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(This article was first published on <strong><a href="http://r-exercises.com/2016/11/22/if-else-sequences-exercises-vol-2/"> R-exercises</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
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<p>Answers to the exercises are available <a target="_blank" rel="nofollow" href="http://r-exercises.com/2016/11/22/ifelse-solutions/">here</a>.</p>
<p><strong>Exercise 1</strong></p>
<p>What is the output of:<br>
<code>ifelse(sqrt(9)&lt;2,sqrt(9),0)</code></p>
<p><strong>Exercise 2</strong></p>
<p>What is the output of:<br>
<code>ifelse(sqrt(100)>9,sqrt(100),0)</code></p>
<p><strong>Exercise 3</strong><br>
What is the output <code>y</code> of:<br>
<code>x=12</code><br>
<code>if(is.numeric(x)) y=x*2</code></p>
<p><strong>Exercise 4</strong></p>
<p>What is the output <code>x,y</code> of:</p>
<p><code>z=-1</code><br>
<code>if(z&lt;0){x=abs(z);y=z*3}</code></p>
<p><strong>Exercise 5</strong></p>
<p>What is the output <code>y</code> of:<br>
<code>z=6</code><br>
<code>if(z&lt;0) y=z*3 else y=z*5</code></p>
<p><strong>Exercise 6</strong></p>
<p>What is the output <code>z</code> of:<br>
<code>x=15</code><br>
<code>y=3</code><br>
<code>if(is.numeric(x))<br>
if(is.numeric(y) &amp; y!=0)<br>
z=x/y</code></p>
<p><strong>Exercise 7</strong></p>
<p>What is the output of:<br>
<code>x=letters[20]</code><br>
<code>if (is.numeric(x)) print('is numeric') else<br>
  if(is.character(x)) print('is character')</code></p>
<p><strong>Exercise 8</strong></p>
<p>What is the output of:<br>
<code><br>
x=90<br>
ifelse(x&lt;100,ifelse(x/2==trunc(x/2),x/2,0),<br>
ifelse(x/100==trunc(x/100),x/100,-1))
<p>x=120<br>
ifelse(x&lt;100,ifelse(x/2==trunc(x/2),x/2,0),<br>
ifelse(x/100==trunc(x/100),x/100,-1))</p>
<p>x=200<br>
ifelse(x&lt;100,ifelse(x/2==trunc(x/2),x/2,0),<br>
ifelse(x/100==trunc(x/100),x/100,-1))<br>
</p>
<p><strong>Exercise 9</strong></p>
<p>What is the output <code>n</code> of:<br>
<code><br>
z='i'<br>
if (z %in% letters)<br>
if (z=='a') n=1 else<br>
  if (z=='e') n=2 else<br>
    if (z=='i') n=3 else<br>
      if (z=='o') n=4 else n=5<br>
</code></p>
<p><strong>Exercise 10</strong></p>
<p>What is the output <code>n</code> of:<br>
<code><br>
z='u'<br>
if (z %in% letters)<br>
if (z=='a') n=1 else<br>
  if (z=='e') n=2 else<br>
    if (z=='i') n=3 else<br>
      if (z=='o') n=4 else n=5<br>
</code></p>

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