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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include<iostream>
  4. //using namespace std;
  5.  
  6. struct list{
  7. 	int coef;
  8. 	int expon;
  9. 	struct list *next;
  10. };
  11. typedef struct list node;
  12. typedef node *link;
  13.  
  14. void createpoly(link *ptr);
  15. link mul(link poly1,link poly2); 
  16. link add(link poly1,link poly2);
  17. int compare(int,int);  // 比較兩多項式的指數大小
  18. void attach(int,int,link *ptr);  // 將一個節點附加在串列的結尾
  19. void printfresult( link );
  20. link freelist( link temp ); 
  21.  
  22. int main()
  23. {
  24.     link *ptr=NULL;
  25. 	link poly1 = NULL;  // intially there are no nodes
  26. 	link poly2 = NULL;
  27. 	link answer = NULL;  // 放置多項式的運算結果
  28. 	link temp;
  29.  
  30. //input polynomial 1 
  31. printf("Enter the polynomial 1: ");
  32. createpoly(&poly1);
  33.  
  34. //input polynomial 2 
  35. printf("Enter the polynomial 2: ");
  36. createpoly(&poly2);
  37.  
  38.  
  39. 	printf("Answer \n");
  40.     answer = mul(poly1,poly2);
  41. 	printfresult(answer);
  42.  
  43. 	system("pause");
  44.  
  45. }
  46. void createpoly(link *ptr)
  47.      {
  48. 	link head=NULL;  // pointer to head
  49. 	link current;    // pointer to current
  50.  
  51. 	int coef,expon ;
  52. 	int sign = 1 ;
  53. 	char token ;
  54.  
  55. 	do {
  56. 		scanf("%d", &coef );   // 接收係數
  57. 		getchar();              // 接收 ^
  58. 		scanf("%d", &expon );  // 接收指數
  59. 		scanf("%c", &token );  // 接收下一項的正負號
  60.  
  61. 		if( !head ){  // 如head為NULL時
  62. 			head =(node*)malloc( sizeof ( node ));  //creat node
  63. 			head->coef = coef * sign; // place 係數值 in node
  64. 			head->expon = expon;      // place 指數值 in node
  65. 			head->next = NULL;        // node does not link to another node
  66.  
  67. 		                 }
  68. 		else{
  69. 			current = head; // 指到串列之首
  70. 			while( current->next !=NULL ){ // 此while是在找串列的最後一個節點 就是current->next 為 NULL時
  71. 				current = current->next;
  72. 			}
  73. 			current->next = (node *)malloc( sizeof( node)); // 在串列最後再creat一個node
  74. 			current->next->coef = coef * sign ;  // place 係數值 in node
  75. 			current->next->expon = expon;        // place 指數值 in node
  76. 			current->next->next = NULL;	         // node does not link to another node
  77. 		}
  78.  
  79.         // 判定下一項的正負號
  80. 		if( token == '+')  // 如為正
  81. 			sign = 1;
  82. 		else if( token == '-')  // 如為負
  83. 			sign = -1;
  84.  
  85. 	}while( token != '\n');  // 當token為enter時就結束while
  86.  
  87. 	*ptr = head;  // head assign 給*sptr 指到串列之首
  88.  
  89.  
  90. }
  91.  
  92.  
  93. // 多項式的加法
  94. link add(link poly1,link poly2)
  95. {
  96. 	link front , rear, temp;
  97. 	int sum;
  98. 	rear = ( node *)malloc( sizeof( node ));  //creat node
  99. 	front = rear;
  100.  
  101.  
  102. 	while( poly1, poly2 )
  103. 		switch( compare( poly1->expon, poly2->expon )){
  104.  
  105. 		case -1:  // poly1->expon 小於 poly2->expon
  106. 			attach( poly2->coef, poly2->expon, &rear);
  107. 			poly2 = poly2->next;
  108. 			break;
  109.  
