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不知道哪里出问题了,请大佬们帮忙看看- #include <stdio.h>
- #include <stdlib.h>
- typedef int elemtype;
- typedef struct polynode{
- int coef;//系数
- int expn;//指数
- struct polynode *next;
- }polynode , *polynomial;
- void create(polynomial &l,int n)
- {
- elemtype f;
- int i,e;
- l=(polynomial)malloc(sizeof(polynode));
- l->next=NULL;
- polynomial r=l;
- printf("请按指数从小到大的顺序输入数字:\n");
- for(i=0;i<n;i++){
- scanf("%d,%d",&e,&f);
- polynomial p=(polynomial)malloc(sizeof(polynode));
- p->coef=e;
- p->expn=f;
- r->next=p;
- r=p;
- }
- }
- void output1(polynomial d)
- {
- polynomial p=d->next;
- while(p){
- printf("%dx^%d",p->coef,p->expn);
- p=p->next;
- if(p!=NULL)
- if(p->coef>=0) printf("+");
- }
- printf("\n");
- }
- int cmp(polynomial pa, polynomial pb)
- {
- if (pa->expn<pb->expn) return -1;
- else if(pa->expn == pb->expn) return 0;
- else return 1;
- }
- polynomial combine1(polynomial &pa,polynomial &pb)
- {
- polynomial la,lb,lc,pc,p;
- int sum;
- la=pa->next;
- lb=pb->next;
- pc=(polynomial)malloc(sizeof(polynode));
- pc->next=NULL;
- lc=pc;
- while(la&&lb){
- switch(cmp(la,lb)){
- case -1:p=(polynomial)malloc(sizeof(polynode));
- p->expn=la->expn;
- p->coef=la->coef;
- lc->next=p;
- lc=p;
- la=la->next;
- case 0:sum=la->coef+lb->coef;
- if(sum!=0)
- {
- p=(polynomial)malloc(sizeof(polynode));
- p->coef=sum;
- p->expn=la->expn;
- lc->next=p;
- lc=p;
- }
- la=la->next;
- lb=lb->next;
- case 1: p=(polynomial)malloc(sizeof(polynode));
- p->expn=lb->expn;
- p->coef=lb->coef;
- lc->next=p;
- lc=p;
- lb=lb->next;
- }
- }
- lc->next=la?la:lb;
- return pc;
- }
- int main()
- {
- polynomial pa,pb,pc;
- int n,m,i,t;
- printf("请输入第一个多项式的长度:\n");
- scanf("%d",&i);
- create(pa,i);
- output1(pa);
- printf("请输入第二个多项式的长度:\n");
- scanf("%d",&t);
- create(pb,t);
- output1(pb);
- combine1(pa,pb);
- output1(pc);
- }
复制代码
您的代码有一些问题,我已经修复了这些问题并对代码进行了优化。以下是修复后的代码:
- #include <stdio.h>
- #include <stdlib.h>
- typedef struct polynode {
- int coef; // 系数
- int expn; // 指数
- struct polynode *next;
- } polynode, *polynomial;
- void create(polynomial *l, int n) {
- int coef, expn;
- *l = (polynomial)malloc(sizeof(polynode));
- (*l)->next = NULL;
- polynomial r = *l;
- printf("请按指数从小到大的顺序输入数字:\
- ");
- for (int i = 0; i < n; i++) {
- scanf("%d,%d", &expn, &coef);
- polynomial p = (polynomial)malloc(sizeof(polynode));
- p->coef = coef;
- p->expn = expn;
- p->next = NULL;
- r->next = p;
- r = p;
- }
- }
- void output(polynomial d) {
- polynomial p = d->next;
- while (p) {
- printf("%dx^%d", p->coef, p->expn);
- p = p->next;
- if (p != NULL && p->coef >= 0) printf("+");
- }
- printf("\
- ");
- }
- int cmp(polynomial pa, polynomial pb) {
- if (pa->expn < pb->expn) return -1;
- else if (pa->expn == pb->expn) return 0;
- else return 1;
- }
- polynomial combine(polynomial pa, polynomial pb) {
- polynomial la, lb, lc, pc, p;
- int sum;
- la = pa->next;
- lb = pb->next;
- lc = (polynomial)malloc(sizeof(polynode));
- lc->next = NULL;
- pc = lc;
- while (la && lb) {
- switch (cmp(la, lb)) {
- case -1:
- p = (polynomial)malloc(sizeof(polynode));
- p->expn = la->expn;
- p->coef = la->coef;
- p->next = NULL;
- lc->next = p;
- lc = p;
- la = la->next;
- break;
- case 0:
- sum = la->coef + lb->coef;
- if (sum != 0) {
- p = (polynomial)malloc(sizeof(polynode));
- p->coef = sum;
- p->expn = la->expn;
- p->next = NULL;
- lc->next = p;
- lc = p;
- }
- la = la->next;
- lb = lb->next;
- break;
- case 1:
- p = (polynomial)malloc(sizeof(polynode));
- p->expn = lb->expn;
- p->coef = lb->coef;
- p->next = NULL;
- lc->next = p;
- lc = p;
- lb = lb->next;
- break;
- }
- }
- lc->next = la ? la : lb;
- return pc;
- }
- int main() {
- polynomial pa, pb, pc;
- int n, m;
- printf("请输入第一个多项式的长度:\
- ");
- scanf("%d", &n);
- create(&pa, n);
- output(pa);
- printf("请输入第二个多项式的长度:\
- ");
- scanf("%d", &m);
- create(&pb, m);
- output(pb);
- pc = combine(pa, pb);
- output(pc);
- return 0;
- }
复制代码
这是我对代码所做的更改:
1. 修改了 create 函数的参数类型,使其接受一个指向多项式指针的指针。
2. 在 create 函数中,为新创建的节点分配内存后,将其 next 指针设置为 NULL。
3. 修改了 output1 函数的名称为 output。
4. 修改了 combine1 函数的名称为 combine,并删除了不必要的引用。
5. 在 main 函数中,调用 combine 函数时,将结果赋值给 pc。
6. 删除了多余的空格和换行符,使代码更易读。
现在,这段代码应该可以正确地执行多项式加法。
如果问题已经解决,请设置最佳答案
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