C語言中棧和隊列實現表達式求值的實例
更新時間：2017年08月14日 10:09:56 投稿：lqh
這篇文章主要介紹了C語言中棧和隊列實現表達式求值的實例的相關資料,這里主要是對數據結構中棧和隊列的理解和應用，需要的朋友可以參考下
C語言中棧和隊列實現表達式求值的實例
實現代碼：
#include<stdio.h>
#include<stdlib.h>
#define OK 1
#define ERROR 0
#define STACK_SIZE 20
#define STACK_INCREMENT 10
#define QUEUE_SIZE 20
typedef int Status;
typedef char StackElemtype;
typedef struct Stack{
StackElemtype* base;
StackElemtype* top;
int stackSize;
}Stack;
Status StackInit(Stack* s){
s->base = (StackElemtype*)malloc(sizeof(StackElemtype) * STACK_SIZE);
if( !s->base )
return ERROR;
s->top = s->base;
s->stackSize = STACK_SIZE;
return OK;
}
Status Pop(Stack* s,StackElemtype* value){
if( s->base == s->top ){
printf("\nstack empty\n");
return ERROR;
}
*value = *(--(s->top));
return OK;
}
Status Push(Stack* s,StackElemtype value){
if( s->top - s->base == s->stackSize){
s->base = (StackElemtype*)realloc(s->base,sizeof(StackElemtype) * (STACK_INCREMENT + STACK_SIZE));
if( !s->base )
return ERROR;
s->top = s->base + STACK_SIZE;
s->stackSize = STACK_SIZE + STACK_INCREMENT;
}
*(s->top) = value;
s->top++;
return OK;
}
int StackLength(Stack s){
return s.top - s.base;
}
typedef double StackElemtype_ForValueExperssion;
typedef struct Stack_2{
StackElemtype_ForValueExperssion* base;
StackElemtype_ForValueExperssion* top;
int stackSize;
}Stack_2;
Status StackInit_2(Stack_2* s){
s->base = (StackElemtype_ForValueExperssion*)malloc(sizeof(StackElemtype_ForValueExperssion) * STACK_SIZE);
if( !s->base )
return ERROR;
s->top = s->base;
s->stackSize = STACK_SIZE;
return OK;
}
Status Pop_2(Stack_2* s,StackElemtype_ForValueExperssion* value){
if( s->base == s->top ){
printf("\nstack empty\n");
return ERROR;
}
*value = *(--(s->top));
return OK;
}
Status Push_2(Stack_2* s,StackElemtype_ForValueExperssion value){
if( s->top - s->base == s->stackSize){
s->base = (StackElemtype_ForValueExperssion*)realloc(s->base,sizeof(StackElemtype_ForValueExperssion) * (STACK_INCREMENT + STACK_SIZE));
if( !s->base )
return ERROR;
s->top = s->base + STACK_SIZE;
s->stackSize = STACK_SIZE + STACK_INCREMENT;
}
*(s->top) = value;
s->top++;
return OK;
}
typedef double QueueElemtype;
typedef char QueueOperatorValue;
typedef struct QueueNode{
QueueElemtype data;
QueueOperatorValue operator;
struct QueueNode* next;
int flag;
}QueueNode,*QueueNodePtr;
typedef struct Queue{
QueueNodePtr front;
QueueNodePtr rear;
}Queue;
Status QueueInit(Queue* q){
q->front = (QueueNodePtr)malloc(sizeof(QueueNode));
if( !q->front )
return ERROR;
q->rear = q->front;
q->rear->next = NULL;
return OK;
}
Status QueueInsert(Queue* q,QueueElemtype value){
QueueNodePtr new;
new = (QueueNodePtr)malloc(sizeof(QueueNode));
if( !new )
return ERROR;
new->data = value;
new->flag = 1;
new->next = NULL;
q->rear->next = new;
q->rear = new;
return OK;
}
Status QueueInsert_operatorValue(Queue* q,QueueOperatorValue value){
