I found, a statement, int &a = 1; the statement can be built in QT Creator, mingw_64. while on Programiz: Learn to Code for Free[^] Got,

gcc /tmp/BlXEG8NqhU.c -lm
/tmp/BlXEG8NqhU.c: In function 'main':
/tmp/BlXEG8NqhU.c:6:15: error: expected identifier or '(' before '&' token
6 | const int &a = 2;

so the int &a = 1; is that right? a is a bias name of "1" in rodata?

Thanks, it's a big project, i found the issue,

new 1 (33 hits)
XXX_Global.h: error: conflicting types for 'uint32_t'
Line 17: typedef unsigned int uint32_t;
gcc-6.3-arm32-eabi\arm-none-eabi\include\sys\_stdint.h:48:20: note: previous declaration of 'uint32_t' was here
Line 24: typedef __uint32_t uint32_t ;

there are 2 tyepdef uint32_t

I got the conflicting types error when I built the code, while, i searched the workspace, i only found one tyepdef, Shrink ▲ Copy Code typedef unsigned int uint32_t; in Eclipse, search:typedef*uint32_t i can't find where there is another typedef * uint32_t. Please help to give some ideas.

I got the conflicting types error when I built the code, while, i searched the workspace, i only found one tyepdef,

typedef unsigned int uint32_t;

in Eclipse, search:typedef*uint32_t i can't find where there is another typedef * uint32_t. Please help to give some ideas.

Hi, I found the following define statement, compiler reported error, not very understand, need some helps. :)

/*test comment*/
#define SM_INT(dptr, off) \
/*test comment*/
(unsigned int)( (((unsigned int)(dptr[(off)]) & (unsigned int)0x000000FFU) << 8U) \
/*test comment*/
| (((unsigned int)(dptr[(off)+1U]) & (unsigned int)0x000000FFU)) )

Error is: compiler requires a type specifier for all decalarations; user of undeclared identifier "dptr"

Hi, I read a block of code, like:

class Graph
{
public:
int V; // number of vertices
vector *adj; //adjacency list

Graph(int V);
void addEdge(int x, int y);
bool isRoute(int x, int y);

};

// Constructor
Graph::Graph(int V)
{
this->V = V;
this->adj = new vector[V];
}

// add a directed edge from x to y
void Graph::addEdge(int x, int y) {
adj[x].push_back(y);
}

int main() {

Graph g(6);
g.addEdge(5, 2);
g.addEdge(5, 0);
g.addEdge(4, 0);
g.addEdge(4, 1);
g.addEdge(2, 3);
g.addEdge(3, 1);

}

I wonder the adj is a pointer that points to a Vector object, and a vector object I think it's like an one-dimensional array, but the addEdge() operation, adj[x].push_back(y),it make another array[x,y]. in Main(), the structure of the vector object, seems like: [5,2,0] [4,0,1] [2,3] [3,1] Then this is not an one-dimensional array.so this is a Vector object, or 4 vector objects? Thanks

Sure, the code is embedded software code, no OS, so, do you think there is a better way to implement the condition variable?

So use While(cx != True) ; similar code could resolve it?

Why the above code could be deadlock. thanks

can you explain a little more ? thanks

Hi, I wrote a small c program on a microcontroller, 32bit. I met a weird problem. I wrote code like:

const char strtest[] = "Test123\r\n"; //Global
UART_print(strtest); //in a loop

the output is fine, I can see the output on Teraterm(RS232 interface tool), like: Test123 Test123 .. But when I try code:

char str123[] = "Test123\r\n"; //Global
UART_print(strtest); //in a loop

The output is only the first element: TTTTTTTT Any hint is appreciated.

in fact, it's snprintf() reason. snprintf seems fill out the gap in a string with '\0'. the code like:

memset (msgArray, ' ', 100);
snprintf (msgArray, 2, "%d", 1);
snprintf (messageArray+10, 33, "%s", "main");

I assume the string should output like: 1 main but debugged it. it is : 1,\0, ' ', ' ', .. main, \0, ..

Thanks, ' ' and 32 work. in fact, it's snprintf() reason. snprintf seems fill out the gap in a string with '\0'.

Hi, I want to fill out a char array with space. like:

memset(msgArray, '*', 100);

but '*' should be a Space key.