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#include <stddef.h>
#include <stdio.h>

void
dummy(void f(void))
{
    f();
}

// ------------------------

void
foo(void)
{
    printf("I am foo\n");
}

void
bar(void)
{
    printf("I am bar\n");
}

int
main(void)
{
    void (*f[])(void) = {
        foo,
        bar,
    };

    for (size_t i = 0; i < sizeof(f) / sizeof(f[0]); ++i) {
        printf("calling f[%zu]: ", i);
        dummy(f[i]);
    }
}