Creating classes in C

is this how you guys would create a "class" in C? How about an interface? I’m guessing we just use function pointers for everything and we can change where the function pointers point to?

#ifndef CLASS
#define CLASS

void method1() { printf("method #1"); }
void method2() { printf("method #2"); }

typedef struct {
    void (*method1)(void);
    void (*method2)(void);
} Class;

Class class;

void class_setup()
{
    class.method1 = &method1;
    class.method2 = &method2;
}

#endif

int main()
{
    class_setup();

    class.method1();
    class.method2();

    return 0;
}

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