#include<iostream>
#include<bits/stdc++.h>
using namespace std ;
int main(){
int t ;
cin >> t ;
while (t>0)
{
int n ;
cin >> n ;
int fact = 1 ;
for (int i = 1; i <= n; i++)
{
fact = fact * i ;
}
cout << fact << endl ;
t--;
}
return 0 ;
}
There are lots of problems with the code...
int might not be enough for fact... you could go for long.
fact = fact * i; can be written as fact *= i;
Talula
Anonymous
Ok thanks sir ...
Anonymous
I ll try it now and let you know .. the output
Anonymous
Not accepting code again i might send you the whole question
Talula
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main(){
int t;
cin >> t;
while (t>0)
{
int n;
cin >> n;
unsigned long fact = 1;
for (int i = 1; i <= n; i++)
{
fact *= i;
}
cout << fact << endl;
t--;
}
return 0;
}
Anonymous
Talula
Your program doesn't do anything like that.
Anonymous
Its a factorial program i guess .
Anonymous
Apk
labyrinth
are there other implementation on polymorphism with c++ other than virtual functions and vtables ?
Alex
are there other implementation on polymorphism with c++ other than virtual functions and vtables ?
there is static polymorphism(templates, function overload).
Talula
Talula
You'll have to do it yourself... not going to tell you how to do it.
Anonymous
Ok ......
Anonymous
I got the problem ..
Anonymous
And its easy to sotre that value in the array thanks for the help sir .
MicroNG
Starting c++ lecture series. Can see IT and CS learning
Henry
Hi please my system() is not working
Henry
What do i do?
Talula
Hi please my system() is not working
system()? What, where, how, when... in other words, what are you talking about?
Henry
When i system("dir")
Nothing shows up
V01D
Henry
hastebin
https://hastebin.com/
Anonymous
Can someone help provide a more efficient code for this?
Anonymous
#include <iostream>
using namespace std;
int main()
{
int num1, num2, num3;
cout << "Input 3 numbers with spaces between then press enter!" << endl;
cin >> num1 >> num2 >> num3;
if ((num1 <= num2) && (num1 <= num3) && (num2 <= num3))
cout << "The numbers in ascending order is: " << num1 << " " << num2 << " " << num3 << endl;
else if ((num2 <= num1) && (num2 <= num3) && (num1 <= num3))
cout << "The numbers in ascending order are: " << num2 << " " << num1 << " " << num3 << endl;
else if ((num3 <= num1) && (num3 <= num2) && (num2 <= num1))
cout << "The numbers in ascending order are: " << num2 << " " << num1 << " " << num3 << endl;
else
cout << "The numbers in ascending order are: " << num3 << " " << num1 << " " << num2 << endl;
return 0;
}
Anonymous
This is my solution to a question requiring 3 numbers from a user input to be arranged in ascending order but I feel that my solution is not practical in the case where input is huge.
Anonymous
Thought about using the switch case but was limited by the constant expression or maybe I just don't know how to go about it
Anonymous
#include <iostream>
using namespace std;
int main()
{
int num1, num2, num3;
cout << "Input 3 numbers with spaces between then press enter!" << endl;
cin >> num1 >> num2 >> num3;
if ((num1 <= num2) && (num1 <= num3) && (num2 <= num3))
cout << "The numbers in ascending order is: " << num1 << " " << num2 << " " << num3 << endl;
else if ((num2 <= num1) && (num2 <= num3) && (num1 <= num3))
cout << "The numbers in ascending order are: " << num2 << " " << num1 << " " << num3 << endl;
else if ((num3 <= num1) && (num3 <= num2) && (num2 <= num1))
cout << "The numbers in ascending order are: " << num2 << " " << num1 << " " << num3 << endl;
else
cout << "The numbers in ascending order are: " << num3 << " " << num1 << " " << num2 << endl;
return 0;
}
Turns out that I needed more else if statements to make the code work for all arrangements. This is the worst solution to the question.
Igor🇺🇦
Turns out that I needed more else if statements to make the code work for all arrangements. This is the worst solution to the question.
Can't you store inputs in a vector and use std::is_sorted?
Anonymous
Can't you store inputs in a vector and use std::is_sorted?
Well, I am a novice in c++ and I haven't gotten to vectors yet.
