system("pause");太奇怪了，加上他就出错，去掉就好了；小弟真心迷茫了，求大神指导。
小弟用char数组试着写个二叉搜索树，想法挺简单，就是插入char数字，空白处用‘-’填充；只是被system("pause")搞蒙了。main.cpp第28行加上system("pause")就出错，注释掉就不出错。求大神前辈给点指导呀！！！（小弟使用codeblock下的gcc编译）
fun.h

#ifndef _FUN_H_
#define _FUN_H_

char* Enlarge(char oldArry[], int &size);
void Traverse(char oldArray[], const int size);

#endif

fun.cpp

#include <cstring>
#include "fun.h"
using namespace std;
/*
    Double the size of old array and fill the empty space with '-',
    then delete the old array and return the pointer to the new array.
*/
char* Enlarge(char oldArray[], int &size) {
    char* newArray = new char[ 2 * size];
    size = 2 * size;
    for (int i = 0; i < size; ++i) {
        newArray[i] = oldArray[i];
    }
    for (int i = size; i < 2 * size; ++i) {
        newArray[i] = '-';
    }
    delete []oldArray;
    return newArray;
}

/*
    Traverse the charactor array and output the element(except '-') to the screen.
*/
void Traverse(char oldArray[], const int size) {
    for (int i = 0; i < size; ++i) {
        if (oldArray[i] == '-') {
            continue;
        }
        cout << oldArray[i] << "  ";
    }
    cout << endl;
    return;
}

BST.h

#ifndef _BST_H_
#define _BST_H_

int Search (char oldArray[], const int size, const char value);

char* Insert (char oldArray[], int &size, const char value);

void Delete (char oldArray[], int &size);

#endif

BST.cpp

#include "BST.h"
#include "fun.h"
using namespace std;

int Search(char oldArray[], const int size, const char value) {
    int i = 0;
    while (i < size) {
        if (oldArray[i] == '-') {
            break;
        }
        if (value == oldArray[i]) { 
 
            return i;
        } else if (value < oldArray[i]) {
            i = i * 2 + 1;
            continue;
        } else if (value > oldArray[i]) {
            i = i * 2 + 2;
            continue;
        }
    }
    return -1;
}

/*
    Insert a new element, if there is no enough space, enlarge the size of oldarray.
*/
char* Insert(char oldArray[], int &size, const char value) {
    if (Search(oldArray, size, value) != -1) {
        return oldArray;
    }
    int i = 0;
    while (true) {
        if (oldArray[i] == '-') {
            oldArray[i] = value;
            return oldArray;
        } else if (value < oldArray[i]) {
            i = i * 2 + 1;
            if (i >= size) {
                char* newArray = Enlarge(oldArray, size);
                newArray[i] = value;
                return newArray;
            }
            continue;
        } else {
            i = i * 2 + 2;
            if (i >= size) {
                char* newArray = Enlarge(oldArray, size);
                newArray[i] = value;
                return newArray;
            }
            continue;
        }
    }
}

void Delete (char oldArray[], int &size) {
    delete []oldArray;
    size = 0;
    return;
}

main.cpp

#include <iostream>
#include <cstdlib>
#include <cstring>
#include "BST.h"
#include "fun.h"

using namespace std;

int main()
{
    char* bst = new char[1];
    bst[0] = '-';
    int size = strlen(bst);
    int index = -1;
    bst = Insert(bst, size, '4');
    bst = Insert(bst, size, '3');
    bst = Insert(bst, size, '7');
    bst = Insert(bst, size, '2');
    bst = Insert(bst, size, '5');
    bst = Insert(bst, size, '8');
    Traverse(bst, size);
    index = Search(bst, size, '4');
    if (index != -1) {
        cout << "haha, I find it : " << bst[index] << endl;
    } else {
        cout << "this one isn't in the BST! " << endl;
    }
    //system("pause");
    Delete(bst, size);
    return 0;
}

[解决办法]
感觉问题出在这里：

    char* bst = new char[1];
    bst[0] = '-';

bst的size应该至少为2才对，因为字符串需要一个结束符'\0'，否则你用strlen计算的长度是随机的，至少可以这样改：

    char* bst = new char[2];
    bst[0] = '-';
    bst[1] = '\0';

[解决办法]
代码没瞄一眼，先请问加上pause后是编译出错还是运行出错？
[解决办法]
linux支持system("pause")的命令？