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if(s->data.coef!=0.0)

{

s->data.expn=p->data.expn;

r->next=s;

r=s;

}

p=p->next;

q=q->next;

break;

case 1:

s->data.coef=q->data.coef;

s->data.expn=q->data.expn;

r->next=s;

r=s;

q=q->next;

break;

}//switch

}//while

/*if(p!=NULL)

r->next=p;

else

if(q!=NULL)

r->next=q;

else

r->next=NULL;*/ //这样不行，q，p为局部变量，传不到主函数中去

while(p)

{

s=(LNode*)malloc(sizeof(LNode));

s->data.coef=p->data.coef;

s->data.expn=p->data.expn;

r->next=s;

r=s;

p=p->next;

}

while(q)

{

s=(LNode*)malloc(sizeof(LNode));

s->data.coef=q->data.coef;

s->data.expn=q->data.expn;

r->next=s;

r=s;

q=q->next;

}

r->next=NULL;

for(q=newp->next;q->next!=NULL;q=q->next)//合并同类项

for(p=q;p!=NULL&&p->next!=NULL;p=p->next)

if(q->data.expn==p->next->data.expn)

{

q->data.coef=q->data.coef+p->next->data.coef;

r=p->next;

p->next=p->next->next;

free(r);

}

return newp;

}

/*3、两多项式相减*/

polynomail subpolyn(polynomail pa,polynomail pb)

{

polynomail s,newp,q,p,r,Q;

p=pa->next;q=pb->next;

newp=(LNode*)malloc(sizeof(LNode));

r=newp;

while(p&&q)

{

s=(LNode*)malloc(sizeof(LNode));

switch(cmp(p->data,q->data))

{

case -1:

s->data.coef=p->data.coef;

s->data.expn=p->data.expn;

r->next=s;

r=s;

p=p->next;

break;

case 0:

s->data.coef=p->data.coef-q->data.coef;

if(s->data.coef!=0.0)

{

s->data.expn=p->data.expn;

r->next=s;

r=s;

}

p=p->next;

q=q->next;

break;

case 1:

s->data.coef=-q->data.coef;

s->data.expn=q->data.expn;

r->next=s;

r=s;

q=q->next;

break;

}//switch

}//while

while(p)

{

s=(LNode*)malloc(sizeof(LNode));

s->data.coef=p->data.coef;

s->data.expn=p->data.expn;

r->next=s;

r=s;

p=p->next;

}

while(q)

{

s=(LNode*)malloc(sizeof(LNode));

s->data.coef=-q->data.coef;

s->data.expn=q->data.expn;

r->next=s;

r=s;

q=q->next;

}

r->next=NULL;

if(newp->next!=NULL&&newp->next->next!=NULL)//合并同类项

{

for(q=newp->next;q!=NULL;q=q->next)

for(p=q->next,r=q;p!=NULL;)

if(q->data.expn==p->data.expn)

{

q->data.coef=q->data.coef+p->data.coef;

r->next=p->next;

Q=p;p=p->next;

free(Q);

}

else

{

r=r->next;

p=p->next;

}

}

return newp;

}

/*4、销毁已建立的两个多项式*/

void delpolyn(polynomail pa,polynomail pb)

{

polynomail p,q;

p=pa;

while(p!=NULL)

{

q=p;

p=p->next;

free(q);

}

p=pb;

while(p!=NULL)

{

q=p;

p=p->next;

free(q);

}

printf("两个多项式已经销毁\n");

}

void main()

{

polynomail pa=NULL,pb=NULL;

polynomail addp=NULL,subp=NULL,p,q;

int n,m;

char sign='y';

printf("1、创建两个一元多项式\n");

printf("2、两多项式相加得一新多项式\n");

printf("3、两多项式相减得一新多项式\n");

printf("4、销毁已建立的两个多项式\n");

printf("5、退出\n");

printf("\n");

while(sign!='n')

{

printf("请选择：");

scanf("%d",&n);

switch(n)

{

case 1:

if(pa!=NULL)

{

printf("已建立两个一元多项式，请选择其他操作！");

break;

}

printf("请输入第一个多项式：\n");

printf("要输入几项：");

scanf("%d",&m);

while(m==0)

{

printf("m不能为0，请重新输入m:");

scanf("%d",&m);

}

pa=creatpolyn(pa,m);

printpolyn(pa);

printf("请输入第二个多项式：\n");

printf("要输入几项：");

scanf("%d",&m);

pb=creatpolyn(pb,m);

printpolyn(pb);

break;

case 2:

if(pa==NULL)

{

printf("请先创建两个一元多项式！\n");

break;

}

addp=addpolyn(pa,pb);

printpolyn(addp);

break;

case 3:

if(pa==NULL)

{

printf("请先创建两个一元多项式！\n");

break;

}

subp=subpolyn(pa,pb);

printpolyn(subp);

break;

case 4:

if(pa==NULL)

{

printf("请先创建两个一元多项式！\n");

break;

}

delpolyn(pa,pb);

pa=pb=NULL;

break;

case 5:

if(addp!=NULL)

{

p=addp;

while(p!=NULL)

{

q=p;

p=p->next;

free(q);

}

}

if(subp!=NULL)

{

p=subp;

while(p!=NULL)

{

q=p;

p=p->next;

free(q);

}

}

exit(-2);

}//switch

}//while

}