Question

C语言用链表实现一元多项式的相加

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

typedef struct polynode
{
float coef;
int exp;
struct polynode *next;
}polynode,*PLinklist;

PLinklist Create(int n)
{
PLinklist L,p;
int i;
L=(PLinklist)malloc(sizeof(polynode));
L->next=NULL;
for(i=n;i>0;--i)
{
p=(PLinklist)malloc(sizeof(polynode));
scanf("%f %d",&p->coef,&p->exp);
p->next=L->next;
L->next=p;
}
return(L);
}

PLinklist Attach(float co,int ex,PLinklist o)
{
PLinklist c;
c=(PLinklist)malloc(sizeof(polynode));
c->coef=co;
c->exp=ex;
o->next=c;
return c;
}

PLinklist Print(PLinklist L)
{
int i=0;
PLinklist p=L;
while(p->next!=NULL)
{
i++;
printf("%fx^%d ",p->coef,p->exp);
p=p->next;
}
printf("\n");
}

PLinklist Add(PLinklist A,PLinklist B)
{
PLinklist C;
PLinklist o;
PLinklist p=A;
PLinklist q=B;
int sum;
C=(PLinklist)malloc(sizeof(polynode));
o=C;
while(p!=NULL&&q!=NULL)
{
if(p->exp==q->exp)
{
sum=p->coef+q->coef;
if(sum!=0)
o=Attach(sum,p->exp,o);
p=p->next;
q=q->next;
}

else if(p->exp<q->exp)
{
o=Attach(q->coef,q->exp,o);
q=q->next;
}
else{
o=Attach(p->coef,p->exp,o);
p=p->next;
}
}
while(p!=NULL)
{
o=Attach(p->coef,p->exp,o);
p=p->next;
}
while(q!=NULL)
{
o=Attach(q->coef,q->exp,o);
q=q->next;
}
o->next=NULL;
p=C;
C=C->next;
return C;
}

void main()
{
int n,m;
PLinklist *A,*B,*C;
printf("Input the length of A :\n");
scanf("%d",&n);
A=Create(n);
Print(A);
printf("Input the length of B :\n");
scanf("%d",&n);
b=Create(n);
Print(b);
C=Add(A,B);
Print(C);
}

这是我写的程序，弄了好久出不来，请高手看看吧

Answer 1

C语言代码：

#include "stdio.h"
#include "malloc.h"

/* 链表结点结构 */
typedef struct LNode{
    double coef;          /* 系数 */
    int exp;              /* 指数 */
    struct LNode *next;
}LNode;

/* 初始化链表 */
LNode *Init()
{
    LNode *head = (LNode*)malloc(sizeof(LNode));
    head->next = NULL;
    return head;
}

/* 将值为data的结点插入到head链表的最后 */
void AddNode(LNode *head, double coef, int exp)
{
    LNode *pre = head->next;
    LNode *temp;
    temp = (LNode*)malloc(sizeof(LNode));
    temp->coef = coef;
    temp->exp = exp;
    temp->next = NULL;
    
    if(pre == NULL)
    {
        head->next = temp;
        return;
    }
    for(; pre->next!=NULL; pre=pre->next);
    pre->next = temp;
}

/* 输出head链表的所有结点的值 */
void List(LNode *head)
{
    LNode *curr;
    printf("All nodes : ");
    for(curr=head->next; curr!=NULL; curr=curr->next)
    {
  printf("(%lf, %d)\t", curr->coef, curr->exp);
    }
    printf("\n");
}

/* 返回head链表的所有结点的数量 */
int Size(LNode *head)
{
    int len = 0;
    LNode *curr;
    for(curr=head->next; curr!=NULL; curr=curr->next,len++);
    return len;
}

LNode *Add(LNode *headA, LNode *headB)
{
    LNode *currA, *currB, *headC;
    double sum;
    currA = headA->next;
    currB = headB->next;
    headC = Init();
    while(currA!=NULL && currB!=NULL)
    {
        if(currA->exp > currB->exp)
        {
            AddNode(headC, currA->coef, currA->exp);
            currA = currA->next;
        }
        else if(currA->exp < currB->exp)
        {
            AddNode(headC, currB->coef, currB->exp);
            currB = currB->next;
        }
        else
        {
           sum = currA->coef + currB->coef;
           if(sum != 0)
           {
               AddNode(headC, sum, currA->exp);
           }
           currA = currA->next;
           currB = currB->next;
        }
    }
    while(currA != NULL)
    {
        AddNode(headC, currA->coef, currA->exp);
        currA = currA->next;
    }
    while(currB != NULL)
    {
        AddNode(headC, currB->coef, currB->exp);
        currB = currB->next;
    }
    return headC;
}

void main()
{
    LNode *headA, *headB, *headC;
 headA = Init();
 headB = Init();
    AddNode(headA, 1.0, 5);
    AddNode(headA, -1.0, 3);
    AddNode(headA, 1, 0);
    AddNode(headB, 0.5, 5);
    AddNode(headB, 1.0, 4);
    AddNode(headB, 1.0, 3);
    List(headA);
    List(headB);
    headC = Add(headA, headB);
    List(headC);
    
