Question

How to use anonymous struct in C

Answer 1

#include <stdio.h>

typedef struct {
	struct { // anonymous struct
		float x, y;
	} pos;
	struct { // anonymous struct
		float r, g, b;
	} color;
} Vertex;

int main() {
    Vertex vr;
      
    printf("size: %zu\n", sizeof(vr));
    
    vr.pos.x = 100.0f;
    vr.pos.y = 200.0f;
  
    printf("vr.pos.x: %.2f\n", vr.pos.x);
    printf("vr.pos.y: %.2f\n", vr.pos.y);
    
    vr.color.r = 60.0f;
    vr.color.g = 255.0f;
    vr.color.b = 80.0f;
    
    printf("vr.color.r: %.2f\n", vr.color.r);
    printf("vr.color.g: %.2f\n", vr.color.g);
    printf("vr.color.b: %.2f\n", vr.color.b);
  
    return 0;
}

  

/*
run:
  
size: 20
vr.pos.x: 100.00
vr.pos.y: 200.00
vr.color.r: 60.00
vr.color.g: 255.00
vr.color.b: 80.00

*/

 

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