Quick and simple demonstration about multiple ways of accessing arrays within a struct

index_addresses.c

#include <stdio.h>

typedef struct _vertexStruct {
	float vertex[2];
	float color[3];
} vertexStruct;

int main(void) {
	
	vertexStruct vertices[] = {
		{ {1.0, 0.0}, {1.0, 1.0, 1.0} },
		{ {0.0, 1.0}, {0.0, 1.0, 0.0} }
	};
	
	printf("The second color's red is %f\n", vertices[1].color[0]);
	printf("The second color's green is %f\n", vertices[1].color[1]);
	
	// These should each be the same
	printf("The address of the vertices array is %p\n", vertices);
	printf("The address of the first vertices element is %p\n", &vertices[0]);
	printf("The address of the first vertex element is %p\n", &vertices[0].vertex);
	printf("The address of the first vertex indexed element is %p\n", &vertices[0].vertex[0]);
	
	// These should be the same
	printf("The address of the first color element is %p\n", &vertices[0].color);
	printf("The address of the first color indexed element is %p\n", &vertices[0].color[0]);
	
	// And these should be the same
	printf("The address of the second color element is %p\n", &vertices[1].color);
	printf("The address of the second color indexed element is %p\n", &vertices[1].color[0]);
	
	// your code goes here
	return 0;
}