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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <locale.h>
#define MAX_TERMS 20 // 最大项数
#define MAX_LENTH_OF_LINE 1024 // 记事本一行最多字符数
#define MAX_POLYS 100 // 多项式最大个数
#define FILENAME "polysFile.txt" // 需读取文件的名称
#define FILENAME_OUTPUT "polysRusult.txt" // 需写入文件的名称
int SerialNumber; // 全局变量，用于写入文件的序号
// 多项式项的结构体
typedef struct PolyNode
{
int coef; // 系数
int exp; // 指数
struct PolyNode* next;
} PolyNode;
PolyNode* createPoly(); // 创建一个空的多项式
void insertTerm(PolyNode* poly, int coef, int exp); // 插入多项式项到链表中，按指数降序排列
void simplifyPoly(PolyNode *poly); // 合并同类项
void freePoly(PolyNode *poly); // 释放多项式链表的内存
void printPoly(PolyNode* poly, int flag); // 打印多项式
void printAllPoly(PolyNode* poly[],int polysNum); // 输出现有的全部多项式
void readPolyFromFile(const char* filename, PolyNode* poly, int line); // 从文件中读取多项式
void writePolyToFile(PolyNode* poly, const char* filename); // 将多项式写入文件
void inputPoly(PolyNode* poly); // 输入一个新的多项式
void deletePoly(PolyNode* poly[],int polySum); // 删除一个已存在的多项式
void addItem(PolyNode* poly[],int polysNum); // 添加单项
PolyNode* addPoly(PolyNode* poly[],int polysNum); // 多项式加法
PolyNode* subtractPoly(PolyNode* poly[],int polysNum); // 多项式减法
PolyNode* multiplyPoly(PolyNode* poly[],int polysNum); // 多项式乘法
PolyNode* polyDerivative(PolyNode* poly[],int polysNum); // 多项式求导
int evaluatePoly(PolyNode* poly[],int polysNum); // 计算多项式在x处的值
int Cchoice(int maxChoice); // 菜单选择界面
int initSerialNumber(); // 读取结果文件中的编号
int main();
// 创建一个空的多项式
PolyNode* createPoly()
{
PolyNode* head = (PolyNode*)malloc(sizeof(PolyNode));
head->next = NULL;
return head;
}
// 插入多项式项到链表中，按指数降序排列
void insertTerm(PolyNode* poly, int coef, int exp)
{
if(coef == 0) return;
PolyNode* newTerm = (PolyNode*)malloc(sizeof(PolyNode));
newTerm->coef = coef;
newTerm->exp = exp;
newTerm->next = NULL;
PolyNode* current = poly;
while (current->next != NULL && current->next->exp > exp)
{
current = current->next;
}
if (current->next != NULL && current->next->exp == exp)
{
// 如果指数相同，合并项
current->next->coef += coef;
free(newTerm);
}
else
{
newTerm->next = current->next;
current->next = newTerm;
}
}
// 合并多项式中的同类项
void simplifyPoly(PolyNode *poly) {
PolyNode *current = poly->next;
while (current != NULL) {
PolyNode *nextTerm = current->next;
PolyNode *prevTerm = current;
if (prevTerm->coef == 0)
{
free(prevTerm);
prevTerm = nextTerm;
nextTerm = prevTerm->next;
}
while (nextTerm != NULL) {
if (current->exp == nextTerm->exp) {
// 合并同类项
current->coef += nextTerm->coef;
prevTerm->next = nextTerm->next;
free(nextTerm);
nextTerm = prevTerm->next;
} else {
prevTerm = nextTerm;
nextTerm = nextTerm->next;
}
}
current = current->next;
}
}
// 释放多项式链表的内存
void freePoly(PolyNode *poly) {
PolyNode *current = poly;
while (current != NULL) {
PolyNode* nextNode = current->next;
free(current);
current = nextNode;
}
}
// 打印多项式，输出格式：系数x^指数，如果指数为0，则输出系数；如果指数为1，输出x
void printPoly(PolyNode* poly,int flag)
{
PolyNode* current = poly->next;
