Softcrayons Certified Tutorials

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C Language Introduction

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C is a general-purpose procedural programming language. It is known for its high performance, efficiency, and low-level memory access. Due to its speed, portability, and close interaction with hardware, C is widely used in system programming, embedded systems, and performance-critical applications.

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First C Program

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C

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<pre style="margin:0;padding:20px;font-size:15px;overflow:auto;"><code>#include &lt;stdio.h&gt;

int main(){

printf("Hello World");

return 0;

}</code></pre>

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Output

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<pre style="margin:0;font-size:16px;"><code>Hello World</code></pre>

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Structure of a C Program

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1. Header File Inclusion

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C

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<pre style="margin:0;padding:20px;font-size:15px;"><code>#include &lt;stdio.h&gt;</code></pre>

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Header files contain function declarations and macro definitions that can be used in a program. The <strong>#include</strong> directive tells the preprocessor to include the contents of the specified header file before compilation.

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Common Header Files

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<th style="padding:14px;border:1px solid #ddd;text-align:left;">Header File</th>

<th style="padding:14px;border:1px solid #ddd;text-align:left;">Purpose</th>

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<td style="padding:14px;border:1px solid #ddd;"><strong>stdio.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">Input and output functions</td>

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<td style="padding:14px;border:1px solid #ddd;"><strong>stdlib.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">Memory management and utility functions</td>

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<td style="padding:14px;border:1px solid #ddd;"><strong>string.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">String handling functions</td>

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<td style="padding:14px;border:1px solid #ddd;"><strong>math.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">Mathematical functions</td>

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<td style="padding:14px;border:1px solid #ddd;"><strong>stdint.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">Fixed-size integer data types</td>

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<td style="padding:14px;border:1px solid #ddd;"><strong>stddef.h</strong></td>

<td style="padding:14px;border:1px solid #ddd;">Standard type definitions and macros</td>

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2. Main Function

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C

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<pre style="margin:0;padding:20px;font-size:15px;"><code>int main()</code></pre>

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The <strong>main()</strong> function is the starting point of every C program. Program execution begins from this function.

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<li><strong>int</strong> specifies the return type of the function.</li>

<li><strong>main()</strong> is the function name.</li>

<li>Empty parentheses indicate that no arguments are passed.</li>

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3. Function Body

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