#include <stdio.h>
#include <stdlib.h>

double ant(char c, int i) {
    printf("in ant\n");
    return 1.0 * i / c;
}

double bat(char see, int eye) {
    printf("in bat\n");
    return 1.0 * eye * see;
}

int main(int argc, char* argv[]) {
    
    // DECLARE A FUNCTION ADDRESS VARIABLE THAT YOU CAN ASSIGN
    // ant(…) or bat(…) to.
    double (*animal_fn)(char, int) = ant;

    // Call the function ( ant(…) )
    animal_fn('A', 13);

    // Assign a different function to animal_fn.
    animal_fn = bat;

    // Call the function ( bat(…) )
    animal_fn('A', 13);

    // Yes, you can assign NULL to a function address variable
    animal_fn = NULL;

    return EXIT_SUCCESS;
}
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