應用單鏈表完成多項式盤算示例。本站提示廣大學習愛好者：（應用單鏈表完成多項式盤算示例）文章只能為提供參考，不一定能成為您想要的結果。以下是應用單鏈表完成多項式盤算示例正文
#include <stdio.h>
#include <stdlib.h>
//比擬函數前往值
#define A_EQUAL_B 0
#define A_LARGE_B 1
#define A_LOWER_B -1
//毛病前往之聚集
#define SUCCESS 0
#define POINT_ARG_IS_NULL -1
#define LINKLIST_IS_NULL -2
#define NOT_FOUND -3
typedef struct
{
int cst_term;//常數項
int idx_term;//指數
}factor;
typedef factor data_t;
typedef struct linklist
{
data_t data;
struct linklist *next;
}linklist;
/*
*
* malloc頭節點，頭節點內的數據是有效的
*
*/
linklist *creat_lnklst()
{
linklist *head = (linklist *)malloc(sizeof(linklist));
head->next = NULL;
return head;
}
/*
* pll是拔出節點的前一項
* data是數據
* 為新節點分派內存，以後拔出
*
*/
int ins_head_lnklst(linklist *pll, const data_t *data)
{
linklist *newnode = NULL;
if(NULL == pll || NULL == data)
return POINT_ARG_IS_NULL;
newnode = (linklist *)malloc(sizeof(linklist));
newnode->data = *data;
newnode->next = pll->next;
pll->next = newnode;
return SUCCESS;
}
/*
*
* pll是要刪除節點的前一個
* data寄存刪除的數據
* 檢討pll能否是空
* 檢討鏈表能否為空
* data是NULL就不消保留刪除的數據
*
*/
int del_head_lnklst(linklist *pll, data_t *data)
{
linklist *tmp = NULL;
if(NULL == pll)
return POINT_ARG_IS_NULL;
if(pll->next == NULL)
return LINKLIST_IS_NULL;
tmp = pll->next;
if(NULL != data)
*data = tmp->data;
pll->next = tmp->next;
free(tmp);
return SUCCESS;
}
/*
*
* 外部支撐data_t年夜小比擬函數
* 假如data_t修正成其他類型則須要修正此辦法
*
*/
static int cmp_data(const data_t *a, const data_t *b)
{
int res = 0;
if(a == NULL || b == NULL)
return POINT_ARG_IS_NULL;
res = a->idx_term - b->idx_term;
if(res == 0)
return A_EQUAL_B;
else if(res > 0)
return A_LARGE_B;
else
return A_LOWER_B;
}
/*
*
* 完成在鏈表中查找data婚配的前一項
* compare是完成虛擬數據類型比擬函數
*
*/
linklist * locate_lnklst(linklist *pll, const data_t *data, int (*compare)(const data_t *, const data_t *))
{
if(NULL == pll || data == NULL)
return NULL;
if(NULL == compare)
compare = cmp_data;
while(pll->next)
{
if(A_EQUAL_B == compare(&(pll->next->data), data))
return pll;
pll = pll->next;
}
return NULL;
}
/*
*
* 打印鏈表數據
* 檢討參數空指針
* 檢討空鏈表
*
*/
int print_lnklst(linklist *pll)
{
if(NULL == pll)
return POINT_ARG_IS_NULL;
if((pll = pll->next) == NULL)
{
printf("%s\n", "no element in linklist.\n");
return LINKLIST_IS_NULL;
}
while(pll)
{
if(pll->next == NULL)
{
printf("%2d*X^%1d ", pll->data.cst_term, pll->data.idx_term);
}
else
{
printf("%2d*X^%1d +", pll->data.cst_term, pll->data.idx_term);
}
pll = pll->next;
}
printf("\n");
return SUCCESS;
}
/*
*
* 刪除對應數據的節點
*
*/
int locate_del_lnklst(linklist *pll, const data_t *data)
{
linklist *prev = NULL;
if(NULL == pll || data == NULL)
return POINT_ARG_IS_NULL;
prev = locate_lnklst(pll, data, NULL);
if(NULL == prev)
return NOT_FOUND;
return del_head_lnklst(prev, NULL);
}
int add_linklist(linklist *a, linklist *b)
{
linklist *tmp;
if(NULL == a || NULL == b)
return POINT_ARG_IS_NULL;
if((b = b->next) == NULL)
{
return LINKLIST_IS_NULL;
}
while(b != NULL)
{
tmp = locate_lnklst(a, &b->data, NULL);
if(NULL == tmp)
ins_head_lnklst(a, &b->data);
else
tmp->next->data.cst_term += b->data.cst_term;
b = b->next;
}
return 0;
}
/*
*
* A = 1 + 2*X + 3*X^2
* B = 4 + 5*X + 6*X^2
* R = A + B
* = 5 + 7*X + 9*X^2
*
*/
int init_a_b(linklist *a, linklist *b)
{
factor tmp;
tmp.cst_term = 1;
tmp.idx_term = 0;
ins_head_lnklst(a, &tmp);
tmp.cst_term = 2;
tmp.idx_term = 1;
ins_head_lnklst(a, &tmp);
tmp.cst_term = 3;
tmp.idx_term = 2;
ins_head_lnklst(a, &tmp);
tmp.cst_term = 4;
tmp.idx_term = 0;
ins_head_lnklst(b, &tmp);
tmp.cst_term = 5;
tmp.idx_term = 1;
ins_head_lnklst(b, &tmp);
tmp.cst_term = 6;
tmp.idx_term = 2;
ins_head_lnklst(b, &tmp);
return 0;
}
int main(int argc, const char *argv[])
{
linklist *fml_a = creat_lnklst();
linklist *fml_b = creat_lnklst();
init_a_b(fml_a, fml_b);
printf("A =");
print_lnklst(fml_a);
printf("B =");
print_lnklst(fml_b);
add_linklist(fml_a, fml_b);
printf("A + B =");
print_lnklst(fml_a);
return 0;
}
