Factorial in C and Assembly (Mixed Language Programming)

This project demonstrates mixed-language programming by combining C and x86-64 Assembly to compute the factorial of a number. The C program handles user input/output, while the Assembly function performs the core calculation.

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⚡ How It Works

• The C program manages input/output and calls an external Assembly function.

• The Assembly function contains the core computation logic, showcasing how lower-level instructions can be integrated into high-level code.

• Function calls follow the x86-64 calling convention:

  • C passes the argument (n) in a register.
  • Assembly executes the calculation and stores the result.
  • The result is returned back to C for display.

• This demonstrates the interoperability between C and Assembly, where each language handles the part it’s best suited for.

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🛠️ Compilation & Execution

Make sure you have GCC installed via MinGW-w64 and available in your PATH.

gcc factorial.c fact.s -o factorial.exe
.\factorial.exe

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🖥️ Example Run

Enter a number: 5
Factorial of 5 is 120