if (current == NULL)
{
printf("多项式不存在。\n");
return;
}
while (current != NULL)
{
if (current->coef > 0 && current != poly->next)
{
printf("+");
}
// 系数为0,不存在的项
if (current -> coef == 0)
{
current = current->next;
continue;
}
// 处理x^0的情况
if (current->exp == 0)
{
printf("%d", current->coef);
}
// 处理-1x^1的情况
else if (current->exp == 1&¤t->coef == -1)
{
printf("-x");
}
// 处理1x^1的情况
else if (current->exp == 1&¤t->coef == 1)
{
printf("x");
}
// 处理其他x^1
else if (current->exp == 1)
{
printf("%dx", current->coef);
}
// 处理系数为1的情况
else if (current->coef == 1)
{
printf("x^%d", current->exp);
}
// 处理系数为-1的情况
else if (current->coef == -1)
{
printf("-x^%d", current->exp);
}
// 其他指数的情况
else
{
printf("%dx^%d", current->coef, current->exp);
}
current = current->next;
}
if (flag == 1)
printf("\n");
}
// 输出现有的全部多项式
void printAllPoly(PolyNode* poly[],int polysNum)
{
int i;
printf("当前已有的%d个多项式如下：\n", polysNum);
for (i = 1; i <= polysNum; i++)
{
printf("%d：",i);
printPoly(poly[i-1],1);
}
}
// 从文件中读取多项式
void readPolyFromFile(const char* filename, PolyNode* poly, int line)
{
FILE* file = fopen(filename, "r");
if (file == NULL)
{
printf("无法打开文件 %s\n", filename);
return;
}
// 从指定第line行(line从1开始)开始读取
for (int i = 1; i < line; i++)
{
char line[MAX_LENTH_OF_LINE];
fgets(line, MAX_LENTH_OF_LINE, file);
}
int coef = 0, exp = 0;
char ch;
while ((ch = fgetc(file)) != EOF)
{
// 检查是否遇到换行符，遇到换行符自动停止读取
if (ch == '\n')
{
break;
}
//第一项系数为1的情况
if (ch == 'x')
{
ch = fgetc(file);
if (ch == '^')
{
fscanf(file, "%d", &exp);
}
else
{
ungetc(ch, file);
exp = 1;
}
insertTerm(poly, 1, exp);
}
// 检查是否遇到数字或符号（+ 或 -），开始读取系数
if (ch == '+' || ch == '-')
{
if (ch == '+') coef = 1;
else coef = -1;
ungetc(ch, file);
if (!fscanf(file, "%d", &coef))
{
ch = fgetc(file);
if (ch == 'x')
{
ch = fgetc(file);
if (ch == '^')
{
fscanf(file, "%d", &exp); // 如果后面跟着^，则读取指数
}
else
{
ungetc(ch, file); // 如果没有^，说明指数是1
exp = 1;
}
insertTerm(poly, coef, exp);
continue;
}
}
}
if (isdigit(ch))
{
ungetc(ch, file);
fscanf(file, "%d", &coef);
}
// 继续读取字符
ch = fgetc(file);
// 处理是否包含'x'，并决定指数
if (ch == 'x')
{
ch = fgetc(file);
if (ch == '^')
{
fscanf(file, "%d", &exp); // 如果后面跟着^，则读取指数
}
else
{
ungetc(ch, file); // 如果没有^，说明指数是1
exp = 1;
}
}
else
{
ungetc(ch, file); // 如果没有x，说明是常数项，指数为0
exp = 0;
}
// 将解析的项插入到多项式中
insertTerm(poly, coef, exp);
}
fclose(file);
}
// 将多项式写入文件，格式：系数x^指数，如果指数为0，则输出系数；如果指数为1，输出x
void writePolyToFile(PolyNode* poly, const char* filename)
{
FILE* file = fopen(filename, "a");
if (file == NULL)
{
printf("无法打开文件 %s\n", filename);
return;
}
PolyNode* current = poly->next;
int isFirst = 1;
while (current != NULL)
{
// 如果不是第一个项并且系数大于0，则需要添加 +
if (!isFirst && current->coef > 0)
{
fprintf(file, "+");
}
// 系数为0，不写入
if (current->coef == 0)
{
current = current->next;
continue;
}
// 写入系数和指数
if (current->exp == 0)
{
fprintf(file, "%d", current->coef); // 如果指数为0，直接输出系数
}
else if (current->exp == 1)
{
if (current->coef == 1)
fprintf(file, "x"); // 如果指数、系数为1，输出 "x"
fprintf(file, "%dx", current->coef); // 如果指数为1，输出 "coefx"
