#include #include struct node{ int data; struct node*next; }; struct node*head; struct node*insert(int x){ struct node*a=(struct node*)malloc(sizeof(struct node)); a->data=x; a->next=NULL; return a; }; void insertathead(int x){ struct node*b=insert(x); if(head==NULL) { head=b; return; } b->next=head; head=b; }; void print(){ struct node*c=head; while(c->next!=NULL); { printf("%d\t",c->data); c=c->next; } return; }; int main (void) { head=NULL; insertathead(1); insertathead(2); insertathead(3); print(); return 0; }
循环条件改为while (c != NULL),可以打呀。你看下面的代码和运行结果。
#include <stdio.h>
#include <stdlib.h>
struct node {
int data;
struct node * next;
};
struct node * head;
struct node * insert(int x) {
//printf("Creating node for data %d\n", x);
struct node * a = (struct node * ) malloc(sizeof(struct node));
a -> data = x;
a -> next = NULL;
return a;
};
void insertathead(int x) {
struct node * b = insert(x);
if (head == NULL) {
//printf("Head is NULL. %d is head.\n", x);
head = b;
return;
}
//printf("Head is not NULL. %d is inserted to head.\n", x);
b -> next = head;
head = b;
};
void print() {
struct node * c = head;
while (c != NULL) {
printf("%d\t", c -> data);
c = c -> next;
}
return;
};
int main(void) {
head = NULL;
insertathead(1);
insertathead(2);
insertathead(3);
print();
return 0;
}
// Output
3 2 1
while(c->next!=NULL); 增加了分号,跟后面的语句就不是一体了,会死循环等待,因为条件一直不成立且不会变化
原因是while (c != NULL); 后面多了一个分号,形成了以各循环体为空的死循环。
while (c != NULL); {
printf("%d\t", c -> data);
c = c -> next;
}
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