Can formal parameters be constants in C language?

Formal parameters in C language can be constants, which are declared as constant parameters by adding the const keyword before the parameter type. Advantages of constant parameters: Improve code robustness and readability; Disadvantages: Limit flexibility and may cause performance overhead.

Can formal parameters in C language be constants?

Answer: Can

Detailed explanation:

In C language, formal parameters (function parameters) Can be a constant. You can declare a parameter as a constant parameter by prefixing it with the keyword const. Constant parameters have the following characteristics:

• cannot be modified by assignment statements in the function body.
• can be used as part of a constant expression.

Advantages:

• Improve code robustness: Constant parameters prevent accidental modification of incoming values, thereby improving Code robustness and security.
• Enhance code readability: Constant parameters indicate that the parameters passed in should not be modified, improving the readability and maintainability of the code.

Disadvantages:

• #Limited flexibility: Constant parameters cannot be modified within the function body, which limits the functionality of the function flexibility.
• May cause performance overhead: Constant parameters must be copied each time the function is called, which increases performance overhead.

Example:

void print_array(const int *arr, int size) {
  // arr is a constant pointer to an array of int
  // size is a constant integer

  for (int i = 0; i < size; i++) {
    printf("%d ", arr[i]);
  }
}

In this example, the arr parameter is declared as a constant pointer pointing to an intarray. sizeThe formal parameter is declared as a constant integer. Therefore, function print_array cannot modify the passed array or its size.

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