j++ ) {
printf "*"
}
print
}
}</lang>
BASIC
<lang qbasic>for i = 1 to 5
for j = 1 to i
print "*";
next j
print
next i</lang>
Befunge
1>:5`#@_:>"*",v
| :-1<
^+1,+5+5<
C
<lang c>int i, j; for (i = 1; i <= 5; i++) {
for (j = 1; j <= i; j++)
putchar('*');
puts("");
}</lang>
C++
<lang cpp> for(int i = 1; i <= 5; ++i) {
for(int j = 1; j <= i; j++)
std::cout << "*";
std::cout << std::endl;
}</lang>
C#
<lang csharp>using System;
class Program {
static void Main(string[] args)
{
for (int i = 0; i < 5; i++)
{
for (int j = 0; j <= i; j++)
{
Console.Write("*");
}
Console.WriteLine();
}
}
}</lang>
ColdFusion
Remove the leading space from the line break tag.
With tags:
<cfloop index = "i" from = "1" to = "5">
<cfloop index = "j" from = "1" to = "#i#">
*
</cfloop>
< br />
</cfloop>
With script:
<cfscript>
for( i = 1; i <= 5; i++ )
{
for( j = 1; j <= i; j++ )
{
writeOutput( "*" );
}
writeOutput( "< br />" );
}
</cfscript>
Common Lisp
<lang lisp>(loop for i from 1 upto 5 do
(loop for j from 1 upto i do (write-char #\*)) (write-line ""))</lang>
<lang lisp>(dotimes (i 5)
(dotimes (j (+ i 1)) (write-char #\*)) (terpri))</lang>
<lang lisp>(do ((i 1 (+ i 1)))
((> i 5))
(do ((j 1 (+ j 1)))
((> j i))
(write-char #\*))
(terpri))</lang>
D
<lang d>for(int i = 0; i < 5; i++) {
for(int j = 0; j <= i; j++)
writef("*") ;
writefln() ;
}</lang> Foreach Range Statement since D2.003 <lang d>foreach(i ; 0..5) {
foreach(j ; 0..i+1)
writef("*") ;
writefln() ;
}</lang>
E
<lang e>for width in 1..5 {
for _ in 1..width {
print("*")
}
println()
}</lang>
This loop is a combination of for ... in ... which iterates over something and a..b which is a range object that is iteratable. (Also, writing a..!b excludes the value b.)
FALSE
1[$6-][$[$]["*"1-]#%" "1+]#%
Forth
: triangle ( n -- )
1+ 1 do
cr i 0 do [char] * emit loop
loop ;
5 triangle
Fortran
<lang fortran> DO i = 1, 5
DO j = 1, i
WRITE(*, "(A)", ADVANCE="NO") "*"
END DO
WRITE(*,*)
END DO</lang>
Fortran 95 (and later) has also a loop structure that can be used only when the result is independent from real order of execution of the loop.
<lang fortran>integer :: i integer, dimension(10) :: v
forall (i=1:size(v)) v(i) = i</lang>
F#
#light
[<EntryPoint>]
let main args =
for i = 1 to 5 do
for j = 1 to i do
printf "*"
printfn ""
0
Haskell
import Control.Monad
main = do
forM_ [1..5] $ \i -> do
forM_ [1..i] $ \j -> do
putChar '*'
putChar '\n'
J
J is array-oriented, so there is very little need for loops. For example, one could satisfy this task this way:
]\ '*****'
J does support loops for those times they can't be avoided (just like many languages support gotos for those time they can't be avoided).
3 : 0
for_i. 1 + i. y do.
z =. ''
for. 1 + i. i do.
z=. z,'*'
end.
z 1!:2 ] 2
end.
i.0 0
)
But you would never see J code like this.
Java
<lang java>for (int i = 0; i < 5; i++) {
for (int j = 0; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}</lang>
JavaScript
for (var i=1; i<=5; i++) {
s = "";
for (var j=0; j<i; j++)
s += '*';
print(s);
}
Logo
for [i 1 5] [repeat :i [type "*] (print)] repeat 5 [repeat repcount [type "*] (print)]
MAXScript
for i in 1 to 5 do
(
line = ""
for j in 1 to i do
(
line += "*"
)
format "%\n" line
)
Modula-3
<lang modula3>MODULE Stars EXPORTS Main;
IMPORT IO;
BEGIN
FOR i := 1 TO 5 DO
FOR j := 1 TO i DO
IO.Put("*");
END;
IO.Put("\n");
END;
END Stars.</lang>
OCaml
<lang ocaml>for i = 1 to 5 do
for j = 1 to i do print_string "*" done; print_newline ()
done</lang>
Octave
<lang octave>for i = 0:1:4
for j = 0:1:i
printf("*");
endfor
printf("\n");
endfor</lang>
Pascal
<lang pascal> program stars(output);
var
i, j: integer;
begin
for i := 1 to 5 do
begin
for j := 1 to i do
write('*');
writeln
end
end. </lang>
Perl
<lang perl>foreach (1..5) {
foreach (1..$_) {
print '*';
}
print "\n";
}</lang>
However, if we lift the constraint of two loops the code will be simpler:
<lang perl>print ('*' x $_ . "\n") for 1..5 </lang>
PHP
<lang php>for ($i = 1; $i <= 5; $i++) {
for ($j = 1; $j <= $i; $j++) {
echo '*';
}
echo "\n";
}</lang> or <lang php>foreach (range(1, 5) as $i) {
foreach (range(1, $i) as $j) {
echo '*';
}
echo "\n";
}</lang>
Pop11
lvars i, j;
for i from 1 to 5 do
for j from 1 to i do
printf('*','%p');
endfor;
printf('\n')
endfor;
Python
<lang python>import sys for i in xrange(5):
for j in xrange(i+1):
sys.stdout.write("*")
print</lang>
Note that we have a constraint to use two for loops, which leads to non-idiomatic Python. If that constraint is dropped we can use the following, more idiomatic Python solution: <lang python>for i in range(1,6):
print '*' * i
</lang>
Ruby
<lang ruby>for i in 1..5 do
for j in 1..i do
print "*"
end
puts ""
end</lang> or <lang ruby>1.upto(5) do |i|
1.upto(i) do |j|
print "*"
end
puts ""
end</lang>
or
<lang ruby>5.times do |i| # i goes from 0 to 4
(i+1).times do
print "*"
end
puts ""
end</lang>
Scheme
<lang scheme>(do ((i 1 (+ i 1)))
((> i 5))
(do ((j 1 (+ j 1)))
((> j i))
(display "*"))
(newline))</lang>
Slate
<lang slate> 1 to: 5 do: [| :n | inform: ($* repeatedTimes: n)]. </lang>
Smalltalk
<lang smalltalk>1 to: 5 do: [ :aNumber |
aNumber timesRepeat: [ '*' display ]. Character nl display.
]</lang>
Tcl
<lang tcl>for {set lines 1} {$lines <= 5} {incr lines} {
for {set i 1} {$i <= $lines} {incr i} {
puts -nonewline *
}
puts ""
}</lang> Note that it would be more normal to produce this output with: <lang tcl>for {set i 1} {$i <= 5} {incr i} {
puts [string repeat "*" $i]
}</lang>
UnixPipes
yes \ | cat -n | (while read n ; do [ $n -gt 5 ] && exit 0; yes \* | head -n $n | xargs -n $n echo done)
Visual Basic .NET
For x As Integer = 0 To 4
For y As Integer = 0 To x
Console.Write("*")
Next
Console.WriteLine()
Next