Re: [問題] 有關 new 和 delete

[jackwei (吐司)]

→ proLIONS:you should use **a instead of *a
→ proLIONS:you may think of **a as something like *a[]

感謝p兄指教
改成這個樣子的確就可以了:

void change(int **a, int &length)
{
     delete [] *a;

     length += 2;
     *a = new int [length];
     for(int i=0;i<length;i++) (*a)[i] = i+1;
}

int main()
{
    int length = 3;
    int *a = new int [length];
    int **aa = &a;
    for(int i=0;i<length;i++)a[i]=i+1;
    for(int i=0;i<length;i++)cout<<a[i]<<" ";

    for(int i=0;i<5;i++){
        change(aa, length);
        for(int j=0;j<length;j++)cout<<a[j]<<" ";
        cout<<endl;
    }

    delete [] a;

    return 0;
}


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◆ From: 118.160.43.22
※ 編輯: jackwei         來自: 118.160.43.22        (09/18 14:55)
推 QQ29:用*&阿
推 nowar100:我來自推一下  置底十三誡No.13  XD
→ jackwei:原來有*&這種用法  又受教啦
→ x000032001:看到這篇我才搞懂*& = =a
→ LPH66:*& 是 C++ 才有的喔～  寫 C 的還是得用這篇的方法 XD
推 purpose:不知不覺，從十誡變成十三誡了