調試斷言失敗（動態類型變量）

Question

我的代碼編譯爲這樣，但我不明白爲什麼我一直得到這個錯誤告訴我，「調試斷言失敗」。爲什麼是這樣？

#include <iostream> 
using namespace std; 
struct Bag 
{ 
int k; 
}; 


int main() 
{ 
    int *p1; 
    int *p2; 
    char p3; 

    //k = 100; // Assigns variable of type bag to 100 

    p1 = new int; // Variables created using the new operator are called dynamic variables 
    p2 = new int; 


    *p1 = 30; 
    *p2 = 50; 
    p3 = 'K'; 

    *p1 = *p1 + *p2; 
    p1 = p2; 

    cout << "The sum of the two pointers is = " << *p1 << endl; 

    delete p1; 
    delete p2;    // Delete the dynamic variable p1 and return the memory occupied by p1 to the freestore to be reused. 

    system ("Pause"); 
    return 0; 
} 

Answer 1

我猜你得到調試斷言失敗在該行：

delete p2; 

這裏的問題是，你設置「P1 = P2」，因此兩個指針指向的內存位置包含整數「50」。之後，您刪除指針p1，這意味着UN分配包含整數「50」的內存位置。

在這一點上，p2是未定義的，試圖刪除它將導致調試斷言失敗的錯誤。