所以对于我的一个类，我必须用c创建一个.txt文件，然后删除其中的几行。
创建功能进行顺利的任何方式，但删除功能只工作后，我单独创建文件，然后删除，而创建功能变成了一个注解（又名它只工作时，我删除行关闭一个文件，已经创建前执行）
有没有办法让它们同时工作？
ps：idk如果这是一个明显的问题，一个非初学者

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 256

typedef struct a
{
    int quan, num, price;
    char name[100];
} ar;
ar art;

void ajt(int n)
{
    int i;
    FILE *f = fopen("stock.txt", "w");
    if (f == NULL)
        return;
    for (i = 1; i <= n; i++)
    {
        printf("name of the product n* %d: ", i);
        scanf("%s", &art.name);
        fprintf(f, "name of the product n* %d is: %s  ", i, art.name);
        printf("number of the product n* %d: ", i);
        scanf("%d", &art.num);
        fprintf(f, "number of the product n* %d is: %d   ", i, art.num);
        printf("quantity of the product n* %d: ", i);
        scanf("%d", &art.quan);
        fprintf(f, "quantity of the product n* %d is: %d   ", i, art.quan);
        printf("price of the product n* %d:", i);
        scanf("%d", &art.price);
        fprintf(f, "price of the product n* %d is: %d   \n", i, art.price);
        printf("\n\n");
    }
}

void del()
{
    FILE *fileptr1, *fileptr2;
    char filename[40];
    char ch;
    int delete_line, temp = 1;

    printf("the name of your file: ");
    scanf("%s", filename);
    fileptr1 = fopen(filename, "r");
    ch = getc(fileptr1);

    while (ch != EOF)
    {
        printf("%c", ch);
        ch = getc(fileptr1);
    }

    rewind(fileptr1);

    printf("which product do u want to delete?  ");
    scanf("%d", &delete_line);
    fileptr2 = fopen("copy.c", "w");
    ch = getc(fileptr1);

    while (ch != EOF)
    {
        ch = getc(fileptr1);
        if (ch == '\n')
            temp++;
        if (temp != delete_line)
        {
            putc(ch, fileptr2);
        }
    }

    fclose(fileptr1);
    fclose(fileptr2);
    remove(filename);
    rename("copy.c", filename);

    printf("\n the text file after modifications:\n");
    fileptr1 = fopen(filename, "r");
    ch = getc(fileptr1);

    while (ch != EOF)
    {
        printf("%c", ch);
        ch = getc(fileptr1);
    }
    fclose(fileptr1);
}

int main()
{
    int n;
    printf("how many products: ");
    scanf("%d", &n);
    printf("\n\n");
    ajt(n);
    del();
}