C言語　text fileについて

前提・実現したいこと

どうすれば　textfile　に保存できるかを教えてもらいたい。
または、間違えているところを教えてもらいたい

発生している問題・エラーメッセージ

text fileに読み込めない


Unhandled exception at 0x7AB8F2F6 (ucrtbased.dll) in CS36 Project10.exe: An invalid parameter was passed to a function that 
considers invalid parameters fatal

該当のソースコード

void savetext(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    FILE* f;
    f = fopen("d:\grocery.txt", "w");
    for (int i = 0; i < n; i++)
    {
        fprintf(f, "%s\n", g[i].item);
        fprintf(f, "%0.2f %0.2f %0.2f\n", totalcost, totaldisc, totalcwd);
    }
    fclose(f);
}

###　ソースコード

#define _CRT_SECURE_NO_WARNINGS
#define SIZE 4
#include<stdio.h>
#include<stdlib.h>
#include<string.h>



struct Grocery
{
    char item[20], brand[20];
    int qty;
    float price, disc, cost, discamt, cwd;
};

void load(struct Grocery g[], float* totalcost, float* totaldisc, float* totalcwd, int n)
{
    for (int i = 0; i < n; i++)
    {
       
        printf("Enter an item name ");
        gets_s(g[i].item);
        printf("Enter a Brand name ");
        gets_s(g[i].brand);
        printf("Enter the priece ");
        scanf("%f", &g[i].price);
        printf("Enter the quantity ");
        scanf("%d", &g[i].qty);
        printf("Enter the discount percent ");
        scanf("%f", &g[i].disc);

        g[i].cost = g[i].price * g[i].qty;
        g[i].discamt = g[i].cost * g[i].disc / (float)100;
        g[i].cwd = g[i].cost - g[i].discamt;

        *totalcost += (g[i].cost);
        *totaldisc += (g[i].disc);
        *totalcwd += (g[i].cwd);
    }
}

void sort(struct Grocery g[], int n)
{
    int i, j;
    Grocery t;
    for (i = 0; i < n - 1; i++)
        for (j = 0; j < n - 1; j++)
            if (strcmp(g[j].item, g[j + 1].item) > 0)
            {
                t = g[j];
                g[j] = g[j + 1];
                g[j + 1] = t;
            }
}


void print(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    for (int i = 0; i < n; i++)
    {
        printf("Item:%s\n", g[i].item);
    }
    printf("\nTotal cost is $%0.2f", totalcost);
    printf("\nTotal discount is $%0.2f", totaldisc);
    printf("\nTotal cost with discount is $%0.2f\n", totalcwd);

}

void savetext(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    FILE* f;
    f = fopen("d:\grocery.txt", "w");
    for (int i = 0; i < n; i++)
    {
        fprintf(f, "%s\n", g[i].item);
        fprintf(f, "%0.2f %0.2f %0.2f\n", totalcost, totaldisc, totalcwd);
    }
    fclose(f);
}

void retrievetext(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    FILE* f;
    int length;
    f = fopen("d:\grocery.txt", "r");
    for (int i = 0; i < n; i++)
    {
        fgets(g[i].item, sizeof(g[i].item), f);
        length = strlen(g[i].item);
        g[i].item[length - 1] = '\0';
        fscanf(f, "%0.2f %0.2f %0.2f\n", totalcost, totaldisc, totalcwd);
    }
    fclose(f);
}

void savebin(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    FILE* f;
    f = fopen("d:\grocery.bin", "wb");
    fwrite(&g, sizeof(g[0]), n, f);
    fclose(f);
}

void retrievebin(struct Grocery g[], float totalcost, float totaldisc, float totalcwd, int n)
{
    FILE* f;
    f = fopen("d:\grocery.bin", "rb");
    fread(&g, sizeof(g[0]), n, f);
    fclose(f);
}


void main()
{
    Grocery g[SIZE];
    float totalcost = 0, totaldisc = 0, totalcwd = 0;
    load(g, &totalcost, &totaldisc, &totalcwd, SIZE);
    sort(g, SIZE);
    print(g, totalcost, totaldisc, totalcwd, SIZE);
    savetext(g, totalcost, totaldisc, totalcwd, SIZE);
    retrievetext(g, totalcost, totaldisc, totalcwd, SIZE);
    printf("\n\nAfter the text file is retrieved\n\n");
    print(g, totalcost, totaldisc, totalcwd, SIZE);
    savebin(g, totalcost, totaldisc, totalcwd, SIZE);
    retrievebin(g, totalcost, totaldisc, totalcwd, SIZE);
    printf("\n\nAfter the text file is retrieved\n\n");
    print(g, totalcost, totaldisc, totalcwd, SIZE);
    system("PAUSE");
}