}
else if (current->coef == 1)
{
fprintf(file, "x^%d", current->exp); // 如果系数为1，输出x^exp
}
else if (current->coef == -1)
{
if (current->exp == 1)
fprintf(file, "-x"); // 如果系数为-1,指数为1，输出-x
else fprintf(file, "-x^%d", current->exp); // 如果系数为-1，输出-x^exp
}
else
{
fprintf(file, "%dx^%d", current->coef, current->exp); // 其他情况输出 "coef x^exp"
}
current = current->next;
isFirst = 0;
}
fclose(file);
}
// 多项式加法
PolyNode* addPoly(PolyNode* poly[],int polysNum)
{
PolyNode* result = createPoly();
int ch1,ch2;
printAllPoly(poly,polysNum);
printf("输入要相加的两个多项式（两个数字中间由空格隔开,输入-1取消）：\n");
scanf("%d %d",&ch1,&ch2);
if (ch1 == -1||ch2 == -1) return NULL;
PolyNode *p1 = poly[ch1-1]->next, *p2 = poly[ch2-1]->next;
while (p1 != NULL && p2 != NULL)
{
if (p1->exp > p2->exp)
{
insertTerm(result, p1->coef, p1->exp);
p1 = p1->next;
}
else if (p1->exp < p2->exp)
{
insertTerm(result, p2->coef, p2->exp);
p2 = p2->next;
}
else
{
int sum = p1->coef + p2->coef;
if (sum != 0)
{
insertTerm(result, sum, p1->exp);
}
p1 = p1->next;
p2 = p2->next;
}
}
// 插入剩余项
while (p1 != NULL)
{
insertTerm(result, p1->coef, p1->exp);
p1 = p1->next;
}
while (p2 != NULL)
{
insertTerm(result, p2->coef, p2->exp);
p2 = p2->next;
}
printf("结果如下：");
printf("(");
printPoly(poly[ch1-1],0);
printf(") + (");
printPoly(poly[ch2-1],0);
printf(") = ");
printPoly(result,1);
printf("是否将其写入结果文件（%s）中？y/n",FILENAME_OUTPUT);
fflush(stdin);
if (getchar() == 'y'||getchar() == 'Y')
{
FILE* file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "%d.多项式加法:(", SerialNumber);
fclose(file);
writePolyToFile(poly[ch1-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") + (");
fclose(file);
writePolyToFile(poly[ch2-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") = ");
fclose(file);
writePolyToFile(result,FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "\n");
fclose(file);
SerialNumber++;
printf("写入成功！\n");
system("pause");
}
return result;
}
// 多项式减法
PolyNode* subtractPoly(PolyNode* poly[],int polysNum)
{
PolyNode* result = createPoly();
int ch1,ch2;
printAllPoly(poly,polysNum);
printf("输入要相减的两个多项式（两个数字中间由空格隔开,输入-1取消）：\n");
scanf("%d %d",&ch1,&ch2);
if (ch1 == -1||ch2 == -1) return NULL;
PolyNode *p1 = poly[ch1-1]->next, *p2 = poly[ch2-1]->next;
while (p1 != NULL && p2 != NULL)
{
if (p1->exp > p2->exp)
{
insertTerm(result, p1->coef, p1->exp);
p1 = p1->next;
}
else if (p1->exp < p2->exp)
{
insertTerm(result, -p2->coef, p2->exp);
p2 = p2->next;
}
else
{
int diff = p1->coef - p2->coef;
if (diff != 0)
{
insertTerm(result, diff, p1->exp);
}
p1 = p1->next;
p2 = p2->next;
}
}
// 插入剩余项
while (p1 != NULL)
{
insertTerm(result, p1->coef, p1->exp);
p1 = p1->next;
}
while (p2 != NULL)
{
insertTerm(result, -p2->coef, p2->exp);
p2 = p2->next;
}
printf("结果如下：");
printf("(");
printPoly(poly[ch1-1],0);
printf(") - (");
printPoly(poly[ch2-1],0);
printf(") = ");
printPoly(result,1);
printf("是否将其写入结果文件（%s）中？y/n",FILENAME_OUTPUT);
fflush(stdin);
if (getchar() == 'y'||getchar() == 'Y')
{
