As the others already said, it's the old way of declaring the arguments type. But I think it's good to know other pitfalls: - The "default" return type of a f

As the others already said, it's the old way of declaring the arguments type. But I think it's good to know other pitfalls: - The "default" return type of a function is int - A function that does not use void to tell that it takes no argument just have an undefined number of parameters See this example: https://ideone.com/GfwS4O https://ideone.com/GfwS4O You could in theory use the address of a local variable (allocated on the stack) to access the arguments passed to the function directly on the stack. But this is just madness... Or is it ? Isn't C just assembly with a "nicer" syntax ?