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

int main() {

  char password[10];
  char username[10];
  char s3[10];

  snprintf(password, 10, "11111111111111111111111111");
  snprintf(username, 10, "22222222222222222222222222222");
  snprintf(s3, 10, "333333333333333333333");

  printf("password %s\nusername %s\ns3 %s\n", password, username, s3);

  printf("username please: ");
  scanf("%s", username); // should be scanf("%9s", username);

  printf("password %s\nusername %s\ns3 %s\n", password, username, s3);
  printf("password %s\nusername %s\ns3 %s\n", password, username, s3);
  
  return 0;
}