Linked Questions
32 questions linked to/from Are negative array indexes allowed in C?
5
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5
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Negative index in array [duplicate]
Possible Duplicate:
Negative array indexes in C?
Can I use negative indices in arrays?
#include <stdio.h>
int main(void)
{
char a[] = "pascual";
char *p = a;
p += 3;
...
- 41.2k
2
votes
3
answers
538
views
Why do arrays with negative indexes work? [duplicate]
Possible Duplicate:
Negative array indexes in C?
How come this compiles, and runs as intended? I'm confused. I was just curious what would happen and to my surprise. It worked.
#include <...
- 4,408
6
votes
2
answers
113
views
Pointer Array in C? [duplicate]
Pointers are a difficult topic for sure, but I have come across this snippet and I just can't figure out what the p[-1] is:
#include <stdio.h>
int main(void) {
int t[10] = { 1, 2, 3, 4, 5,...
- 63
0
votes
3
answers
160
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array indexing with signed number in C [duplicate]
I just want to know is it a good way of programming style.
I know what is happening in this piece of code. look for the first occurrence of href save it next_next and then look for the first ...
user8081549
-1
votes
2
answers
115
views
Why is array[i][-1] == 0? How does one prevent undefined variables from being used? [duplicate]
/**
* fifteen.c
*
* Computer Science 50
* Problem Set 3
*
* Implements Game of Fifteen (generalized to d x d).
*
* Usage: fifteen d
*
* whereby the board's dimensions are to be d x d,
* ...
- 7
-1
votes
2
answers
80
views
Retrieval of values in reverse order using pointers [duplicate]
I understand working of *(p+i), but, what actually is happening at memory level when retrieving values with *(p-i) or p[-i] through printf() function ?
#include <stdio.h>
int main() { ...
- 3
-5
votes
2
answers
122
views
Why isn't this C loop counting from -5 to 19? [duplicate]
I don't know why my program can't count from -5 to 19. Does anyone have a tip for me? Thanks a lot!
int printArray(int array[], int count){
for ( i = 0; i < count; i++)
{
printf(&...
- 13
0
votes
1
answer
85
views
Can someone explain the role of p[-i] printf("%d" , p[-i]) [duplicate]
What I guessed is that in p[-i] it takes the ith position from current pointing one towards the left-hand side.I am just a beginner so is there something more to it.
#include<stdio.h&...
- 1
15
votes
8
answers
13k
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Why does C support negative array indices?
From this post in SO, it is clear that C supports negative indices.
Why support such a potential memory violation in a program?
Shouldn't the compiler throw a Negative Index warning at least? (am ...
- 1,336
24
votes
6
answers
4k
views
Using negative number as array index
I came along a competitive question that asks the output of the following:
#include <stdio.h>
int main()
{
int a[] = {0,1,2,3,4};
int i, *ptr;
for(ptr = a+4, i=0; i <=4; i++)
...
- 1,674
5
votes
8
answers
1k
views
Evaluation of && boolean operator
If i have the following if statement
if ( (row != -1) && (array[row][col] != 10) ) {
....
}
Where row is an int value and array is an int[][] object.
My question is, if this will throw ...
- 11.2k
2
votes
1
answer
3k
views
Negative array index
I have a pointer which is defined as follows:
A ***b;
What does accessing it as follows do:
A** c = b[-1]
Is it an access violation because we are using a negative index to an array? Or is it a ...
- 2,771
4
votes
2
answers
2k
views
Understanding the solution for the Jewelry Topcoder solution
I am fairly new to dynamic programming and don't yet understand most of the types of problems it can solve. Hence I am facing problems in understanding the solution of Jewelry topcoder problem.
I am ...
- 3,302
5
votes
1
answer
808
views
Accessing the -1 element of an array in c
I have an array of structs, which is dynamically allocated. A pointer to this array is passed around to other functions.
struct body{
char* name;
double mass;
// ... some more stuff
...
- 547
3
votes
3
answers
2k
views
What's the meaning of -2[array]
I recently stumbled upon following code
int array[] = {10, 20, 30};
cout << -2[array];
I understand that array is a pointer to the first element of the array but then what does [pointer] means ...
- 368