链表创建输入和打印出现乱码

Question

在VS2022中创建了一个链表，但是测试时发现输入数据次数不对而且输出是是乱码，但是已经验证相同写法的另一链表存入数据和打印都正常，这是什么原因呢？

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
struct app
{
    char gender;
    int agemin;
    int agemax;
    long incomemin;
    long incomemax;
    struct app* next;
};
int main()
{
    int i, m;
    scanf("%d", &m);
    struct app* ahead = NULL;
    struct app* acur;
    struct app* aprev = NULL;
    for (i = 0; i < m; i++)
    {
        acur = (struct app*)malloc(sizeof(struct app));
        if (ahead == NULL)
            ahead = acur;
        else
            aprev->next = acur;
        acur->next = NULL;
        scanf("%c %d %d %ld %ld", &(acur->gender), &(acur->agemin), &(acur->agemax), &(acur->incomemin), &(acur->incomemax));        
        aprev = acur;
    }
    acur = ahead;
    for (i = 0; i < m; i++)
    {
        printf("%c %d %d %ld %ld", acur->gender, acur->agemin, acur->agemax, acur->incomemin, acur->incomemax);
        acur = acur->next;
        printf("\n");
    }
    acur = ahead;
    while (acur != NULL)
    {
        acur = ahead;
        ahead = acur->next;
        free(acur);
        acur = acur->next;
    }
    return 0;
}

下面是运行结果

Answer 1

这不是乱码，数据未正确被赋值，程序打印了未知的数据

原因是 你的 %c 接受了 换行符，导致后续的数据接收都有问题

先看截图：

改造如下：

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
struct app
{
    char gender;
    int agemin;
    int agemax;
    long incomemin;
    long incomemax;
    struct app* next;
};
int main()
{
    int i, m;
    scanf("%d", &m);
    struct app* ahead = NULL;
    struct app* acur;
    struct app* aprev = NULL;
    for (i = 0; i < m; i++)
    {
        acur = (struct app*)malloc(sizeof(struct app));
        if (ahead == NULL)
            ahead = acur;
        else
            aprev->next = acur;
        acur->next = NULL;
        getchar(); // 接收一下换行符
        scanf("%c %d %d %ld %ld", &(acur->gender), &(acur->agemin), &(acur->agemax), &(acur->incomemin), &(acur->incomemax));        
        aprev = acur;
    }
    acur = ahead;
    for (i = 0; i < m; i++)
    {
        printf("%c %d %d %ld %ld", acur->gender, acur->agemin, acur->agemax, acur->incomemin, acur->incomemax);
        acur = acur->next;
        printf("\n");
    }
    acur = ahead;
    while (acur != NULL)
    {
        acur = ahead;
        ahead = acur->next;
        free(acur);
        acur = acur->next;
    }
    return 0;
}