一个结构体的程序，出现错误，请帮忙排查 - C语言论坛

楼主

已结贴√ 问题点数：20 回复次数：2

一个结构体的程序，出现错误，请帮忙排查

想了很久没发现错在哪里，调用字串在功能函数里可以，一切正常，但返回到main里则提示错误，请帮忙找错，谢谢

程序代码：

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

typedef struct sdu {
    char name[24];
    char NO[24];
    int chengJi;
    struct sdu * next;
} SDU;
typedef SDU * PrtSDU;

void start(PrtSDU head);


int main(int argc, char **argv)
{
    PrtSDU head = NULL;
    start(head);
    printf("test head p = %p\n",&head);
    printf("%s\n",head->name);    //这里为错误点，我错在哪里呢？
    printf("%s\n",head->NO);
    printf("%d\n",head->chengJi);
    printf("all ok\n");
    return 0;
}

void start(PrtSDU head){
    head = (PrtSDU)malloc(sizeof(SDU));
    if (head != NULL){
        scanf("%s%s%d",head->name,head->NO,&head->chengJi);
        printf("test start ok , %s %s %d .\n",head->name,head->NO,head->chengJi);
        head->next = NULL;
    }else{
        printf("error\n");
    }
}

搜索更多相关主题的帖子: 结构体　 color　

#include <stdio.h> #include <stdlib.h> typedef struct sdu { char name[24]; char NO[24]; int chengJi; struct sdu * next; } SDU; typedef SDU * PrtSDU; void start(PrtSDU *head); //二级指针 int main(int argc, char **argv) { PrtSDU head = NULL; start(&head); //取地址 printf("test head p = %p\n",&head); printf("%s\n",head->name); printf("%s\n",head->NO); printf("%d\n",head->chengJi); printf("all ok\n"); return 0; } void start(PrtSDU *head){ *head = (PrtSDU)malloc(sizeof(SDU)); if (*head != NULL){ scanf("%s%s%d",(*head)->name,(*head)->NO,&(*head)->chengJi); printf("test start ok , %s %s %d .\n",(*head)->name,(*head)->NO,(*head)->chengJi); (*head)->next = NULL; }else{ printf("error\n"); } }