Questions tagged [predefined-macro]
38 questions
0
votes
0 answers
Visual Studio 2019 - define a pragma or macro in launch.vs.json
I need to define a precompiler element(pragma? macro? not sure how you call them) as DEBUG in a cmake project loaded with VS
{
"version": "0.2.1",
"defaults": {},
"configurations": [
{
"type": "default",
"project":…
pf12345678910
- 141
- 6
0
votes
1 answer
On the confusion of rgb numerical comparison
I wrote a program that gives any RGB value and can find similar colors from the program.
But the result is a little confusing.
The program is a little long, mainly to fill in some RGB data.
The main key points are as follows
//MyColor.h
#pragma…
anti-gravity
- 122
- 6
0
votes
1 answer
Where does predefined macros reside in C?
I wonder where are predefined macros are defined and resided in?
Predefined macros are defined in compiler or preprocessor which has a dictionary that hold the pre-defined macros in the source code.
I mean __FILE__ macro has a definition and…
Nazim
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0
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0 answers
What does this code mean? "#define TO_LITERAL_(text) #text"
When I searched the meaning of __cplusplus, I found a piece of code as following.
#include
int main() {
#define TO_LITERAL(text) TO_LITERAL_(text)
#define TO_LITERAL_(text) #text
#ifndef __cplusplus
/* this translation unit is being…
LittleSoup
- 31
- 1
- 3
0
votes
1 answer
Why compiler gives me error "undefined external symbol" when I don't use libraries?
I've got:
frw_trafic.h:
#define PI 3.14159265
namespace FRW
{
float angleToProperRadians(float angle);
class Car
{
public:
...
void transform(int time = 1);
...
private:
...
float velocDir; // angle in degrees, same as Sector angle
float…
user7108263
0
votes
1 answer
Is there Predefined-Macros define about byte order in armcc
Is there Predefined-Macros define about byte order in armcc.
I am a novice on the armcc.and sorry for my English.
In gcc these are macros:
__BYTE_ORDER__
__ORDER_LITTLE_ENDIAN__
__ORDER_BIG_ENDIAN__
__ORDER_PDP_ENDIAN__
...
Now I have to use…
zodiac1111
- 179
- 1
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0
votes
4 answers
Why my macro doesn't compile?
#define LINE_FILE ("Line"#__LINE__"of file"__FILE__)
int main(void)
{
printf("%s", LINE_FILE);
}
What I expected:
LINE_FILE = "Line linenumber of file filename"
and printf() can output this…
SPiCaRia
- 121
- 10
0
votes
2 answers
base file name from __FILE__
I need the file name only where the __FILE__ and __FILEW__ macros return the whole path.
I defined the following:
#define __FILE_NAME_ONLY__ (strrchr(__FILE__, '\\') ? strrchr(__FILE__, '\\') + 1 : __FILE__)
I am using it as follows:
#define…
Saher Ahwal
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