可以帮看一下这个代码吗

Question

问题遇到的现象和发生背景

遇到的现象和发生背景，请写出第一个错误信息

用代码块功能插入代码，请勿粘贴截图。 不用代码块回答率下降 50%

#define _CRT_SECURE_NO_WARNINGS
#include "stdio.h"
#include "stdlib.h"
#include "string.h"

#define N 3

typedef struct
{
    unsigned int day;    // should be checked against 28/29/30/31
    unsigned int month;    // considering using an enum type：January/February/... 
    unsigned int year;    // should be given a reasonable range
} DATE;

typedef struct
{
    char    ID[20];        // avoid using as an interger
    char    name[20];
    char    gender;        // considering using an enum type：M/F/O
    DATE    birthday;
    float    height;
    float    weight;
    float    BMI;
    char    BMI_grade[20];
} STAFF;

//BMI grading strings
const char* BMI_grade[5] = {
    "under Weight",
    "Normal",
    "Over Weight",
    "Obese",
    "Extremely Obese" };

int main(int argc, char* argv[])
{
    // function declarations
    int input(STAFF * p);
    int process(STAFF * p);
    int sort(STAFF * p);
    int output(STAFF * p);
    int save(char* filename, STAFF * p);

    //array definitions
    STAFF staff[N];
    char filename[20];

    // parameter processing
    if (argc != 2)
    {
        printf("Too many or few parameters provided!\n");
        printf("Usage: exp01.exe HealthCheck.txt\n");
        exit(0);
    }
    else
    {
        strcpy(filename, argv[1]);
    }

    // function calls
    input(staff);
    process(staff);
    sort(staff);
    output(staff);
    save(filename, staff);

    return 0;
}

int input(STAFF* p)
{
    printf("Stasff data inputting...\n");
    for (int i = 0; i < N; i++, p++)
    {
        setbuf(stdin, NULL); // to empty the keyboard file buffer

        printf("\nNow Please input the %d(th) person's data\n", i);

        printf("  ID: ");
        gets_s(p->ID);

        printf("  Name: ");
        gets_s(p->name);

        printf("  Gender(F/M): ");
        p->gender = getchar();
        while (p->gender != 'm' && p->gender != 'M' && p->gender != 'f' && p->gender != 'F')
        {
            printf("  Invalid gender input! Retry as (f/F/m/M): ");
            getchar();
            p->gender = getchar();
        }

        printf("  Birthday(year month day): ");
        scanf("%d%d%d",
            &(p->birthday.year),
            &(p->birthday.month),
            &(p->birthday.day));

        // The following codes can be further tuned to chenck the day element in a month-wise way
        while (p->birthday.year > 2000 ||
            p->birthday.year < 1950 ||
            p->birthday.month < 1 ||
            p->birthday.month > 12 ||
            p->birthday.day < 0 ||
            p->birthday.day   > 31)
        {
            printf("  Invalid month/day input! Retry Please : ");
            scanf("%d%d%d",
                &(p->birthday.year),
                &(p->birthday.month),
                &(p->birthday.day),50,50,50);
        }

        printf("  Height(cm): ");
        scanf_s("%f", &(p->height));

        printf("  Weight(kg): ");
        scanf_s("%f", &(p->weight));
    }
    printf("Stasff data inputting DONE\n");

    return 0;
}

int process(STAFF* p)
{
    printf("Stasff data processing...");
    for (int i = 0; i < N; i++, p++)
    {
        p->BMI = p->weight / p->height / p->height * 10000.0;

        if (p->BMI < 18.5)
            strcpy(p->BMI_grade, BMI_grade[0]);
        else if (p->BMI < 25.0)
            strcpy(p->BMI_grade, BMI_grade[1]);
        else if (p->BMI < 28.0)
            strcpy(p->BMI_grade, BMI_grade[2]);
        else if (p->BMI < 32.0)
            strcpy(p->BMI_grade, BMI_grade[3]);
        else
            strcpy(p->BMI_grade, BMI_grade[4]);
    }
    printf(" DONE\n");

    return 0;
}

int sort(STAFF* p)
{
    int i, j, k;
    STAFF temp;

    printf("Stasff data sorting...");
    for (i = 0; i < N - 1; i++)
    {
        k = i;
        for (j = i + 1; j < N; j++)
            if (p[j].BMI < p[k].BMI)
                k = j;
        if (k != i)
        {
            temp = p[i];
            p[i] = p[k];
            p[k] = temp;
        }
    }
    printf(" DONE\n");

    return 0;
}
int output(STAFF* p)
{
    printf("\nID\tName\tGender\tBirthday\tHeight(cm)\tWeight(kg)\tBMI\tBMI_Grade\n");
    for (int i = 0; i < N; i++, p++)
    {
        printf("%s\t%s\t%c\t%d-%d-%d\t%.2f\t%.2f\t%.2f\t%s\n",
            p->ID,
            p->name,
            p->gender,
            p->birthday.year,
            p->birthday.month,
            p->birthday.day,
            p->height,
            p->weight,
            p->BMI,
            p->BMI_grade
        );
    }

    return 0;
}
int save(char* filename, STAFF* p)
{
    FILE* fp;
    if ((fp = fopen(filename, "w")) == NULL)
    {
        printf("File open error.\n");
        exit(0);
    }

    printf("Stasff data saving...");
    fprintf(fp, "ID\tName\tGender\tBirthday\tHeight(cm)\tWeight(kg)\tBMI\tBMI_Grade\n");
    for (int i = 0; i < N; i++, p++)
    {
        fprintf(fp, "%s\t%s\t%c\t%d-%d-%d\t%.2f\t%.2f\t%.2f\t%s\n",
            p->ID,
            p->name,
            p->gender,
            p->birthday.year,
            p->birthday.month,
            p->birthday.day,
            p->height,
            p->weight,
            p->BMI,
            p->BMI_grade
        );
    }
    printf(" DONE\n");

    fclose(fp);

    return 0;
}

运行结果及详细报错内容

打开调试一会就自动关掉了，scanf显示返回值被忽略

我的解答思路和尝试过的方法，不写自己思路的，回答率下降 60%

我想要达到的结果，如果你需要快速回答，请尝试 “付费悬赏”

Answer 1

112行的3个50可以删了。
返回值被忽略可以被忽略