How do you define a function in C?

How do you define a function in C?

• A. By specifying the input parameters only
• B. By defining the return type, function name, and parameters
• C. By declaring the function name at the end of the program
• D. By stating the function name without parameters

Answer: (B)

To define a function in C, it is essential to specify the return type, the function's name, and the parameters it takes. This structure forms the complete signature of the function, allowing the compiler to understand how to call and use the function within the program. The return type indicates what kind of value the function will return to the caller. The function name serves as the identifier that will be used to invoke it. The parameters define what input the function can accept, allowing it to operate on different data as needed. For example, a function definition might look like this: ```c int add(int a, int b) { return a + b; } ``` In this example, `int` is the return type, `add` is the function name, and it accepts two integer parameters. This clear definition enables other parts of the program to correctly call the function and understand what type of data it expects and will return. The other options mentioned lack crucial elements in defining a function, such as omitting the return type or not specifying a complete function signature, making them inadequate for defining a function correctly in the C programming language.

To define a function in C, it is essential to specify the return type, the function's name, and the parameters it takes. This structure forms the complete signature of the function, allowing the compiler to understand how to call and use the function within the program.

The return type indicates what kind of value the function will return to the caller. The function name serves as the identifier that will be used to invoke it. The parameters define what input the function can accept, allowing it to operate on different data as needed.

For example, a function definition might look like this:

int add(int a, int b) {

return a + b;

}

In this example, int is the return type, add is the function name, and it accepts two integer parameters. This clear definition enables other parts of the program to correctly call the function and understand what type of data it expects and will return.

The other options mentioned lack crucial elements in defining a function, such as omitting the return type or not specifying a complete function signature, making them inadequate for defining a function correctly in the C programming language.