q=p=head; printf("input deleted letter"); scanf("%c",&ch); while(ch != '0') 我又加了个循环的，老是死循环`````哪里错了`````？？？ { while(p->lk != ch && p->next != NULL) {q=p; p=p->next;} if(p==head) head=head->next; else q->next=p->next; free(p) ; p=head;

while (p->next != NULL)

{ printf("%c ",p->lk); p=p->next; } printf("\n");

printf("2:input deleted letter"); scanf("%c",&ch);

}

}

#include <stdio.h> #define len sizeof(struct a) #define NULL 0

struct a {char lk; struct a *next ; };

main() {struct a *head,*p,*q; int i; char ch;

head=p=(struct a *) malloc(len);

for(i=1;i<=26;i++) {(p->lk)=('a'+i-1); p->next=(struct a *)malloc(len); p=p->next;

} p->next=NULL;

p=head; while (p->next != NULL)

{ printf("%c ",p->lk); p=p->next; } printf("\n");

q=p=head; printf("input deleted letter:"); scanf("%c",&ch); while(ch != '0') { while(p->lk != ch && p->next != NULL) {q=p; p=p->next;} if(p==head) head=head->next; else q->next=p->next; free(p) ; p=head;

while (p->next != NULL)

{ printf("%c ",p->lk); p=p->next; } /* printf("\n"); */

q=p=head;

printf("2:input deleted letter"); scanf("%c",&ch);

}

} 我又改成这样了 如果 输入a ，它把a和z都删了 输入b，它把b和y都删了```