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1/**//******************************************************************** 2created: 2005/12/21 3created: 21:12:2005 10:49 4filename: poly.h 5author: Liu Qi 6 7 purpose: 多项式相关操作的接口与实现 8*********************************************************************/ 9#ifndef POLY_H 10#define POLY_H 11 12 13#include <stdio.h> 14#include <assert.h> 15#include "../sllist.h" 16 17 18typedef List PolynomialList; 19 20/**//*=========================================================================== 21* Function name: PolynomialAdd 22* Parameter: lhs:多项式 23* Precondition: NULL != lhs && NULL != rhs, NULL != lhs->Next && NULL != rhs->Next 24* Description: 返回一个新的多项式头指针 25* Return value: 26* Author: Liu Qi, [12/21/2005] 27===========================================================================*/ 28PolynomialList PolynomialAdd(PolynomialList lhs, PolynomialList rhs) 29{ 30 Position lhsPos = lhs->Next; //指向第一个多项式的第一个元素 31 Position rhsPos = rhs->Next; //指向第二个多项式的第一个元素 32 PolynomialList retPolynomialList= SLL_Create(); 33 ElemType Elem; 34 35 assert( NULL != lhs && NULL != rhs ); 36 assert( NULL != lhs->Next && NULL != rhs->Next ); 37 38 while (NULL != lhsPos && NULL != rhsPos) 39 { 40 //第一个多项式的指数大,复制第一个多项式的一个节点插入到retPolynomialList头部 41 if ((lhsPos->Element.HighPower) > (rhsPos->Element.HighPower)) 42 { 43 Elem.coef = lhsPos->Element.coef; 44 Elem.HighPower = lhsPos->Element.HighPower; 45 SLL_PushFront(Elem, retPolynomialList); 46 lhsPos = SLL_NextPos(lhsPos); 47 } 48 else if ((lhsPos->Element.HighPower) < (rhsPos->Element.HighPower)) 49 { 50 Elem.coef = rhsPos->Element.coef; 51 Elem.HighPower = rhsPos->Element.HighPower; 52 SLL_PushFront(Elem, retPolynomialList); 53 rhsPos = SLL_NextPos(rhsPos); 54 } 55 else //指数相等 56 { 57 Elem.coef = lhsPos->Element.coef + rhsPos->Element.coef; 58 Elem.HighPower = lhsPos->Element.HighPower; 59 SLL_PushFront(Elem, retPolynomialList); 60 lhsPos = SLL_NextPos(lhsPos); 61 rhsPos = SLL_NextPos(rhsPos); 62 } 63 } 64 65 while (NULL != lhsPos) 66 { 67 Elem.coef = lhsPos->Element.coef; 68 Elem.HighPower = lhsPos->Element.HighPower; 69 SLL_PushFront(Elem, retPolynomialList); 70 lhsPos = SLL_NextPos(lhsPos); 71 } 72 73 while (NULL != rhsPos) 74 { 75 Elem.coef = rhsPos->Element.coef; 76 Elem.HighPower = rhsPos->Element.HighPower; 77 SLL_PushFront(Elem, retPolynomialList); 78 rhsPos = SLL_NextPos(rhsPos); 79 } 80 81 return retPolynomialList; 82} 83 84#endif 85 测试代码:
#include <stdio.h> #include "poly.h"
void PrintPolynomial(PolynomialList L) { Position pos = L->Next; assert (NULL != L); for ( ; NULL != pos; pos = pos->Next) { printf("%dX^%d + ", pos->Element.coef, pos->Element.HighPower); }
printf("\n"); }
int main() { Polynomial p;
PolynomialList p1 = SLL_Create(); PolynomialList p2 = SLL_Create(); PolynomialList result = NULL;
// P1(X) = X^2 + 2X + 3 p.coef = 3; p.HighPower = 0; SLL_PushFront(p, p1); p.coef = 2; p.HighPower = 1; SLL_PushFront(p, p1); p.coef = 1; p.HighPower = 2; SLL_PushFront(p, p1); PrintPolynomial(p1);
// P2(X) = 3X^3 + 10X + 6 p.coef = 6; p.HighPower = 0; SLL_PushFront(p, p2); p.coef = 10; p.HighPower = 1; SLL_PushFront(p, p2); p.coef = 3; p.HighPower = 3; SLL_PushFront(p, p2); PrintPolynomial(p2);
result = PolynomialAdd(p1, p2);
PrintPolynomial(result);
SLL_DeleteList(p1); SLL_DeleteList(p2); SLL_DeleteList(result); return 0; }
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