在文件中工作時，字符串常量前應為“）”

這段代碼摘自我在C課程的最后一個項目。這是我第一次使用文件和fopens可以有人幫我解決這個問題，并引導我能夠保存用戶數據在我的程序，所以幫助我解決它

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

//main function
int main(){
    system("cls"); //Clears screen
    mainmenu();
}
//date structure
struct date{
    int month,day,year;};
//main structure
struct {char name[50];
    char adress[60];
    char nationality[20];
    char acctype[23];
    double phone;
    int acc_no;
    double deposit;
    double age;
    struct date dob; //struct inside a struct for day of birth
    struct date newa;//struct in date struct for new account
    }add,check;

//new account function
void newacc(){

   FILE *records;
    records = fopen("records.dat","a+");

    system("cls");
    printf("Create an account Number:\n");
    scanf("%d",&check.acc_no);
     if(check.acc_no==add.acc_no) printf("Acount Already in use!");
    printf("Name:\n");
    scanf("%s",add.name);
    printf("Age:\a");
    scanf("%lf",&add.age);
    printf("Phone number:\n");
    scanf("%lf",&add.phone);
    printf("Nationality:\n");
    scanf("%s",add.nationality);
    printf("Today's Date *date account created*(dd/mm/yyyy):\n");
    scanf("%d/%d/%d",&add.newa.day,&add.newa.month,&add.newa.year);
    printf("Date of birth (dd/mm/yyyy):\n");
    scanf("%d/%d/%d",&add.dob.day,&add.dob.month,&add.dob.year);
    printf("Account type:\n#Savings \n#Fixed 3 years \n#Fixed 10 years\n");
    scanf("%s",add.acctype);}
//Error starts here
    fprintf(records,"Account Number: %d\n Name:%s\n Age: %lf\n Phone Number: %lf\n Nationality: %s/n Day account created: %d/%d%/%d\n Date of birth: %d/%d/%d %s\n",add.acc_no,add.name,add.age,add.phone,add.nationality,add.newa.day,add.newa.month,add.newa.year,add.dob.day,add.dob.month,add.dob.year,add.acctype);
    fclose(records);

    printf("\nAccount created successfully!");

所以我的問題是在文件部分和使用它。