}

运行测试：

Answer 2

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

typedef struct polynode
{
float coef;
int exp;
struct polynode *next;
}polynode,*PLinklist;

PLinklist Create(int n)
{
PLinklist L,p;
int i;

L = (PLinklist)malloc(sizeof(polynode));
L->next = NULL;

for(i=n; i>0 ;--i)
{
p = (PLinklist)malloc(sizeof(polynode));
scanf("%f%d",&p->coef,&p->exp);
p->next = L->next;
L->next = p;
}

return(L);
}

PLinklist Attach(float co,int ex,PLinklist o)
{
PLinklist c;
c = (PLinklist)malloc(sizeof(polynode));
c->coef = co;
c->exp = ex;
o->next = c;
return c;
}

void Print(PLinklist L)
{
int i = 0;
PLinklist p = L;

while(p->next != NULL)
{
i++;
printf("%fx^%d ",p->coef,p->exp);
p=p->next;
}

printf("\n");
}

PLinklist Add(PLinklist A,PLinklist B)
{
PLinklist C;
PLinklist o;
PLinklist p = A;
PLinklist q = B;

float sum;

C = (PLinklist)malloc(sizeof(polynode));

o=C;

while((p != NULL) && (q != NULL))
{
if(p->exp == q->exp)
{
sum = p->coef+q->coef;
if(sum != 0)
o = Attach(sum,p->exp,o);
p = p->next;
q = q->next;
}

else if(p->exp < q->exp)
{
o = Attach(q->coef,q->exp,o);
q = q->next;
}
else{
o = Attach(p->coef,p->exp,o);
p = p->next;
}
}
while(p != NULL)
{
o = Attach(p->coef,p->exp,o);
p = p->next;
}
while(q != NULL)
{
o = Attach(q->coef,q->exp,o);
q = q->next;
}
o->next = NULL;
p = C;
C = C->next;
return C;
}

void main()
{
int n;
PLinklist A, B, C;
printf("Input the length of A :\n");
scanf("%d",&n);
A = Create(n);
Print(A);
printf("Input the length of B :\n");
scanf("%d",&n);
B = Create(n);
Print(B);
C = Add(A,B);
Print(C);
}

OK啦 ...帮你改了下细节部分，没改你实现思路....可以编译通过的

Answer 3

我写了一个 你看下

思路相同

#include "stdio.h"
#include "stdlib.h"
#define Null 0

typedef struct LNode
{
int coef;
int expn;
struct LNode *next;
}LNode,*Linklist;

void Creat(Linklist *L)
{
int i,j;
Linklist p,q;
(*L)=(Linklist)malloc(sizeof(LNode));
(*L)->coef=0;(*L)->next=Null;
p=*L;
scanf("%d,%d",&i,&j);
while(i!=0)
{
q=(Linklist)malloc(sizeof(LNode));
q->coef=i;q->expn=j;q->next=Null;
p->next=q;
p=q;
scanf("%d,%d",&i,&j);
}
}

void Add(Linklist La, Linklist Lb, Linklist *Lc)
{
Linklist pa=La->next,pb=Lb->next,pc;
*Lc=(Linklist)malloc(sizeof(LNode));
(*Lc)->coef=0;(*Lc)->next=Null;
pc=*Lc;
while(pa&&pb)
{
if(pa->expn<pb->expn)
{
pc->next=pa;
pc=pa;
pa=pa->next;
}
else
{
if(pa->expn>pb->expn)
{
pc->next=pb;
pc=pb;
pb=pb->next;
}
else
{
pa->coef=pa->coef+pb->coef;
pc=pa;
pa=pa->next;
pb=pb->next;
}
}
}
if(pa) pc->next=pa;
else pc->next=pb;
}

void Print(Linklist L)
{
Linklist p=L->next;
while(p)
{
printf("%d,%d\n",(int)p->coef,p->expn);
p=p->next;
}
}

int main()
{
Linklist La,Lb,Lc;
printf("Input the data of La:\n");
Creat(&La);
printf("Input the data of Lb:\n");
Creat(&Lb);
printf("\nLa:\n");
Print(La);
printf("\nLb:\n");
Print(Lb);
printf("\nAdd La and Lb to Lc:\n");
Add(La,Lb,&Lc);
Print(Lc);
printf("\n");
getch();
return 0;
}