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PODouble array only stores ints
primarykey
Id
13441423
data
AcceptedAnswerId
13441612
AnswerCount
2
ClosedDate
CommentCount
8
CommunityOwnedDate
CreationDate
2012-11-18T15:15:53.757
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0
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2013-06-26T16:38:34.013
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2012-11-18T17:18:00.150
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1
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2
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text
Body
I have this code here that I think should work, and it does! except for the fact that though I've declared a pointer to an array of type double, it always stores int, and I don't know why. first, I have this struct and it is defined like this: <pre><code>struct thing { int part1; double *part2; }; </code></pre> then I initialize the thing by saying <code>struct thing *abc = malloc (sizeof(struct thing))</code> and <code>part1 = 0</code> and <code>part2 = malloc(sizeof(double))</code>. then, I try to set specific values at specific positions in the array of double. This works fine with integers, but when I tried 0.5, it set the value to 0. when I tried 2.9, it set the value to 2. I really don't know why it does this. code for setValue looks like this: <pre><code>struct thing *setValue (struct thing *t, int pos, double set){ if (t->part1 < pos){ // check to see if array is large enough t->part2 = realloc (t->part2, (pos+1) * sizeof(double)); for (int a = t->part1 + 1; a < pos + 1; a++) t->part2[a] = 0; t->part1 = pos; } t->part2[pos] = set; // ALWAYS stores an integer, don't know why return t; } </code></pre> -- Edit: So there is nothing really mallicious about this part; but here's the rest of my code JUST IN CASE: Relevant functions that operate on my struct thing <pre><code>#include "thing.h" #include <math.h> #include <stdio.h> #include <stdlib.h> struct thing *makeThing(){ // GOOD struct thing *t = (struct thing *) malloc (sizeof(struct thing)); t->part1 = 0; t->part2 = malloc (sizeof(double)); t->part2[0] = 0; return t; } struct thing *setValue (struct thing *t, int pos, double set){ if (t->part1 < pos){ // check to see if array is large enough t->part2 = realloc (t->part2, (pos+1) * sizeof(double)); for (int a = t->part1 + 1; a < pos + 1; a++) t->part2[a] = 0; t->part1 = pos; } t->part2[pos] = set; // ALWAYS stores an integer, don't know why return t; } double getValue (struct thing *t, int pos){ if (pos <= t->part1){ return t->part2[pos]; } return 0; } </code></pre> Header file: <pre><code>#ifndef THING_H #define THING_H struct thing { int part1; double *part2; }; struct thing *makeThing(); struct thing *setValue (struct thing *t, int pos, double set); double getValue (struct thing *t, int pos); #endif </code></pre> main file: <pre><code>#include <stdio.h> #include "thing.h" int main (void) { struct thing *t = makeThing(); setValue (t, 1, -1); setValue (t, 1, -2); setValue (t, 10, 1); setValue (t, 3, 1.5); printf ("%g\n", getValue (t, 0)); printf ("%g\n", getValue (t, 1)); printf ("%g\n", getValue (t, 2)); printf ("%g\n", getValue (t, 3)); printf ("%g\n", getValue (t, 4)); printf ("%g\n", getValue (t, 5)); printf ("%g\n", getValue (t, 6)); printf ("%g\n", getValue (t, 7)); printf ("%g\n", getValue (t, 8)); printf ("%g\n", getValue (t, 9)); printf ("%g\n", getValue (t, 10)); return 0; } </code></pre> On my computer, this prints out: 0 -2 0 1 0 0 0 0 0 0 1 EDIT: Turns out that when I compile it via codeblocks, it works... Ultimately, I am confused.
Tags
<c><casting><int><double>
Title
Double array only stores ints
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USSSaaM
UserOwnerUserId
1. USSSaaM
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PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
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 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PODouble array only stores ints
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PODouble array only stores ints
 UserUserId
 This table or related slice is empty.
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