FILE* file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "%d.多项式减法:(", SerialNumber);
fclose(file);
writePolyToFile(poly[ch1-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") - (");
fclose(file);
writePolyToFile(poly[ch2-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") = ");
fclose(file);
writePolyToFile(result,FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "\n");
fclose(file);
SerialNumber++;
printf("写入成功！\n");
system("pause");
}
return result;
}
// 多项式乘法
PolyNode* multiplyPoly(PolyNode* poly[], int polysNum)
{
PolyNode* result = createPoly();
int ch1,ch2;
printAllPoly(poly,polysNum);
printf("输入要相乘的两个多项式（两个数字中间由空格隔开,输入-1取消）：\n");
scanf("%d %d",&ch1,&ch2);
if (ch1 == -1||ch2 == -1) return NULL;
PolyNode *p1 = poly[ch1-1]->next, *p2 = poly[ch2-1]->next;
PolyNode *tem = p2;
while (p1 != NULL)
{
p2 = tem;
while (p2 != NULL)
{
int coef = p1->coef * p2->coef;
int exp = p1->exp + p2->exp;
insertTerm(result, coef, exp);
p2 = p2->next;
}
p1 = p1->next;
}
printf("结果如下：");
printf("(");
printPoly(poly[ch1-1],0);
printf(") * (");
printPoly(poly[ch2-1],0);
printf(") = ");
printPoly(result,1);
printf("是否将其写入结果文件（%s）中？y/n",FILENAME_OUTPUT);
fflush(stdin);
if (getchar() == 'y'||getchar() == 'Y')
{
FILE* file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "%d.多项式乘法:(", SerialNumber);
fclose(file);
writePolyToFile(poly[ch1-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") * (");
fclose(file);
writePolyToFile(poly[ch2-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, ") = ");
fclose(file);
writePolyToFile(result,FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "\n");
fclose(file);
SerialNumber++;
printf("写入成功！\n");
system("pause");
}
return result;
}
// 计算多项式在x处的值
int evaluatePoly(PolyNode* poly[], int polysNum)
{
printAllPoly(poly,polysNum);
printf("输入要计算的多项式：（范围1~%d,输入0或-1取消）",polysNum);
fflush(stdin);
int ch;
scanf("%d",&ch);
if (ch == 0||ch == -1) return 0;
int result = 0;
PolyNode* current = poly[ch-1]->next;
fflush(stdin);
int x;
printf("输入需要计算的x的值：");
scanf("%d",&x);
while (current != NULL)
{
int termValue = current->coef;
for (int i = 0; i < current->exp; i++)
{
termValue *= x;
}
result += termValue;
current = current->next;
}
printf("结果如下：\n");
printf("当x = %d 时，",x);
printPoly(poly[ch-1],0);
printf(" = %d",result);
printf("是否将其写入结果文件（%s）中？y/n",FILENAME_OUTPUT);
fflush(stdin);
if (getchar() == 'y'||getchar() == 'Y')
{
FILE* file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, "%d.多项式求值: 当x = %d 时，", SerialNumber,x);
fclose(file);
writePolyToFile(poly[ch-1],FILENAME_OUTPUT);
file = fopen(FILENAME_OUTPUT, "a");
fprintf(file, " = %d\n",result);
fclose(file);
SerialNumber++;
printf("写入成功！\n");
system("pause");
}
return result;
}
// 输入一个新的多项式
void inputPoly(PolyNode* poly)
{
fflush(stdin); //清空输入缓存区
int coef=0, exp;
char input[100];
printf("输入的多项式格式为：系数+（空格）+指数，或者系数x^指数（支持书面写法,例如： x ->系数，指数均为1）,每次输入其中一项，输入0 0结束\n");
while (1)
{
fgets(input, sizeof(input), stdin); // 获取用户输入
// 去除输入字符串末尾的换行符
