我编写了一个简单的链表,但面临一个小问题。该程序就像通过用户接受名称,年龄和DOB,并为其动态分配内存。从用户处获取数据后,它正在搜索一个名称,并由用户询问该名称是否存在,应打印出与其相关的所有详细信息。 这里是我的代码 -C中的链接列表程序
//function declarations
struct node *initnode(char *, char *, char *);
void add(struct node *);
struct node *printnode(struct node *);
struct node *searchname(struct node *, char *);
struct node {
char name[25];
char age[10];
char dob[10];
struct node *next;
};
struct node *head = (struct node *) NULL;
struct node *initnode(char *name, char *age, char *dob1)
{
struct node *ptr;
ptr = (struct node *) malloc(sizeof(struct node));
if (ptr == NULL)
return (struct node *) NULL;
else {
strcpy(ptr->name, name);
strcpy(ptr->age, age);
strcpy(ptr->dob, dob1);
ptr->next = NULL;
return ptr;
}
}
struct node *printnode(struct node *ptr)
{
printf("Name -> %s\n", ptr->name);
printf("age -> %s \n", ptr->age);
printf("dob ->%s\n", ptr->dob);
return ptr;
}
void add(struct node *newp)
{
struct node *temp = (struct node *) malloc(sizeof(struct node));
if (head == NULL)
head = newp;
else {
for (temp = head; temp->next != NULL; temp = temp->next);
temp->next = newp;
temp = newp;
}
free(temp);
}
struct node *searchname(struct node *ptr, char *name1)
{
if (strcmp(name1, ptr->name) == 0) {
printf("\n name found \n");
printf("\n details are -\n");
printnode(ptr);
return ptr;
} else {
printf("\n name not found in the database \n");
}
}
int main()
{
char name[25];
char name1[25];
char rep;
char age[10];
char dob[10];
int i;
int flag = 1;
struct node *ptr;
do {
fflush(stdin);
while (flag != 0) {
printf("Enter name -- ");
gets(name);
for (i = 0; name[i] != '\0'; i++)
if (isdigit(name[i])) {
printf("Error in user input, name should be in alphabets\n");
flag = 1;
break;
}
else
flag = 0;
}
flag = 1;
while (flag != 0) {
printf("Enter age -- ");
scanf("%s", &age);
fflush(stdin);
for (i = 0; age[i] != '\0'; i++)
if (isalpha(age[i])) {
printf("Error in user input, age should be in numbers\n");
flag = 1;
break;
} else {
flag = 0;
}
}
flag = 1;
while (flag != 0) {
printf("Enter dob in DD/MM/YY format-- ");
scanf("%s", &dob);
fflush(stdin);
for (i = 0; dob[i] != '\0'; i++) {
if (isalpha(dob[i])) {
printf("Error in user input, dob should be in numbers\n");
flag = 1;
break;
} else
flag = 0;
}
}
flag = 1;
ptr = initnode(name, age, dob);
add(ptr);
printf("\n Do you want to continue?<Y/N>:\n ");
scanf("%s", &rep);
//rep = getchar();
}
while (rep == 'Y' || rep == 'y');
printf("\n do u want to search for a name in the database? <Y/N>:\n");
scanf("%s", &rep);
if (rep == 'Y' || rep == 'y') {
printf("Enter name you want to search-- ");
scanf("%s", &name1);
ptr = searchname(head, name1);
} else {
printf("\n goodbye \n");
}
do {
printf("\n do u want to search again? <Y/N>:\n");
scanf("%s", &rep);
if (rep == 'Y' || rep == 'y') {
printf("Enter name you want to search-- ");
scanf("%s", &name1);
ptr = searchname(head, name1);
} else {
printf("\n goodbye \n");
}
}
while (rep == 'Y' || rep == 'y');
return 0;
}
的问题是,它是搜索的第一个条目,而不是其他人,谁能帮助我理清这一点?我正在通过“gcc”进行编译。
不要调用`fflush`上`stdin` - 这导致未定义** Behavio(u)r ** - 查看`fflush`的手册页 - 它只能用于输出流。 – 2011-01-19 10:15:01
请重新格式化代码。 – Rozuur 2011-01-19 10:15:13
这是功课吗?如果是,那么你应该这样标记它。 – 2011-01-19 10:44:29