pointer to function c

A pointer to a function in the C programming language allows you to store the address of a function in a variable. This can be useful when you want to pass a function as an argument to another function or when you want to dynamically call different functions based on certain conditions.

To declare a pointer to a function in C, you can use the following syntax:

return_type (*ptr_name)(parameter_list);

Here, return_type is the return type of the function, ptr_name is the name of the pointer, and parameter_list is the list of parameters that the function takes (if any).

To assign the address of a function to a function pointer, you can simply use the function name without the parentheses. For example:

int add(int a, int b) {
    return a + b;
}

int main() {
    int (*ptr)(int, int); // Declare a function pointer
    ptr = add; // Assign the address of the add function to the pointer

    int result = ptr(3, 4); // Call the function through the pointer
    printf("Result: %d\n", result);

    return 0;
}

In this example, we declare a function pointer ptr that takes two int parameters and returns an int. We then assign the address of the add function to ptr and call the function through the pointer, storing the result in the result variable.

Using function pointers can provide flexibility and enable dynamic behavior in your C programs.