input[strcspn(input, "\n")] = 0;
// 如果输入是 "0 0"，结束输入
if (strcmp(input, "0 0") == 0)
{
printf("你输入的多项式为：");
printPoly(poly,1);
system("pause");
break;
}
// 尝试解析 "系数x^指数" 格式
if (strchr(input, 'x') != NULL)
{
int coef, exp;
if (sscanf(input, "%dx^%d", &coef, &exp) == 2)
{
insertTerm(poly, coef, exp);
}
else if (sscanf(input, "%dx", coef) == 1)
{
insertTerm(poly, coef, 1);
}
else if (sscanf(input, "%d", coef) == 1)
{
insertTerm(poly, coef, 0);
}
else if (sscanf(input, "x^%d", exp) == 1)
{
insertTerm(poly, 1, exp);
}
else if (sscanf(input, "-x^%d", exp) == 1)
{
insertTerm(poly, -1, exp);
}
else if (input[0] == 'x')
{
insertTerm(poly, 1, 1);
}
else
{
printf("输入格式错误！请重新输入。\n");
}
}
// 尝试解析 "系数 指数" 格式
else if (sscanf(input, "%d %d", &coef, &exp) == 2)
{
if (coef == 0 && exp == 0)
{
break;
}
insertTerm(poly, coef, exp);
}
else
{
printf("输入格式错误！请重新输入。\n");
}
}
}
// 多项式求导
PolyNode* polyDerivative(PolyNode* poly[],int polysNum)
{
PolyNode* result = createPoly();
int ch;
printAllPoly(poly,polysNum);
printf("输入要求导的多项式（输入0或-1取消）：\n");
fflush(stdin);
scanf("%d",&ch);
if (ch == -1||ch == 0) return NULL;
PolyNode *p1 = poly[ch-1]->next;
while (p1 != NULL)
{
if (p1->exp == 0) // 系数为0，求导无结果
{
p1 = p1->next;
continue;
}
// 系数不为0的情况
int coef = p1->coef * p1->exp;
int exp = p1->exp - 1;
insertTerm(result, coef, exp);
p1 = p1->next;
}
printf("结果如下：");
printPoly(poly[ch-1],0);
printf(" -> ");
printPoly(result,1);
printf("是否将其写入结果文件（polysRusult.txt）中？y/n");
fflush(stdin);
if (getchar() == 'y'||getchar() == 'Y')
{
FILE* file = fopen("polysRusult.txt", "a");
fprintf(file, "%d.多项式求导:", SerialNumber);
fclose(file);
writePolyToFile(poly[ch-1],FILENAME_OUTPUT);
file = fopen("polysRusult.txt", "a");
fprintf(file, " -> ");
fclose(file);
writePolyToFile(result,FILENAME_OUTPUT);
file = fopen("polysRusult.txt", "a");
fprintf(file, "\n");
fclose(file);
SerialNumber++;
printf("写入成功！\n");
system("pause");
}
return result;
}
// 菜单选择界面
int Cchoice(int maxChoice)
{
int input;
printf("请输入你的选择：范围（1~%d）,输入0返回",maxChoice);
fflush(stdin);
scanf("%d",&input);
while (input < 0 || input > maxChoice)
{
fflush(stdin);
printf("输入的选项有误！请重新输入：范围（1~%d）,输入0返回/n",maxChoice);
scanf("%d",&input);
}
return input;
}
// 删除一个已存在的多项式
void deletePoly(PolyNode* poly[],int polySum)
{
fflush(stdin);
printAllPoly(poly, polySum);
int choice=Cchoice(polySum);
for (int i = choice-1; i < polySum-1; i++)
{
poly[i] = poly[i+1];
}
}
// 读取结果文件的编号
int initSerialNumber()
{
int result = 0;
char line[MAX_LENTH_OF_LINE];
FILE* file = fopen(FILENAME_OUTPUT, "r");
if (file == NULL)
return 0;
while (fgets(line, sizeof(line), file) != NULL)
{
int number;
if (sscanf(line, "%d", &number) == 1)
result = number;
}
fclose(file);
return result;
}
// 添加单项
void addItem(PolyNode* poly[],int polysNum)
{
int coef,exp;
printAllPoly(poly,polysNum);
int ch = Cchoice(polysNum);
if (ch == 0) return;
char input[100];
printf("输入的多项式格式为：系数+（空格）+指数，或者系数x^指数（支持书面写法,例如： x ->系数，指数均为1）,每次输入其中一项，输入0 0结束\n");
fflush(stdin);
while (1)
{
