num=0;k=0;
while(str[i]>=48 && str[i]<=57)
num=num+(str[i]-'0')*pow(10,k++);
-68
Hsn
Hsn
anyone know to solve strings of mathematical expression into an integra
Im thinking u may want to look into finite state machine .. it might give you idea how to write your own parser
coal
coal
a state machine will allow you to read the input and have a meaningful context of what you're expecting to parse
coal
for example, you could start in a state 0 to read a value and 1 for operators, then based on that context you can classify the characters you're reading to serialize them into something you can work with
Hima
It wont parse negative number .. first number is negative not an operator
sure correct , put some checks and it will be fine
Anonymous
Hey guys, I saw a really weird form of an IF statement. It's condition part has a block statement. it looks like the following code segment.
if (({int a = 0; int b = a + 3; b > 0;})) {
// do whatever you want
}
My question is "How this could work?"
, I never saw an IF condition part have a block statement before...😰
Suka
Hey guys, I saw a really weird form of an IF statement. It's condition part has a block statement. it looks like the following code segment.
if (({int a = 0; int b = a + 3; b > 0;})) {
// do whatever you want
}
My question is "How this could work?"
, I never saw an IF condition part have a block statement before...😰
{ do everything here ; and here; and here ; and here ;return the last; } // and keep all variable(if any) isolated.
cmiiw
Igor🇺🇦
Hey guys, I saw a really weird form of an IF statement. It's condition part has a block statement. it looks like the following code segment.
if (({int a = 0; int b = a + 3; b > 0;})) {
// do whatever you want
}
My question is "How this could work?"
, I never saw an IF condition part have a block statement before...😰
The results of the last expression is result of the block.
Please don't use this kind of code. That's what lambdas are for.
Anonymous
Thanks for all your explanations.👏
itsmanjeet
I have a vector<int> of size(1024)
Then i take the iterator
vector<int>::iterator Iter = vec.begin()
Then what i know is
Iter == pointer to the first value (currently)
*Iter == first value
Then what the Iter[0] denotes
Pavel
I have a vector<int> of size(1024)
Then i take the iterator
vector<int>::iterator Iter = vec.begin()
Then what i know is
Iter == pointer to the first value (currently)
*Iter == first value
Then what the Iter[0] denotes
iter[N] points to an element N elements away from iter.
For zero it's the same element. For one it's the next element.
I think it's done this way to mimic behaviour of raw pointers pointing to array elements.
itsmanjeet
Ok mean
vec = [1, 2, 3, 4]
iter = vec.begin() + 2
iter[0] = 3
iter[1] = 4
iter[-1] = 2
If i understand the thing correctly ?
Pavel
Ok mean
vec = [1, 2, 3, 4]
iter = vec.begin() + 2
iter[0] = 3
iter[1] = 4
iter[-1] = 2
If i understand the thing correctly ?
I think this is correct (haven't used it myself)
itsmanjeet
Thanks
Yamu
Hello guys I am a newbie here
Yamu
I have a problems with c programming
Yamu
#include<stdio.h>
int main(){
int i; //used to count loop
int n; //Size of array
int position; //The array location where you want to delete
int array[n];
//let user to input the size of array
printf("1.Please input the size of array n:");
scanf("%d",&n);
//let user input the element of array
printf("2.Please input the elements of array:\n");
for(i=0; i<n; i++){
printf("Array[%d]: ",i);
scanf("%d",&array[i]);
}
n = n-1; //Decrease a speac of array after deletion
for(i=n-1; i>=position; i--){
array[i-1] = array[i];
}
printf("The result after deletion is:");
for(i=0; i>n; i++){
printf("Array[%d] = %d", i, array[i-1]);
}
return 0;
}
Yamu
when i output it, it show nothing
Yamu
--------------------------------
Process exited after 4.59 seconds with return value 3221225725
Press any key to continue . . ..
Yamu
There is no error occur when i compiled it
Yamu
Please help me! : )
Ethan
#include<stdio.h>
int main(){
int i; //used to count loop
int n; //Size of array
int position; //The array location where you want to delete
int array[n];
//let user to input the size of array
printf("1.Please input the size of array n:");
scanf("%d",&n);
//let user input the element of array
printf("2.Please input the elements of array:\n");
for(i=0; i<n; i++){
printf("Array[%d]: ",i);
scanf("%d",&array[i]);
}
n = n-1; //Decrease a speac of array after deletion
for(i=n-1; i>=position; i--){
array[i-1] = array[i];
}
printf("The result after deletion is:");
for(i=0; i>n; i++){
printf("Array[%d] = %d", i, array[i-1]);
}
return 0;
}
From a quick look, your last 'for' loop has a wrong end condition. Also try running array[i]
Ethan
Your loop logic is off, try rethinking a better solution
Pavel
#include<stdio.h>
int main(){
int i; //used to count loop
int n; //Size of array
int position; //The array location where you want to delete
int array[n];
//let user to input the size of array
printf("1.Please input the size of array n:");
scanf("%d",&n);
//let user input the element of array
printf("2.Please input the elements of array:\n");
for(i=0; i<n; i++){
printf("Array[%d]: ",i);
scanf("%d",&array[i]);
}
n = n-1; //Decrease a speac of array after deletion
for(i=n-1; i>=position; i--){
array[i-1] = array[i];
}
printf("The result after deletion is:");
for(i=0; i>n; i++){
printf("Array[%d] = %d", i, array[i-1]);
}
return 0;
}
Not related to your question, but it's better to declare variables closer to first use (and limit their scope), for example instead of declaring i at the beginning of the scope of main function you could declare it inside for loop
for (int i = 0; i < n; i++).
