How to solve C runtime error: 'invalid pointer'?
Introduction:
C is a powerful programming language, but you may encounter various runtime errors when writing code. One of the common errors is the "invalid pointer" error. This error message indicates that there is a pointer to an invalid memory address in the code. This article explains how to resolve this error and provides relevant code examples.
What is an invalid pointer?
In C, a pointer is a variable that holds the memory address of a variable. Pointers can point to variables of any type, including integer, floating point, character, etc. The 'invalid pointer' error occurs when a pointer points to an invalid memory address. This situation usually occurs in the following three situations:
int* p; *p = 10;
int* p = new int; delete p; *p = 10;
int arr[5] = {1, 2, 3, 4, 5}; int* p = &arr[0]; p = p + 10; *p = 10;
How to solve 'invalid pointer' error?
In order to solve the 'invalid pointer' error, we need to follow the following steps:
int* p1 = new int; *p1 = 10; int* p2 = nullptr; p2 = new int; *p2 = 20;
int* p = new int; *p = 10; delete p; p = nullptr; // 之后不要再使用指针p
int arr[5] = {1, 2, 3, 4, 5}; int* p = &arr[0]; if (p < &arr[5]) { p = p + 10; // 避免指针超出范围 *p = 10; }
Conclusion:
'invalid pointer' is one of the common runtime errors in C, which means that there is a pointer to an invalid memory address in the code. To resolve this error, we should properly initialize the pointer and ensure that it points to a valid memory address, avoid repeatedly releasing the memory pointed to by the pointer, and avoid letting the pointer exceed the scope of the memory it points to.
By following the above steps, we can better manage pointers and reduce the occurrence of 'invalid pointer' errors. When writing and debugging code, paying close attention to the use of pointers can help us detect and solve such errors early and improve the quality and robustness of the code.
The above is the detailed content of How to solve C++ runtime error: 'invalid pointer'?. For more information, please follow other related articles on the PHP Chinese website!