Anonymous
Not yet an array expect, I am going strictly by a textbook
Igor🇺🇦
If you know how many numbers you have you can use either C array or std::array
Anonymous
I will be sure to consider that when I study arrays
Anonymous
Thanks
Andrey
Why do I get segmentation fault?
#include <stdio.h>
#include <string.h>
#define LENGTH 10242
int main(int argc, char **argv)
{
char buffer[LENGTH][LENGTH];
for (int i=0; fgets(buffer[i], LENGTH, stdin) != NULL; i++) {
printf("%s", buffer[i]);
}
for (int i=0; buffer[i] == 0; i++) {
printf("%s", buffer[i]);
}
}
Vlad
Ammar
Why do I get segmentation fault?
#include <stdio.h>
#include <string.h>
#define LENGTH 10242
int main(int argc, char **argv)
{
char buffer[LENGTH][LENGTH];
for (int i=0; fgets(buffer[i], LENGTH, stdin) != NULL; i++) {
printf("%s", buffer[i]);
}
for (int i=0; buffer[i] == 0; i++) {
printf("%s", buffer[i]);
}
}
You are a victim of stack overflow.
Default RLIMIT_STACK is roughly 8 MB.
Andrey
>10242 * 10242 char array
duh
how can I after giving values to buffer[10242][100] can reassign them?
Mдtt
Which is the Linux limit on the total number of symlinks that a single file can traverse? (e.g. in Linux 2.6 the limit is 40 symlinks).
Vlad
how can I after giving values to buffer[10242][100] can reassign them?
seems like you need dynamic allocation
Vlad
there's calloc and realloc)
Ammar
Why do I get segmentation fault?
#include <stdio.h>
#include <string.h>
#define LENGTH 10242
int main(int argc, char **argv)
{
char buffer[LENGTH][LENGTH];
for (int i=0; fgets(buffer[i], LENGTH, stdin) != NULL; i++) {
printf("%s", buffer[i]);
}
for (int i=0; buffer[i] == 0; i++) {
printf("%s", buffer[i]);
}
}
Also this comparison buffer[i] == 0 does not make sense.
buffer[i] will never be null, it will always have effective address greater than previous element.
Andrey
Ammar
Why do I get segmentation fault?
#include <stdio.h>
#include <string.h>
#define LENGTH 10242
int main(int argc, char **argv)
{
char buffer[LENGTH][LENGTH];
for (int i=0; fgets(buffer[i], LENGTH, stdin) != NULL; i++) {
printf("%s", buffer[i]);
}
for (int i=0; buffer[i] == 0; i++) {
printf("%s", buffer[i]);
}
}
I am sure the second loop does not run.
Of course the first loop will work.
Ammar
how can I after giving values to buffer[10242][100] can reassign them?
You can do the same as the first loop.
Just assign a value to it, it will overwrite the value.
Andrey
Andrey
Andrey
How could you say it work?
Which are your inputs and your program outputs?
it was the input data from a text file, and i see this output in terminal 🤔
Ammar
it was the input data from a text file, and i see this output in terminal 🤔
That's only the first loop.
Ammar
The second won't run.
Andrey
ah, yes, you are right
Andrey
how can i fix it?
Ammar
I don't know what are you going to do. So I don't have a clue what advice should I give.
Ammar
Please explain your need.
Andrey
Ammar
I would prefer to discuss technical thing on the group.
Andrey
ok, so I want to read data from a text file, to work with this data, and then print it to another file
Ammar
ok, so I want to read data from a text file, to work with this data, and then print it to another file
So we can conclude you want to copy file a to file b?
Ammar
or append the content?
Andrey
So we can conclude you want to copy file a to file b?
I'll give you example
for instance, i am running my program like:
./prog drow 5 acol 3 < text.txt > text2.txt
drow - delete row
acol - append columns
and I want to save all the data in an array to later work with and after the work is done to save it to the new file
Ammar
I'll give you example
for instance, i am running my program like:
./prog drow 5 acol 3 < text.txt > text2.txt
drow - delete row
acol - append columns
and I want to save all the data in an array to later work with and after the work is done to save it to the new file
Still, I can't get the point.
