(2) 设计两个栈 S1、S2 都采用顺序栈方式,并且共享一个存储区[0,MaxLen-1],为了尽量利用空间,减少溢出的可能,可采用栈顶相向、迎面增长的存储方式,设计一个有关栈的入栈和出栈算法。
代码:
#include <iostream>
using namespace std;
const int StackSize =15;
template <class T>
class BothStack {
public:
BothStack() {
lsTop=-1;
rsTop=StackSize;
}
~BothStack() { }
void Push(int i,T x);
T Pop(int i,T *x);
private:
T data[StackSize];
int lsTop,rsTop;
};
template<class T>
void BothStack<T>::Push(int i,T x) {
if(rsTop==lsTop+1) {
throw i;
}
if(i==1) {
lsTop++;
data[lsTop]=x;
}
else if(i==2) {
rsTop--;
data[rsTop]=x;
}
else cout<<"该桟不存在!"<<endl;
return;
}
template<class T>
T BothStack<T>::Pop(int i,T *x) {
if(i==1) {
if(lsTop==-1) {
return 0;
}
*x=data[lsTop];
lsTop--;
}
else if(i==2) {
if(rsTop==StackSize) {
return 0;
}
*x=data[rsTop];
rsTop++;
}
else {
cout<<"该桟不存在!"<<endl;
return 0;
}
return 1;
}
int main() {
int x,j,i=0;
int A[10]={1,3,5,7,9,11,13,15,17,19};
int B[10]={2,4,6,8,10,12,14,16,18,20};
BothStack<int> S;
try {
for(i=0;i<sizeof(A)/sizeof(int);i++)
S.Push(1,A[i]);
for(i=0;i<sizeof(B)/sizeof(int);i++)
S.Push(2,B[i]);
}catch(int j){
cout<<"栈已满!"<<endl;
cout<<"桟1:";
while(true) {
if(S.Pop(1,&x))
cout<<x<<" ";
else {
cout<<"桟1已空!"<<endl;
break;
}
}
cout<<"桟2:";
while(true) {
if(S.Pop(2,&x))
cout<<x<<" ";
else {
cout<<"桟2已空!"<<endl;
break;
}
}
}
while(S.Pop(1,&x)) {
cout<<"桟1:";
cout<<x<<" ";
while(S.Pop(1,&x)) {
cout<<x<<" ";
}
}
cout<<endl;
while(S.Pop(2,&x)) {
cout<<"桟2:";
cout<<x<<" ";
while(S.Pop(2,&x)) {
cout<<x<<" ";
}
}
return 0;
}