Hello, Assume if I have an array of size 78719476736 bytes. mind you that this array is dynamically allocated using malloc in my C code. Assume malloc returns a valid pointer after allocating this much memory. The size of this array is more than UINT_MAX(4294967295) , i.e. max limit of a unsigned int(32 bits) Assume my code looks like ...
For me , the Pointer was one of the hardest concept in programming languages in C++. When I was learning C++, I spent tremendous amount of time learning it. However, Now I primarily work in projects that are entirely written in languages like C#, and VB.NET etc. As a matter fact, I have NOT touched C++ for almost 4 years. Even though, C...
I have an implementation of a class X, that has two pointers to two pieces of information. I have written a new implementation, class Y, that has only one pointer to a struct that contains the two pieces of information together as adjacent members. X's and Y's methods usually only need to manipulate one of the pieces of information, but ...
I am learning about pointers and one concept is troubling me. I understand that if you have a pointer (e.g.'pointer1') of type INT that points to an array then you can fill that array with INTS. If you want to address a member of the array you can use the pointer and you can do pointer1 ++; to step through the array. The program knows th...
I'm needing a fast method to read and store objects with pointers and pointers to pointers in xml files in c++ . Every object has it's own id , name , and class type. ...
For example, if I have the following: void foo(string* s) { bar(s); // this line fails to compile, invalid init. error } void bar(const string& cs) { // stuff happens here } What conversions do I need to make to have the call the bar succeed? ...
I'm trying my hand at the iPhone course from Stanford on iTunes U and I'm a bit confused about pointers. In the first assignment, I tried doing something like this NSString *processName = [[NSProcessInfo processInfo] processName]; NSInteger *processID = [[NSProcessInfo processInfo] processIdentifier]; Which generated an error, after t...
char **Data[70]={NULL}; What is the correct terminology for this? How else could it be written? What does it look like in memory? I am reading many tutorials on pointers but I don't see it in this syntax. Any help is appreciated. Thanks. ...
Hi, I have a doubt in my program #include<stdio.h> int myFunc(char **); main() { char *a[2]={"Do","While"}; myFunc(a); } int myFunc(char **P) { /* Here I want to print the strings passed but I'm unable to print the strings I just tried the below statement which printed just the first letter which is 'D'*/ ...
This is a C++ class that I have made with n number of pointers. class SomeClass { private: int* ptr1; int* ptr2; ... int* ptrn; private: // constructors, destructors, and methods }; During the initialization stage, I want to make all those pointers point to NULL (or make pointers point to NULL by default when...
I'd like to generate a number of objects (in C++) based on the amount/number the user enters. Now I've somewhere heard that it has to be done using pointer tricks, creating a pointer to an array of the Object type required, and then dynamically increasing the size of array ( at runtime ). Isn't there a workaround of directly using name...
I need a multidimensional array of chars that is dynamic in only one dimension... I have to store a pair of strings with a length of 10 (or less) chars each, but with a variable number of "pairs". My idea was this char (*instrucao)[2][10]; Which gives me a pointer to a 2x10 array of chars, but this is not working properly when i do s...
I understand the use of void pointer for malloc implementation. void* malloc ( size_t size ); Can anyone suggest other reasons or provide some scenarios where it is useful in practice. Thanks ...
the follwing code is run successfully ... typedef struct _s { int *r; }s; void main() { s *u; int y=1000; u=malloc(sizeof(s)*8); u->r=malloc(sizeof(int)*8); u->r[5]=y; printf("%d\n",u->r[5]); getch(); } but i write the follwing code as above but gives error ....i use structure.....may why i know the reaso...
Hi, everyone! Is there any way to detect, whether the pointer points to array in C++? My problem is that I want to implement a class, that becomes the owner of the array. My class is initialized with the pointer and I would like to know, whether the pointer is really an array pointer. Here is the simplified code: class ArrayOwner { pub...
Hi, I'm having trouble understanding the following bit of code that I was hoping would create an array on the heap and fill it with the characters 9 down to 0 (I know I could just index the array like a normal stack array with [] notation to do this but I'm doing it this way to try to understand pointers in more depth): int *ptrHeapArra...
char *ps; ps = &anotherChar; cout << ps; Why this displays the value of anotherChar not just the address?. ...
I'm having a tricky debugging issue, perhaps due to my lack of understanding about how c++ manages memory. The code is too long to post, but the essential setup is as follows: global_var = 0; int main() { for(i = 0; i < N; ++i) { ClassA a; new ClassB(a); // seems to be problem! } } For some N, global_var gets corrupted (i...
Suppose I have: unsafe { byte* start = GetStartLocation(); int something = start[4]; } What is 'something'? The value of the memory address 4 bytes down from start? ...
I'm trying to complete an analexical validation but I'm facing some trouble with pointers, this is my code case 6: c = next_carac(file); for(handle=0;(words[handle] != "NULL");handle++) { strcpy(message, words[handle]); if(!strcmp(token,message)) strcpy(message, "words"); } if(isdigit(c) && strcmp(message,"word...