How do you apply a function to all the elements in the array?-CodePudding

I want to write a program with following signature where the function will be applied to all the elements of the array in c.

void map(unsigned(*function_name)(unsigned), 
         size_t funct_length, 
         arr_name[funct_length]);

Everything is unsigned.

CodePudding user response：

There are a few blanks on your question, but the following code provides you with a starting point. Some issues:

(*function_name)(unsigned) is a pointer function, the other parameters are the array size and a pointer to the array, I produced two invented functions, map_add_point and map_remove_point, so each function will be applied to all the elements of the array.

void map(unsigned (*function_name)(unsigned), size_t funct_length, unsigned arr_name[]);

unsigned map_add_point(unsigned);
unsigned map_remove_point(unsigned);

int main()
{
    unsigned points_a[] = {1,2,3};
    unsigned points_b[] = {1,2};

    map(map_add_point, sizeof(points_a)/sizeof(unsigned), points_a);
    map(map_remove_point, sizeof(points_a)/sizeof(unsigned), points_b);

    return 0;
}

void map(unsigned (*funct_length)(unsigned), size_t length, unsigned arr_name[])
{
    size_t n;

    for (n = 0; n < length; n  )
    {
        (*funct_length) (arr_name[n]);
    }

}


unsigned map_add_point(unsigned point)
{
        printf("\nPoint to add: %d", point);
        return 0;
}


unsigned map_remove_point(unsigned point)
{
        printf("\nPoint to remove: %d", point);
        return 0;
}

CodePudding user response：

Minimalistic:

void map(unsigned(*function_name)(unsigned), size_t funct_length, unsigned arr_name[funct_length])
{
    while(funct_length--)
    {
        *arr_name = function_name(*arr_name);
        arr_name  ;
    }
}