Variable declarations of pointer to function.

functionPointers.c

#include <stdio.h>
#include <string.h>

// func1 returns a char.
char func1()
{
    return 'a';
}

// func2 returns a pointer to char.
char *func2()
{
    return "world";
}

typedef struct { char array[1]; } CharArray;

// func3 returns a pointer to CharArray.
CharArray (*func3())
{
    return &(CharArray) { {'c'} };
}

// fun4 returns a CharArray
CharArray func4()
{
    return (CharArray) { {'d'} };
}

int main()
{

    char a[] = "hello";

    char *(p[2]) = {"hello","world"}; // p is an array of pointer to char.
    char *p2[2] = {"hello","world"}; // p2 is an array of pointer to char.
    char (*q)[] = {&a}; // q is a pointer to array of char.
    char (*f)() = &func1; // f is a pointer to function returning char.
    char *(*g)() = &func2; // g is a pointer to function returning pointer to char.
    CharArray *(*h)() = &func3; // h is a pointer to function returning pointer to CharArray
    CharArray (*i)() = &func4;

    printf("%s\n", p[0]);
    printf("%s\n", p2[0]);
    printf("%s\n", *q);
    printf("%c\n", f());
    printf("%s\n", g());
    printf("%c\n", h()->array[0]);
    printf("%c\n", i().array[0]);

    return 0;
}