fgets(input, sizeof(input), stdin); // 获取用户输入
// 去除输入字符串末尾的换行符
input[strcspn(input, "\n")] = 0;
// 如果输入是 "0 0"，结束输入
if (strcmp(input, "0 0") == 0)
{
printf("修改后的多项式为：");
printPoly(poly[ch-1],1);
system("pause");
break;
}
// 尝试解析 "系数x^指数" 格式
if (strchr(input, 'x') != NULL)
{
int coef, exp;
if (sscanf(input, "%dx^%d", &coef, &exp) == 2)
{
insertTerm(poly[ch-1], coef, exp);
}
else if (sscanf(input, "%dx", coef) == 1)
{
insertTerm(poly[ch-1], coef, 1);
}
else if (sscanf(input, "%d", coef) == 1)
{
insertTerm(poly[ch-1], coef, 0);
}
else if (sscanf(input, "x^%d", exp) == 1)
{
insertTerm(poly[ch-1], 1, exp);
}
else if (sscanf(input, "-x^%d", exp) == 1)
{
insertTerm(poly[ch-1], -1, exp);
}
else if (input[0] == 'x')
{
insertTerm(poly[ch-1], 1, 1);
}
else
{
printf("输入格式错误！请重新输入。\n");
}
}
// 尝试解析 "系数 指数" 格式
else if (sscanf(input, "%d %d", &coef, &exp) == 2)
{
if (coef == 0 && exp == 0)
{
break;
}
insertTerm(poly[ch-1], coef, exp);
}
else
{
printf("输入格式错误！请重新输入。\n");
}
}
}
int main()
{
here:
int i; // i代表已存在的多项式的个数
PolyNode* poly[MAX_POLYS];
char inputFile[20] = FILENAME;
char outputFile[20] = FILENAME_OUTPUT;
// 如果文件不存在则建立文件
FILE *file;
if (!(file = fopen(inputFile, "r")))
file = fopen(inputFile, "w");
if (!(file = fopen(outputFile, "r")))
file = fopen(outputFile, "w");
fclose(file);
SerialNumber = initSerialNumber() + 1;
// 在文本中读取多项式
for (i = 1; i <= MAX_POLYS; i++)
{
poly[i-1] = createPoly();
readPolyFromFile(inputFile,poly[i-1],i);
if (poly[i-1]->next == NULL)
{
free(poly[i-1]);
i--;
break;
}
}
while (1)
{
system("cls");
printf("--------------------------------------------\n");
printf(" 一元多项式计算器 \n");
printf("--------------------------------------------\n");
printf("已存在%d个多项式\n",i);
printf("1.查看已存在的多项式\n");
printf("2.输入一个新的多项式\n");
printf("3.删除一个多项式\n");
printf("4.多项式的加法\n");
printf("5.多项式的减法\n");
printf("6.多项式的乘法\n");
printf("7.多项式求导\n");
printf("8.求多项式在x处的值\n");
printf("9.在已有的多项式中添加单项\n");
printf("0.退出系统\n");
printf("*:重启系统\n");
printf("--------------------------------------------\n");
printf("请输入你的选择:\n");
char choice;
fflush(stdin); //清除输入缓存区
scanf("%c",&choice);
switch (choice)
{
case '1':
system("cls");
printAllPoly(poly,i);
system("pause");
break;
case '2':
system("cls");
poly[i]=createPoly();
inputPoly(poly[i]);
i++;
break;
case '3':
system("cls");
deletePoly(poly,i);
i--;
break;
case '4':
system("cls");
poly[i] = createPoly();
if (poly[i] = addPoly(poly,i)) i++;
break;
case '5':
system("cls");
poly[i]=createPoly();
if (poly[i] = subtractPoly(poly,i)) i++;
break;
case '6':
system("cls");
poly[i]=createPoly();
if (poly[i] = multiplyPoly(poly,i)) i++;
break;
case '7':
system("cls");
poly[i]=createPoly();
if (poly[i] = polyDerivative(poly,i)) i++;
break;
case '8':
system("cls");
evaluatePoly(poly,i);
break;
case '9':
system("cls");
addItem(poly,i);
break;
case '0':
exit(0);
case '*':
system("cls");
goto here;
default:
printf("输入的选项不存在，请重新输入！\n");
system("pause");
}
}
return 0;
}
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