vector_test.c

#include <stdio.h>
#include <stdint.h>
#include <unistd.h>

struct atom {
    double pos[3];
    uint8_t symbol[2];
};

void main()
{
struct atom my_atom = {.pos = {0,1,2}, .symbol=" H"};
printf("My atom's symbol: %s \n", my_atom.symbol);
printf("My atom's X position is: %f \n", my_atom.pos[0]);
printf("My atom's Y position is: %f \n", my_atom.pos[1]);
printf("My atom's Z position is: %f \n", my_atom.pos[2]);

}