struct assignment in main()

test.c

#include <stdio.h>

struct complex_struct {
    double x, y;
};

struct complex_struct z;

/*expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token*/
/* assignment struct must be in main() */

int main(int argc, char const *argv[]) {
    z.x = 1.0;
    z.y = 2.0;
    printf("z=%f+%fi\n", z.x, z.y);
    return 0;
}