ברני
Hey, I had to do a function array on a task, But I don't understand why it won't compile, the error says that the problem is the scanf but I don't understand why,,,https://onlinegdb.com/rJsAPDYFP
Ammar
Hey, I had to do a function array on a task, But I don't understand why it won't compile, the error says that the problem is the scanf but I don't understand why,,,https://onlinegdb.com/rJsAPDYFP
It seems just a typo.
You wrote sacnf instead of scanf.
Andrey
Still, I can't get the point.
I have to make the program which must do:
Table modifications cause the table, rows and columns to be enlarged or reduced. Multiple commands can be entered to edit the table. In this case, multiple command line arguments will be specified as a sequence:
Table editing commands:
irow R - inserts a table row before row r > 0 (insert-row).
arow - adds a new table row to the end of the table (append-row).
drow R - deletes row number r > 0 (delete-row).
drows N M -deletes rows n to M (N <= m). In the case of N = m, the command behaves the same as drow n.
icol C -inserts an empty column before the column given by the number C.
acol - adds an empty column after the last column.
dcol C -deletes column number C.
dcols N M - deletes columns N to M (N <= m). In the case of N = m, the command behaves in the same way as dcol n.
and I do not have idea what is the best approach to this problem is, i tried to do this:
char buffer[LENGTH]
for (int i = 0; fgets(buffer, LENGTH, stdin) != NULL; i++) {
for (int x = 1; x < argc; x++) {
if (strcmp(argv[x], "drow") == 0) { deleting row here }
if (strcmp(argv[x], "acol") == 0) { adding column here }
}
printf("%s", buffer);
}
but at some point it is difficult to make some functions
Anonymous
How to print every word of a string individually
like the first word when we want
similarly the second word when we want
Ammar
I have to make the program which must do:
Table modifications cause the table, rows and columns to be enlarged or reduced. Multiple commands can be entered to edit the table. In this case, multiple command line arguments will be specified as a sequence:
Table editing commands:
irow R - inserts a table row before row r > 0 (insert-row).
arow - adds a new table row to the end of the table (append-row).
drow R - deletes row number r > 0 (delete-row).
drows N M -deletes rows n to M (N <= m). In the case of N = m, the command behaves the same as drow n.
icol C -inserts an empty column before the column given by the number C.
acol - adds an empty column after the last column.
dcol C -deletes column number C.
dcols N M - deletes columns N to M (N <= m). In the case of N = m, the command behaves in the same way as dcol n.
and I do not have idea what is the best approach to this problem is, i tried to do this:
char buffer[LENGTH]
for (int i = 0; fgets(buffer, LENGTH, stdin) != NULL; i++) {
for (int x = 1; x < argc; x++) {
if (strcmp(argv[x], "drow") == 0) { deleting row here }
if (strcmp(argv[x], "acol") == 0) { adding column here }
}
printf("%s", buffer);
}
but at some point it is difficult to make some functions
In this case, I would have created a struct and directly read/write to the file. So it directly fits in the memory, no need to parse.
Also I would use mmap, so I can cast the mapped memory to the struct and manage them as array.
ברני
Hey again, I had a typo mistake on my code first, but now it's seems my last function doesn't work right.. it suppose to put the even numbers from the first and second array in to the third.. can any one give me a hint why it doesn't work please? https://onlinegdb.com/B16X5DtYv
Winkee
does anyone know of a open network library that support c++20's coroutine
Andrey
In this case, I would have created a struct and directly read/write to the file. So it directly fits in the memory, no need to parse.
Also I would use mmap, so I can cast the mapped memory to the struct and manage them as array.
can you write me please an example of a struct look like?
Ammar
can you write me please an example of a struct look like?
I don't have time to write the example. As I will have to work on the next few minutes.
But here are the references you can look for:
1. C/C++ struct.
2. man 2 mmap.
3. man 2 open.
For the man, if you use Linux, you can just type it on your terminal. Linux distribution usually comes with Linux Programmer's Manual.
Feel free to come back here and ask for your problem.
You can ask me again to write the example later.
Anonymous
If the first condition is satisfied, I want to get the (k + 1) th number from the file and print it, if the second condition is satisfied, I want to get the (k + 2) th number from the file and print it. In the loop, k increases by 1,2,3,4.How to do this without cursor and array.(There are only as many numbers ,new Lines and spaces in the file that I don't know)