-1
votes
2answers
94 views

Assigning strings to pointer in C Language

I am a new learner of C language, my question is about pointers. As far i learned and searched pointers can only store addresses of other variables, but cannot store the actual values(like integers or ...
9
votes
4answers
1k views

Pointer indexing

I am currently reading a book titled "Numerical Recipes in C". In this book, the author details how certain algorithms inherently work better if we had indices starting with 1 (I don't entirely follow ...
2
votes
0answers
148 views

What's wrong with this pointer? [migrated]

I though I had finally understood pointers but then I encountered this issue: typedef struct { unsigned int a; unsigned int b; } Bar; Bar *foo; foo->a = 3; This last instruction ...
0
votes
3answers
127 views

usage of double pointers and n pointers?

I am familiar with basic C pointers. Just wanted to ask what is the actual use of double pointers or for that matter n pointer? #include<stdio.h> int main() { int n = 10 , *ptr , **ptr_ptr ; ...
0
votes
0answers
74 views

Different ways of addressing pointers C/C++ [migrated]

I'm a little confused about accessing specific addresses using c style pointers. I have a 32 bit chip which I'm tryin to program. I need to flip some bits or whatever in ram. The following solution ...
0
votes
5answers
106 views

What conclusion to be drawn from no difference in generated assembly from 2 rather different programs?

I might not have had a counterexample when I got the reply "A pointer is just an address, what's the difficulty?" but I didn't really buy such a simple explanation and at assembly code it's not ...
4
votes
3answers
366 views

How to teach pointers to beginners in C? [closed]

I'll hold a little presentation about C-Pointers in a small group of people with beginners programming skills, with no CS background. Just people who would like to learn something about coding and ...
0
votes
3answers
171 views

ANSI C pointers corrupted values

I am working on ANSI C and having some issues with the pointers. That is that after a point in my program the pointer's values change without me interfering, is something like overwriting them. I ...
2
votes
3answers
458 views

How do you read this line of code?

Forgive me for my poor English, me and my friend were doing school homework, suddenly he asked me to read this line of code ptr = &array[1][1][1] (ptr is a pointer to an integer). He said ...
3
votes
2answers
205 views

Is it better to use an external variable or to pass around a pointer?

While writing in C, I have always wondered about when is the best time to use an external variable. I generally prefer to pass a pointer into a method. Is there a correct time to use an external ...
4
votes
3answers
204 views

adding array pointer in c

I am having problems understanding how this equation works in c: char *sum(char *a, int b) { return &a[b]; } printf("%d", sum(5, 4)); I understand how arrays work, and I understand how to ...
6
votes
1answer
2k views

Is this a valid example of a dangling pointer?

The book "Data Structures in C" (Horowitz and Sahni) suggests that in the following code the pointer pf is behaving as a dangling reference: float f,*pf; pf=(float*) malloc(sizeof(float)); *pf=2.6; ...
4
votes
4answers
2k views

Was C designed to facilitate Object-Oriented programming?

I am trying to broaden my understanding of the history and development of object-oriented programming, and I am curious to find out if C was designed to facilitate Object-Oriented programming? (like ...
-2
votes
4answers
843 views

C simple arrays and pointers question

So here's the confusion, let's say I declare an array of characters char name[3] = "Sam"; and then I declare another array but this time using pointers char * name = "Sam"; What's the ...
2
votes
3answers
2k views

Functions returning pointers

C++ noob here. I have a very basic question about a construct I found in the C++ book I am reading. // class declaration class CStr { char sData[256]; public: char* get(void); }; // ...
6
votes
5answers
1k views

What's so bad about pointers in C++?

To continue the discussion in Why are pointers not recommended when coding with C++ Suppose you have a class that encapsulates objects which need some initialisation to be valid - like a network ...
-5
votes
2answers
495 views

what will be the Output of the following code written in “ C”?

#include<stdio.h> void main() { char ***p="hello"; printf("%c",++*p++); } I haven't understand the concept of (*) indirection uses here three times. When i compiled this program then the ...
5
votes
6answers
845 views

why are both index[array] and array[index] valid in C?

For example consider: int index = 3; int array[4] = {0, 1, 2, 3}; then both index[array] and array[index] are valid expressions, much like *(index + array) and *(array + index). In C arrays why is ...
1
vote
9answers
3k views

Pointers in C vs No pointers in PHP

Both languages have the same syntax. Why does C have the weird * character that denotes pointers (which is some kind of memory address of the variable contents?), when PHP doesn't have it and you can ...
51
votes
3answers
19k views

How is a Java reference different from a C pointer?

C has pointers and Java has what is called references. They have some things in common in the sense that they all point to something. I know that pointers in C store the addresses they point to. Do ...
-3
votes
4answers
287 views

What are good strategies in C for dealing with pointer errors of this type?

In C, I often come across errors with code like this prio_queue->head[index] = newEntry; Yields a " "Cannot assign Entry** to Entry* " How do you prevent/debug errors of this type, in general? ...
5
votes
4answers
3k views

What is the difference between a pointer pointing to 0x0 location and a pointer set to NULL?

Is a pointer pointing to 0x0000 the same as a pointer set to NULL? If NULL value is defined in the C language, then what location does it physically translate to? Is it the same as 0x0000. Where can I ...
12
votes
5answers
961 views

How is precedence determined in C pointers?

I've come across two pointer declarations that I'm having trouble understanding. My understanding of precedence rules goes something like this: Operator Precedence ...
4
votes
6answers
1k views

Is it best to minimize using pointers in C?

I think most people would agree that pointers are a major source of bugs in C programs (if not the greatest source of bugs). Other languages drop pointers entirely for this reason. When working in C, ...
3
votes
5answers
1k views

What is the purpose of arrays in C, when pointers could have done the job?

Arrays and pointers are not the same thing in C, although they are related and can be used similarly. So far we all agree. However, I don't see why arrays were included in C, when pointers could have ...
16
votes
10answers
5k views

What is so difficult about pointers/recursion? [closed]

In the perils of java schools Joel discusses his experience at Penn and the difficulty of "segmentation faults". He says [segfaults are difficult until you] "take a deep breath and really try ...
20
votes
10answers
6k views

Why are pointers not recommended when coding with C++

I read from somewhere that when using C++ it is recommended not to use pointers. Why is pointers such a bad idea when you are using C++. For C programmers that are used to using pointers, what is the ...
11
votes
5answers
1k views

If you favor “T *var”, do you ever write “T*”? [duplicate]

Possible Duplicate: int* i; or int *i; or int * i; Thinking about where we place our asterisks; how do those that prefer to keep the "pointerness" away from the type and with the identifier ...
16
votes
12answers
5k views

int* i; or int *i; or int * i; [closed]

What is your favorite method to declare a pointer? int* i; or int *i; or int * i; or int*i; Please explain why. see also: http://www.stroustrup.com/bs_faq2.html#whitespace