返回int指针？

本文介绍了返回int指针？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 我有以下代码片段 - int * createIncidenceMatrix（int numEdges，int numVertices）{ int * p =（int *）calloc（ （numEdges * numVertices），sizeof（int））; if（p == NULL）{ printf（无法分配内存）; 退出（0）; } 返回p; } void createIncidencePerView（ int numEdges，int numVertices，int viewId）{ int * pnew = createIncidenceMatrix（numEdges，numVertices）; } 这段代码编译得很好。我想知道这是否会像 那样运行。显然，我也试过运行代码。我的问题是 - 当createIncidenceMatrix（）返回p这是本地变量时，是否会在返回呼叫时取消分配？ 因此，当我在 createIncidencePerView（）内部进行createIncidenceMatrix（）调用时，调用createIncidenceMatrix（）会尝试 为pnew指针分配解除分配的本地指针？ 谢谢 Mahendra 解决方案 p是一个指针（指向您已分配的内存）。它占用的几个字节 /将在返回时释放，但不会在这些字节的副本（指针变量p的 值）之前取消分配从功能返回。 - Bartc p是一个指针（指向您已分配的内存）。它需要的几个字节 up / will /将在返回时释放，但不会在这些字节的副本之前 （指针变量p的值）已经被取消分配从 函数返回。 它会复制字节 - 保存指针变量还是复制字节 持有指针变量的值？ 如果按照你所描述的那样执行后者，这个内存在哪里？分配 - 堆？这是否意味着返回 call创建堆内存副本？ 谢谢 Mahendra p是一个指针（指向您已分配的内存）。它需要的几个字节在返回时将被释放/将被释放，而不是在那些字节的副本之前（指针变量p的值）已经从返回函数。 它会复制字节 - 保存指针变量还是复制字节 持有指针变量的值？ 如果你按照你所描述的那样做了后者，这个内存在哪里？分配 - 堆？这是否意味着返回 call创建堆内存副本？ 谢谢 Mahendra I have following code snippet -int *createIncidenceMatrix(int numEdges, int numVertices) {int *p = (int *) calloc((numEdges*numVertices), sizeof(int));if(p == NULL) {printf("Could not allocate memory");exit(0);}return p;}void createIncidencePerView(int numEdges, int numVertices, int viewId) {int *pnew = createIncidenceMatrix(numEdges, numVertices);}This code compiles fine. I am trying to understand if this will run asintended. Obviously, I tried running the code also. My question is -When createIncidenceMatrix() return p which is local variable, will pget deallocated at return call ?So when i make createIncidenceMatrix() call insidecreateIncidencePerView(), will the call createIncidenceMatrix() tries toassign deallocated local pointer to the pnew pointer ?ThanksMahendra 解决方案p is a pointer (to the memory you''ve allocated). The few bytes it takes up/will/ be deallocated on return, but not before a copy of those bytes (thevalue of the pointer variable p) has been made to return from the function.--Bartcp is a pointer (to the memory you''ve allocated). The few bytes it takesup /will/ be deallocated on return, but not before a copy of those bytes(the value of the pointer variable p) has been made to return from thefunction.Will it copy the bytes - holding pointer variable or copy the bytesholding the value of pointer variable ?If it does the latter as described by you, where is this memoryallocated - heap ? Does this mean "return" call creates heap memory copy ?ThanksMahendrap is a pointer (to the memory you''ve allocated). The few bytes it takesup /will/ be deallocated on return, but not before a copy of those bytes(the value of the pointer variable p) has been made to return from thefunction.Will it copy the bytes - holding pointer variable or copy the bytesholding the value of pointer variable ?If it does the latter as described by you, where is this memoryallocated - heap ? Does this mean "return" call creates heap memory copy ?ThanksMahendra 这篇关于返回int指针？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！