Conditional structures: Difference between revisions

=={{header|Maple}}==

Maple offers both conditional statements and conditional functions.

=== Conditional statements ===

Example syntax for conditional statements:

<code>if x > 0 then

res := x;

else

res := -x;

end if;</code>

Example syntax for conditional statements with else-if:

<code>if x = 0 then

res := y;

elif y = 0 then

res := x;

else

res := sqrt(x^2+y^2);

end if;</code>

=== Conditional functions ===

The function <code>`if`(cond,a,b)</code> (note the backtick <code>`</code> delimiters) returns ''a'' when ''cond'' is true and ''b'' otherwise.

<code>res := `if`(n::even, n/2, 3*n+1);</code>

The piecewise command can be used for functional evaluation in which there is more than one branch. The following is equivalent to the if/then construct from the previous section.

<code>res := piecewise(x=0, y, y=0, x, sqrt(x^2+y^2));</code>