Hi,
I have written the following program:
-------------------------------------------------------------------------------------------------------------
1 #include <stdio.h>
2 #include "abc.h"
3
4 void PROP_abc(double ptr[TN][TTS])
5 {
6 double ptr1[TN][TTS] = { 0.1936, 0.17273, 0.63634, 0.9429, 5.4393, 0.77277, 0.025127, 0.14202, 0.55906, 0.38984, 0.00, 0.00, 0.6214, 0.12952, 0.45833, 00.53225, 0.017949, 0.57854, 0.16608, 1.0684, 0.31321, 1.198, 0.00, 0.00, 0.00, 0.025592, 0.00, 0.44234, 0.27205, 0.24618,
7 ............
8 ............
9 ............
10 ............
11 ............
12 ............
13 ............
14 ............};
15 for(int i = 0; i < TN; i++)
16 for(int t = 0; t < TTS; t++)
17 ptr[i][t] = ptr1[i][t];
18 return;
19 }
-------------------------------------------------------------------------------------------------------------
where TN and TTS are defined in file abc.h and the numbers on left are the line numbers.
I am getting following errors:
In function void PROP_abc
1. error: expected `}' before numeric constant in line number 6
2. error: expected â,â or â;â before numeric constant in line number 6
At global scope
3. expected unqualified-id before for in line 15
4. expected constructor, destructor, or type conversion before < token in line 15
5. expected constructor, destructor, or type conversion before ++ token in line 15.
6. expected constructor, destructor, or type conversion before < token in line 16
7. expected constructor, destructor, or type conversion before ++ token in line 16
8. expected unqualified-id before return in line 18
9. expected declaration before } token in line 19
I am surprised to see so many errors but fail to see the reason, please help.
Thank you.
10  15749  Laharl 849
Recognized Expert Contributor
You have a 2D array, so each subarray (row) needs to be defined. -
double arr[2][2] = {{2.0, 1.5}, {1.75, 18.32}};
-
Banfa 9,065
Recognized Expert Moderator Expert
TN and TTS are defined somewhere are they?
Line 17 is not going to work because ptr1 is not a 2 dimensional array of double but rather a double **. As such there is no first dimension size required for the compiler to be able to properly calculate the location you are talking about.
Line 17 is not going to work because ptr1 is not a 2 dimensional array of double but rather a double **. As such there is no first dimension size required for the compiler to be able to properly calculate the location you are talking about.
ptr1 is the address of ptr1[0]. ptr1[0] is an array of TTS doubles. Therefore, ptr1 is a pointer to an array of TTS doubles:
double (*ptr1)[TTS];
ptr1 is not a double**.
As to array dimension size, assuming TN and TTS are global constants, the compiler does have all the informaton it needs for pointer arithmetic.
The code as posted compiles OK.
The posted errors are outside the posted code.
Banfa 9,065
Recognized Expert Moderator Expert
ptr1 is the address of ptr1[0]. ptr1[0] is an array of TTS doubles. Therefore, ptr1 is a pointer to an array of TTS doubles:
double (*ptr1)[TTS];
ptr1 is not a double**.
True my mistake I was talking about ptr not ptr1 which is a double ** but is accessed as a 2d array and that highlights the problems with having your variable names too similar.
True my mistake I was talking about ptr not ptr1 which is a double **
ptr is not a double** either. This code:
void PROP_abc(double ptr[TN][TTS])
5 {
6 double ptr1[TN][TTS] = { 0.1936, 0.17273, 0.63634, 0.9429, 5.4393, 0.77277, 0.025127, 0.14202, 0.55906, 0.38984, 0.00, 0.00, 0.6214, 0.12952, 0.45833, 00.53225, 0.017949, 0.57854, 0.16608, 1.0684, 0.31321, 1.198, 0.00, 0.00, 0.00, 0.025592, 0.00, 0.44234, 0.27205, 0.24618,
etc....
shows ptr is an array of TN elements that are TTS arrays of double. That makes ptr a pointer to and array of TTS doubles just like ptr1.
Where is this double** coming from? There's no double** anywhere in the posted code.
Banfa 9,065
Recognized Expert Moderator Expert
ptr is not a double** either. This code:
shows ptr is an array of TN elements that are TTS arrays of double. That makes ptr a pointer to and array of TTS doubles just like ptr1.
Where is this double** coming from? There's no double** anywhere in the posted code.
I believe ptr is a double ** because it is declared as a function parameter. You can't pass arrays as function parameters (or is that something that has changed between C and C++?) and the notation [] used on a function parameter is equivalent to declaration of a pointer rather than declaration of an array.
Laharl 849
Recognized Expert Contributor
It's not a double**. It's a double*[]. There's a difference because the latter implies that all of the rows are the same length (a value the compiler needs to generate valid assembly).
It's not a double**. It's a double*[]. There's a difference because the latter implies that all of the rows are the same length (a value the compiler needs to generate valid assembly).
what are the signs after double; are they for pointer?
Banfa 9,065
Recognized Expert Moderator Expert
what are the signs after double; are they for pointer?
Yes .
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