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You have already seen the following code a couple of times in the first chapters. Let's break it down and understand what each part does:
Syntax:-

</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">#include <stdio.</span><span class="javapropertycolor" style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">h</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">></span><br style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"><br style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"><span class="javakeywordcolor" style="box-sizing: inherit; color: rgb(0, 92, 197); font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">int</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"> main() {</span><br style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">  printf(</span><span class="javastringcolor" style="box-sizing: inherit; color: green; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">"Hello World!"</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">);</span><br style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"> </span><span class="javanumbercolor" style="box-sizing: inherit; color: rgb(153, 0, 85); font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"> </span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"></span><span class="javakeywordcolor" style="box-sizing: inherit; color: rgb(0, 92, 197); font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">return</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"> </span><span class="javanumbercolor" style="box-sizing: inherit; color: rgb(153, 0, 85); font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">0</span><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">;</span><br style="box-sizing: inherit; font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;"><span style="font-family: Consolas, Menlo, "courier new", monospace; font-size: 15px;">}</span><span style="font-size: 20px;">