  110. 		case 0:  // poly1->expon 等於 poly2->expon
  111. 			sum = poly1->coef + poly2->coef ;
  112. 			if( sum )
  113. 				attach( sum, poly1->expon, &rear);
  114. 			poly1 = poly1->next;
  115. 			poly2 = poly2->next;
  116. 			break;
  117.  
  118. 		case 1:  // poly1->expon 大於 poly2->expon
  119. 			attach( poly1->coef, poly1->expon, &rear);
  120. 			poly1 = poly1->next;
  121. 			break;
  122. 	}
  123.  
  124. 	/*copy rest of list head1 and then head2*/
  125. 	for( ; poly1 ; poly1 = poly1->next)
  126. 		attach( poly1->coef, poly1->expon, &rear);
  127. 	for( ; poly2 ; poly2 = poly2->next)
  128. 		attach( poly2->coef, poly2->expon, &rear);
  129. 	rear->next = NULL;
  130.  
  131. 	/* delete extra initial node */
  132. 	temp = front;
  133. 	front = front->next;
  134. 	free( temp );
  135. 	return front;
  136. }
  137.  
  138. link mul(link poly1,link poly2)
  139. {
  140. 	link temp = NULL , sum = NULL;
  141. 	link first;
  142. 	int coef , expon;
  143.  
  144. 	first = poly1;
  145.    	while(poly2 != NULL){
  146. 		while( poly1 != NULL){
  147. 			coef = (poly1->coef) * (poly2->coef);
  148. 			expon = (poly1->expon) * (poly2->expon);
  149. 			attach( coef, expon, &temp );  // 將一個節點附加在串列的結尾
  150. 			poly1 = poly1->next;  // poly1 下一個節點
  151. 		}
  152. 		sum = add(temp,sum);
  153. 		poly2 = poly2->next;
  154. 		poly1 = first;  // poly1 回到最首項
  155. 		temp = freelist(temp);  // 釋回節點串列空間
  156. 	}
  157. 	return sum;
  158.  
  159. }
  160. int compare(int a,int b)
  161. {
  162. 	if(a < b)       return -1;
  163.     else if(a > b)  return 1;
  164. 	else             return 0;
  165. }
  166.  
  167. // 將一個節點附加在串列的結尾
  168. void attach( int coefficient , int exponent, link *ptr)
  169. {
  170. 	link temp;
  171. 	temp = (node*)malloc(sizeof(node));  //creat node
  172. 	temp->coef = coefficient ;
  173. 	temp->expon = exponent ;
  174. 	(*ptr)->next=temp;
  175. 	*ptr = temp;
  176. }
  177.  
  178. // 把運算之後的多項式printf出來
  179. void printfresult( link node )
  180. {
  181. 	while( node != NULL ){
  182. 		if(node->coef > 0 ){  // 係數為正時
  183. 			printf( "+%dx^%d", node->coef, node->expon);
  184. 		}
  185. 		else{    // 係數為負時
  186. 			printf("%dx^%d", node->coef, node->expon);
  187. 		}
  188. 		node = node->next; // 到下一個node
  189. 	}
  190. 	printf( "\n" );
  191.  
  192. }
  193.  
  194. // 釋回節點串列空間
  195. link freelist( link head )
  196. {
  197. 	link temp;
  198.  
  199. 	while(temp != NULL){
  200. 		temp = head->next;
  201. 		free(head);
  202. 		head = temp;
  203. 	}
  204.  
  205. 	head = NULL;
  206. 	return head;
  207. }
  208.  
  209.  
  210.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.c:3:19: error: iostream: No such file or directory
prog.c: In function ‘main’:
prog.c:28: warning: unused variable ‘temp’
prog.c:24: warning: unused variable ‘ptr’
prog.c:43: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result
prog.c: In function ‘createpoly’:
prog.c:56: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:58: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:59: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c: In function ‘add’:
prog.c:102: warning: left-hand operand of comma expression has no effect
prog.c: In function ‘main’:
prog.c:45: warning: control reaches end of non-void function
stdout 
Standard output is empty
https://ideone.com/V3pNp
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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