輸入的表達式必須以“$”結尾:
主要是靈活運用棧這個數據結構,代碼如下:
#include <iostream>
using namespace std;
#define MAX_SIZE 100
int kindOf(char c){
switch(c){
case '(':return 1;
case '[':return 2;
case '{':return 3;
default:return 0;
}
}
bool Match(char* array, int length){
int* stack = new int[MAX_SIZE];
int top = 0;
int k = 0;
for(int i = 0; i < length; i++){
k = kindOf(array[i]);
if(k){
stack[top++] = k;
}else if(array[i] == ')'){
top--;
if(top >= 0 && stack[top] != 1){
cout<<"Failed!"<<endl;
return false;
}
}else if(array[i] == ']'){
top--;
if(top >= 0 && stack[top] != 2){
cout<<"Failed!"<<endl;
return false;
}
}else if(array[i] == '}'){
top--;
if(top >= 0 && stack[top] != 3){
cout<<"Failed!"<<endl;
return false;
}
}
}
if(top == 0){
cout<<"Successed!"<<endl;
return true;
}else{
cout<<"Failed!"<<endl;
return false;
}
}
void main(){
char array[MAX_SIZE];
int length = 0;
cout<<"chs:";
for(int i = 0; i < MAX_SIZE; i++){
char c;
cin>>c;
if(c == '$')//'$'爲終結符
break;
array[i] = c;
length++;
}
Match(array,length);
}