Unlocking Systems Development: A Beginner's Guide to C Programming

C is a systems programming language popular for its efficiency and low-level access. It provides basic syntax elements (data types, operators, control flow), data structures (arrays and structures), input/output processing (file processing and command line I/O), and practical cases (calculating the area of ​​a circle through a program) , provides beginners with a guide to mastering the basics of C programming.

Unlocking System Development: A Beginner's Guide to C Programming

C is a widely respected systems programming language known for its high efficiency, low-level access, and cross-platform Known for platform compatibility. Designed for beginners, this tutorial will guide you on your journey to master the basics of C programming.

Syntax basics

Data type:

• int: integer
• float: floating point number
• char: single character

Operator:

• : addition
• -: subtraction
• * : Multiplication
• /: Division

Control flow:

• if...else: Conditional statement
• for: Loop statement
• while: Loop statement

Data structure

Array: stores a collection of elements of the same data type.
Structure: stores a collection of elements of different data types, forming a single unit.

Input/Output

File handling:

• fopen: open file
• fputs: write to file
• fgets: read file

Command line I/O:

• printf: print output
• scanf : Read user input

Practical case: Calculate the area of ​​a circle

#include <stdio.h>
#define PI 3.14159265

int main() {
    float radius;
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);
    float area = PI * radius * radius;
    printf("The area of the circle is: %.2f\n", area);
    return 0;
}

Usage:

1. Create a file named circle_area.c and paste the code.
2. Compile the file using a compiler such as gcc: gcc circle_area.c -o circle_area.
3. Run the executable: ./circle_area.
4. Enter the radius of the circle and the program will calculate and print the area.

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