How do I compile and run these C programs?

Use gcc or clang. For example: gcc program.c -o program && ./program. On Windows, use MinGW; on macOS/Linux, install via your package manager.

Which C standard do these examples use?

Examples are compatible with C99 and above. Older compilers may require flags or updates.

Can I safely copy and modify the examples?

Yes. They are provided for learning. Copy, modify inputs, and observe outputs to reinforce concepts.

Do these programs work on all platforms?

Programs use the standard library and portable constructs and have been tested on Windows, macOS, and Linux.

Number System Conversions in C

Convert between binary, octal, and decimal. Learn parsing and formatting routines for number systems with portable C code.

C Program to Convert Octal Number to Decimal and vice-versa

Program (C)

Example & Output

Octal↔Decimal conversion.

oct 17 = 15
dec 15 = 17

C Program to Convert Binary Number to Decimal and vice-versa

Program (C)

Example & Output

Binary↔Decimal conversion.

bin 101101 = 45
dec 13 = 1101

C Program to Convert Binary Number to Octal and vice-versa

Program (C)

Example & Output

Binary↔Octal conversion.

bin 101101 -> oct 55

Frequently Asked Questions

Use a standard C compiler such as gcc or clang. For example: gcc program.c -o program && ./program. On Windows, you may use MinGW or tdm-gcc; on macOS/Linux, the default package managers provide compilers.

The programs are compatible with the C99 standard and above. If you use older compilers, ensure the appropriate flags are set or update your toolchain.

Yes. These examples are intended for learning. Copy the code, experiment with changes (e.g., different inputs), and observe the output to deepen understanding.

The examples use standard library functions and portable constructs, and have been tested on major platforms (Windows, macOS, Linux). They should compile and run with any standards-compliant C compiler.

Learn C the Practical Way

C remains one of the most influential programming languages, powering operating systems, embedded devices, and performance-critical software. Practicing small, focused programs builds muscle memory and clarity with syntax and concepts such as data types, control flow, functions, arrays, pointers, and memory management.

On this page, you will find clean, well-formatted examples that compile across platforms. Each example includes a short description and expected output so you can quickly verify your understanding. Explore the topics via the sidebar and extend the code to experiment further.

Whether you’re preparing for interviews, working through coursework, or refreshing fundamentals, these examples offer a practical path to mastering C. Bookmark the page and return often to continue improving.