Write a function in R programming Language which will take parameter and the value will default value.

R Programming Language Function in R Language (Article) Function in R Language (Program)

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Program:

<span class="com"># R function</span><span class="pln">

hello</span><span class="pun">.</span><span class="pln">person </span><span class="pun">&lt;-</span><span class="pln"> </span><span class="kwd">function</span><span class="pun">(</span><span class="pln">firstName</span><span class="pun">,</span><span class="pln"> lastName </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Ansari"</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
  </span><span class="kwd">print</span><span class="pun">(</span><span class="pln">sprintf</span><span class="pun">(</span><span class="str">"Hello %s %s"</span><span class="pun">,</span><span class="pln"> firstName</span><span class="pun">,</span><span class="pln"> lastName</span><span class="pun">))</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="com"># different way of function calling</span><span class="pln">
hello</span><span class="pun">.</span><span class="pln">person</span><span class="pun">(</span><span class="str">"Rumman"</span><span class="pun">)</span><span class="pln">

hello</span><span class="pun">.</span><span class="pln">person</span><span class="pun">(</span><span class="pln">firstName </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Rumman"</span><span class="pun">)</span><span class="pln">

hello</span><span class="pun">.</span><span class="pln">person</span><span class="pun">(</span><span class="pln">firstName </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Ansari"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"Azmi"</span><span class="pun">)</span><span class="pln">

</span><span class="com"># this function calling will not work</span><span class="pln">
hello</span><span class="pun">.</span><span class="pln">person</span><span class="pun">(</span><span class="pln">lastName </span><span class="pun">=</span><span class="pln"> </span><span class="str">"Rumman"</span><span class="pun">)</span><span class="pln">
</span>

Output:

> hello.person("Rumman")
[1] "Hello Rumman Ansari"
> 
> hello.person(firstName = "Rumman")
[1] "Hello Rumman Ansari"
> 
> hello.person(firstName = "Ansari", "Azmi")
[1] "Hello Ansari Azmi"
> # this function calling will not work
> hello.person(lastName = "Rumman")
 Error in sprintf("Hello %s %s", firstName, lastName) : 
  argument "firstName" is missing, with no default

Explanation:

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