qwe.c

#include <stdio.h>
#include <stdlib.h>

typedef struct SStudent{
  int id;
  char *name;
  float percentage;
} TStudent;

int main() {
  TStudent x, *p;
  x.id = 19;
  p = (TStudent*)&x;

  scanf("%d", &x.id);

  scanf("%d", &x.id);

  printf("%d\n", x.id);

  return 0;
}