It's not Pascal where you have to declare all variables in advance, and it's not Java where you cold benefit from reusing variables (still not ints though).
Yamu
Thank You guys for your helping!!
Yamu
I will try it as you guys told thank you..
Null
!report
\Device\NUL
\Device\NUL
That's not how dynamic array works in C, stack allocated array once its created, it can't be resized
\Device\NUL
Please don't PM Teb
𝕷𝖔𝖗𝖊𝖓𝖟𝖔
Hi guys, happy holidays;
I'm writing a program and I have the need to delete one element from an array of integers in C. My question is: do I need to use dynamic memory management? Because that seems pretty fair to me to be honest, but I've seen some tutorials on the internet that don't use realloc() or any other dynamic Memory management function. So I'm a little bit confused
Yamu
let me try it thank you
𝕷𝖔𝖗𝖊𝖓𝖟𝖔
Hi guys, happy holidays;
I'm writing a program and I have the need to delete one element from an array of integers in C. My question is: do I need to use dynamic memory management? Because that seems pretty fair to me to be honest, but I've seen some tutorials on the internet that don't use realloc() or any other dynamic Memory management function. So I'm a little bit confused
Like, if my array is
Int *arr= (1,2,3,4,5}
And I want to remove 2,3 I have
arr= {1,4,5}
But now the array is smaller. So it does fit in the previous memory region allocated for it when declaring the array, but I'm wondering if this could lead to problems in much more complex softwares
\Device\NUL
Hi guys, happy holidays;
I'm writing a program and I have the need to delete one element from an array of integers in C. My question is: do I need to use dynamic memory management? Because that seems pretty fair to me to be honest, but I've seen some tutorials on the internet that don't use realloc() or any other dynamic Memory management function. So I'm a little bit confused
Heap is heavier than stack, cmiiw.
I prefer allocate memory as much (not vla) as i need than dynamic allocation
𝕷𝖔𝖗𝖊𝖓𝖟𝖔
Ok so basically I'm just saying that since I'm reducing array size it will surely fit the memory region allocated earlier
𝕷𝖔𝖗𝖊𝖓𝖟𝖔
Heap is heavier than stack, cmiiw.
I prefer allocate memory as much (not vla) as i need than dynamic allocation
I can see why, the complexity increases with dynamic memory management
mahdi13
Hello
In the switch, I want to check two values in a case like this
case 'a' || 'A':
...
break;
If the user enters a or A, this case will run, but as I wrote, it don't work
how can I do that?
writ separate case for each one?
𝕷𝖔𝖗𝖊𝖓𝖟𝖔
\Device\NUL
Thank you for your help!
Welp, stack memory is limited, use dynamic allocation for big memory usage instead
\Device\NUL
Hello
In the switch, I want to check two values in a case like this
case 'a' || 'A':
...
break;
If the user enters a or A, this case will run, but as I wrote, it don't work
how can I do that?
writ separate case for each one?
You can do like this
case 'a': case 'A': /*stuff*/; break;
Or
case 'a':
/* FALLTHROGH */
case 'A':
/*stuff*/
break;
mahdi13
You can do like this
case 'a': case 'A': /*stuff*/; break;
Or
case 'a':
/* FALLTHROGH */
case 'A':
/*stuff*/
break;
or like this
ch = toupper(ch);
...
case 'A':
...
break;
thank you for your help
Hades
decltype vs auto, what's the difference?
Ömer Faruk Aydın
Hello there, i have a question: I've been working on swapping 2 words in a string.(In C language) However using another array is not allowed. Basically code should look something like this: int main()
{
char str[SIZE];
printf("Enter 2 words: ");
sgets(str);
printf("[%s]\n", str); // [hello friend]
//code
printf("[%s]\n", str); // [friend hello]
}
Igor🇺🇦
decltype vs auto, what's the difference?
decltype returns the type of expression in it
auto deduces the type of the declared variable.
Ömer Faruk Aydın
Hello there, i have a question: I've been working on swapping 2 words in a string.(In C language) However using another array is not allowed. Basically code should look something like this: int main()
{
char str[SIZE];
printf("Enter 2 words: ");
sgets(str);
printf("[%s]\n", str); // [hello friend]
//code
printf("[%s]\n", str); // [friend hello]
}
I've tried printing the characters in different order and it worked but that does not count because i didn't change "str" variable.