QueueNodePtr new;
new = (QueueNodePtr)malloc(sizeof(QueueNode));
if( !new )
return ERROR;
new->operator = value;
new->flag = 0;
new->next = NULL;
q->rear->next = new;
q->rear = new;
return OK;
}
Status QueueDelete(Queue* q,QueueElemtype* value,QueueOperatorValue *operator,int* symbol){
QueueNodePtr first;
if( q->front == q->rear )
return ERROR;
first = q->front->next;
if( first->flag == 1 ){
*value = first->data;
*symbol = 1;
}
else{
*operator = first->operator;
*symbol = 0;
}
q->front->next = first->next;
if( first == q->rear ){
q->rear = q->front;
}
return OK;
}
/* 利用棧將中綴表達式轉化為后綴表達式：
* ——————————————————————————————————————————————————————————————
* | 用戶的輸入 | 進行的處理 |
* | 0~9： | 直接輸出到控制臺 |
* | /，*，( | 直接Push |
* | +，- | 將棧中的元素Pop直到1.?？栈蛘呤?.遇到( |
* | ) | 在遇到(之前將棧中的元素全部Pop |
* ——————————————————————————————————————————————————————————————
* */
Status Infix2Postfix(Queue* q){
//Queue q;
//QueueInit(&q);
Stack s;
StackInit(&s);
char c,e;
char bufferDigit[10];
int i = 0;
double longDigit;
printf(" Please Enter Infix Expression\n");
printf("------------NOTE: end of '#'--------------\n");
scanf("%c", &c);
while( '#' != c){
while( c <= '9' && c >= '0' || '.' == c ){
bufferDigit[i++] = c;
bufferDigit[i] = '\0';
scanf("%c", &c);
if(!((c <= '9' && c >= '0' ) || '.' == c )){
longDigit = atof(bufferDigit);
QueueInsert(q,longDigit);
i = 0;
}
}
if( '(' == c || '*' == c || '/' == c ){
Push(&s, c);
}
else if( '+' == c || '-' == c ){
if( !StackLength(s) )
Push(&s, c);
else{
Pop(&s, &e);
while( '(' != e ){
QueueInsert_operatorValue(q, e);
if( StackLength(s) == 0 ){
break;
}else
Pop(&s, &e);
}
if( '(' == e )
Push(&s, e);
Push(&s, c);
}
}else if( ')' == c ){
Pop(&s, &e);
while( '(' != e ){
QueueInsert_operatorValue(q, e);
Pop(&s, &e);
}
}else if( '#' == c){
break;
}else{
printf("input ERROR!\n");
return ERROR;
}
scanf("%c", &c);
}
while(StackLength(s)){
Pop(&s, &e);
QueueInsert_operatorValue(q, e);
}
QueueInsert_operatorValue(q,'#');
return OK;
}
Status ShowQueue(Queue q){
printf("The Reverse Polish Notation is:");
if(q.front == q.rear){
printf("Queue Empty");
return ERROR;
}
QueueNodePtr p = q.front->next;
while(p != q.rear){
if(p->flag)
printf("%g ", p->data);
else
printf("%c ", p->operator);
p = p->next;
}
printf("\n");
return OK;
}
/* 利用棧求解后綴表達式(逆波蘭表達式)的值。
* ——————————————————————————————————————————————————————————————————————
* | +，-，*，/， | 將棧頂的兩個元素彈出進行計算，將結果壓入棧頂 |
* | 數字 | 將其壓入棧頂 |
* ———————————————————————————————————————————————————————————————————————
* */
Status ValueExpression(Queue q){
Stack_2 s;
StackInit_2(&s);
double o1;
double o2;
QueueElemtype number;
QueueOperatorValue operator;
int symbol;
QueueDelete(&q,&number,&operator,&symbol);
while( symbol == 1 || ( symbol == 0 && '#' != operator)){
if(symbol == 1){
Push_2(&s, number);
}
else if(symbol == 0){
switch(operator){
