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Hello,

I'm learning one embedded system course online, and while watching one of those video, I had some doubts about pointer arithmetic,

while I was searching for answers I came across this...

Hello
I have been trying to understand the code used in GcodeCNCDemo4AxisRAMPS, especially the algorithm used to draw a line. I have been reading several articles on Bresenham's line algorithm....

How come? here a is changing inside. So how could compiler ignore it.



Like when counter value reaches til a certain value?

eg:

if TCINT is a counter

Hello,
I have some doubts about compiler optimizing C code. This is more related to the field of embedded system.



int a, b;

void experiment() {
a = 8;
b = a * 7;

But the following code works


#include<stdio.h>

int a = 10, b = 20, c = 50, i;


int *arrop[3] = {&a, &b, &c};

SO how can I make above program work if it's global. I tied putting const before array


const int *arrop[3] = {p, &b, &c};

Where can I find more details about it?

Hello,

When an array pointers created inside the main, program works. But when I intialize array of pointers outside main, compiler gives error as

Initializer element is not constant

This...

In coming videos, he's using this method. I tried that code. But first variable is some junk value. I tried to understand his code by makeing a spreadsheet and trying to poin to various address,...

Tutorial - Google Drive

This is the link to the video.

Like I said further videos in this series make use of this tutorial

Hello.

I'm learning about creating a queue using double link list using a video tutorial. I wrote this code as seen in the video. I don't have the source file shown in the video. I checked the...

So when I assign memory using malloc(). they are placed in read and write memory, right??

So to sum up

When do as follows


int *p = 5;

here value 5 is treated as an address

Here I'm assigning s to "Hello"


char *s = "Hello";
s[0] = '0';

But this crashes program too

Why doing something like this okay



char *s;
s = (char *)malloc(100);
s[0] = 0;


but this crashes my program

This is &(ptr + i)->age in fact same as this &((ptr + i)->age)


That makes sense

Thanks

Thanks for the reply



Does this mean,


Int *p = 7

here 7 is treated as address, not as value??

Hello,

Some way the pointers are used confuses me.

When use as below


int a = 5;
int *p = &a;

#include <stdio.h>


typedef enum {
GREEN = 0,
BLUE
}COLOR;


typedef struct{

So just like creating a structure variable we can create a function that return a structure.

Can you show a simple example to me??

Hello,

I'm following this video Tic Tac Toe using c - YouTube to develop a Tictactoe game. In which the developer is using a structure and it's declared like this


struct myDataType {
...

Thanks for clarifying the difference

I understand how this works


struct person x;
scanf("%s%d%f", x.name, &x.age, &x.weight);

That was my question, need of & in ptr, even though ptr is already the address

In the first answer i got for this post

So, back to your question. It looks like &(ptr+i)->name is actually wrong....

changing this


for(i =0; i < num;++i)
{
printf("Enter name, age and weight of the person respectively:\n");
scanf("%s%d%f",&(ptr+i)->name,&(ptr+i)->age,&(ptr+i)->weight);
}

#include<stdio.h>
#include<stdlib.h>
struct person {
int age;
float weight;
char name[30];
};

int main()
{

Thanks for the reply.

Reason for I used %d instead of %p;

I'm learning some advanced topics of c from a Udemy course "Advanced C programming : pointers". In which instructor uses %d. The...