Ömer Faruk Aydın
I'd really appreciate if anyone can give me tips for the algorithm
S__R
I've tried printing the characters in different order and it worked but that does not count because i didn't change "str" variable.
Try to reverse whole string then reverse individual words
João
Hi
João
Anyone can help me?
Suka
I'd really appreciate if anyone can give me tips for the algorithm
char test[] = {"one two"};
char *var1 = strchr(test, ' ');
int var2 = var1 - (test);
printf("%s %.*s\n", test + (var2 + 1), var2, test);
Prince Of Persia
is there anyway to get all input from a istream object as iterators or as string ? (without getting line by line in while loop)
Prince Of Persia
Prince Of Persia
But two or three times slower than getting line by line
Anonymous
how can I read the numbers in keyboard with c
Morsal
Hi all, I have question.
What computers that used by giant companies such as Google and Facebook?
Anonymous
how can I read the numbers in keyboard with c
in python we use
n=input('give me number')
is that possible in c
to write in screen message and same time return value??
🙏
Cri | ferrosxlupus
in python we use
n=input('give me number')
is that possible in c
to write in screen message and same time return value??
🙏
Don't talk about python in this group
Anonymous
in python we use
n=input('give me number')
is that possible in c
to write in screen message and same time return value??
🙏
simple answer: no
you can write function that doesnthat very easily with getchar and putchar in c and thats what python does in the background (and makes a bunch of other assumptions that makes the language so high-level and (imo) shit)
Anonymous
you can use
printf("Enter a number: "); scanf("%d", &a);
Ludovic 'Archivist'
Hi all, I have question.
What computers that used by giant companies such as Google and Facebook?
They use all matters of computer architectures and systems. They strive to use the best (cheapest) tool for the right job
Ludovic 'Archivist'
They have the money that affords these amounts of cost optimization. On the other side of the spectrum, I can only use the best tools available *to me* for the job, which is often X86_64 and AVR or some suboptimal flavour of ARM
Ludovic 'Archivist'
😭
Morsal
They use all matters of computer architectures and systems. They strive to use the best (cheapest) tool for the right job
You're right ... That is it ..
But I think they use supercomputers as main computer for management and compiling .. Is ti ?
Ludovic 'Archivist'
You're right ... That is it ..
But I think they use supercomputers as main computer for management and compiling .. Is ti ?
No, they use convenience (read cheap custom) servers, they just use thousand of them. They subdivide their services
They try to avoid services getting big enough to require a server farm to compile but when they do, they use distcc.
Very large companies don't have the affordance to fail. As such they cannot use a big centralized system but use piecemeal bit spread on hundreds of servers so that say a rack or two catching fire is never a problem
Morsal
No, they use convenience (read cheap custom) servers, they just use thousand of them. They subdivide their services
They try to avoid services getting big enough to require a server farm to compile but when they do, they use distcc.
Very large companies don't have the affordance to fail. As such they cannot use a big centralized system but use piecemeal bit spread on hundreds of servers so that say a rack or two catching fire is never a problem
Hmmmm, thank you so much. these really important words of you .. I was wondering about these points and i have already searched... So thank you again.
L.Ashurmatov
Hi, everyone
How to find time implementation of code in c programming language
For example cpp have a library ctime to find implementation time but I didn't find in c programming language?
For instance
In python for that have time library
Start = time.time()
..
..
End = time.time()
In the end
End - start if I'm not mistaken
Suka
Hi, everyone
How to find time implementation of code in c programming language
For example cpp have a library ctime to find implementation time but I didn't find in c programming language?
For instance
In python for that have time library
Start = time.time()
..
..
End = time.time()
In the end
End - start if I'm not mistaken
https://aras-p.info/blog/2019/01/12/Investigating-compile-times-and-Clang-ftime-report/
Suka
Hi, everyone
How to find time implementation of code in c programming language
For example cpp have a library ctime to find implementation time but I didn't find in c programming language?
For instance
In python for that have time library
Start = time.time()
..
..
End = time.time()
In the end
End - start if I'm not mistaken
ooo you mean time duration during run time not for compile time. try this
https://stackoverflow.com/questions/29552932/how-do-i-get-time-duration-in-c
?
@SilhouetteInDark why do you think are function declarations there in C and C++ ? why we need to write a function declaration on top of a function call when the actual function definition is below that function call
L.Ashurmatov
Ömer Faruk Aydın
Try to reverse whole string then reverse individual words
It worked! Thank you very much😊
Vishal
Given a string, how many different substrings exist
in it that have no repeating characters? Two
substrings are considered different if they have a
different start or end index.
Example
S = "abac"
The substrings that have no repeating characters in
them are "a", "b", "a", "c", "ab", "ba", "ac", and "bac".
Note that "aba" and "abac" do not qualify because
the character 'a'is repeated in them. Also note that
two substrings, "a" and "a", both qualify because
their start indices are different: s[0] and s[2]. There
are 8 substrings that have no repeating characters.
crintion
ho ritor