case '+':
Pop_2(&s,&o1);
Pop_2(&s,&o2);
Push_2(&s,o2 + o1);
break;
case '-':
Pop_2(&s,&o1);
Pop_2(&s,&o2);
Push_2(&s,o2 - o1);
break;
case '*':
Pop_2(&s,&o1);
Pop_2(&s,&o2);
Push_2(&s,o2 * o1);
break;
case '/':
Pop_2(&s,&o1);
Pop_2(&s,&o2);
Push_2(&s,o2 / o1);
break;
}
}
QueueDelete(&q,&number,&operator,&symbol);
}
Pop_2(&s,&o1);
printf("The Value of the Expression is %g\n",o1);
return OK;
}
int main(){
Queue q;
QueueInit(&q);
Infix2Postfix(&q);
ShowQueue(q);
/*
QueueElemtype number;
QueueOperatorValue operator;
int symbol;
QueueDelete(&q,&number,&operator,&symbol);
printf("%f,%c,%d\n",number,operator,symbol);
*/
ValueExpression(q);
//Stack
/*
Stack s;
StackInit(&s);
StackElemtype c;
Push(&s,'1');
Push(&s,'2');
Push(&s,'3');
Push(&s,'4');
Pop(&s,&c);
printf("%c ", c);
Pop(&s,&c);
printf("%c ", c);
Pop(&s,&c);
printf("%c ", c);
Pop(&s,&c);
printf("%c ", c);
*/
//Queue
/*
Queue q;
QueueElemtype c;
QueueInit(&q);
QueueInsert(&q,1);
QueueInsert(&q,2);
QueueInsert(&q,3);
QueueInsert(&q,4);
QueueDelete(&q,&c);
printf("%d ", c);
QueueDelete(&q,&c);
printf("%d ", c);
QueueDelete(&q,&c);
printf("%d ", c);
QueueDelete(&q,&c);
printf("%d ", c);
if(QueueDelete(&q,&c)){
printf("%d ",c);
}
*/
/*
Queue q;
QueueInit(&q);
QueueInsert(&q,2.1);
QueueInsert_operatorValue(&q,'+');
QueueInsert(&q,43.1);
QueueInsert_operatorValue(&q,'a');
QueueInsert_operatorValue(&q,'(');
int iswho;
double d;
char c;
QueueDelete(&q,&d,&c,&iswho);
if(iswho == 1)
printf("%f ",d);
else
printf("%c ", c);
QueueDelete(&q,&d,&c,&iswho);
if(iswho == 1)
printf("%f ",d);
else
printf("%c ", c);
QueueDelete(&q,&d,&c,&iswho);
if(iswho == 1)
printf("%f ",d);
else
printf("%c ", c);
QueueDelete(&q,&d,&c,&iswho);
if(iswho == 1)
printf("%f ",d);
else
printf("%c ", c);
*/
return 0;
}
以上就是C語言數據結構中棧和隊列的應用，如有疑問請留言或者到本站社區(qū)交流討論，感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
相關文章
這篇文章主要為大家詳細介紹了C語言實現兩個矩陣相乘的程序，具有一定的參考價值，感興趣的小伙伴們可以參考一下2018-05-05
大家好，本篇文章主要講的是使用用C++做一顆會跳動的愛心實例代碼，感興趣的同學趕快來看一看吧，歡迎借鑒學習C++做一顆會跳動的愛心實例代碼2021-12-12
c語言while語句的使用語法如“while(condition)?{statement(s);}”,該語句可以是單個語句,也可以是一個語句塊,其條件可以是任意表達式,true是任意非零值,當條件為真時,循環(huán)進行迭代2022-05-05
這篇文章主要為大家詳細介紹了OpenCV實現幀差法檢測運動目標，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下2020-03-03
Visual Studio 如何創(chuàng)建C/C++項目問題
這篇文章主要介紹了Visual Studio 如何創(chuàng)建C/C++項目問題，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教2023-02-02
函數的重載是指利用相同的函數名設計一系列功能相近，但是功能細節(jié)不一樣的函數接口；因此運算符重載也是指對于同一個運算符來說，它可以用于實現不同的功能。下面就一起來理解下運算符重載的應用吧2023-04-04
這篇文章主要為大家介紹了C到C++的升級關系及區(qū)別實例探究,有需要的朋友可以借鑒參考下,希望能夠有所幫助,祝大家多多進步,早日升職加薪2024-01-01
這篇文章主要為大家詳細介紹了在C/C++中如何寫調試宏的相關知識,文中的示例代碼講解詳細,具有一定的借鑒價值,有需要的小伙伴可以參考一下2024-05-05
這篇文章主要為大家詳細介紹了Qt中實現定時器的兩種不同方法，文中的示例代碼講解詳細，對我們了解Qt有一定的幫助，感興趣的可以跟隨小編一起學習一下2022-11-11
我們知道每張圖像都能夠用矩陣來表示,矩陣中每個元素的值表示了圖像中每個像素值,像素值的大小就對應著圖像的亮暗,本文主要來和大家介紹一下C++進行圖像像素計算的相關知識,感興趣的可以了解下2023-12-12