objects points to a location in memory
I dont think the problem is about pointers because when I add the values by myself like this there is no problem (Mail newMail={"Kaan","k","aaa","123","DEF"};)
Kaan
Andrew
it depends if you want to use new statement or not
Pavel
I dont think the problem is about pointers because when I add the values by myself like this there is no problem (Mail newMail={"Kaan","k","aaa","123","DEF"};)
What's the difference with the code above? Are you sure that the variables you set are not NULL?
Andrew
I dont think the problem is about pointers because when I add the values by myself like this there is no problem (Mail newMail={"Kaan","k","aaa","123","DEF"};)
but i dont think this is the correct way to assign the values
Andrew
i dont remember well the sintax but i think it should be like this Mail newMail{"Kaan","k","aaa","123","DEF"}; but you should use new stament
Pavel
but my code has a problem when I create the new Mail it becames NULL
And also how you check that it becomes NULL?
Andrew
objectype *yourobject = new objectype{param1,param2};
Pavel
Because if it's a struct (not a pointer), then its memory is the memory of its members basically.
Kaan
printf("%s",newMail->message);
Kaan
this is how I assign Mail newMail={senderAdress,getterAdress,subject,date,encryted};
Kaan
I am sure inside variable are not NULL
Kaan
I tried to print them also
Pavel
And code of the struct itself
Kaan
char senderAdress[40];
printf("Enter your user mail adress:");
fflush(stdout);
scanf("%s",senderAdress);
char getterAdress[40];
printf("Enter the getter adress");
fflush(stdout);
scanf("%s",getterAdress);
char date[11];
printf("Enter the date:");
fflush(stdout);
scanf("%s",date);
char subject[20];
printf("Enter the subject:");
fflush(stdout);
scanf("%s",subject);
char message[250];
printf("Enter the message:");
fflush(stdout);
scanf("%s",message);
char encryted[250];
encryptTheMesage(encryted,message,returnTheLastIndexOfStr(message));
Mail newMail={senderAdress,getterAdress,subject,date,encryted};
char s[250];
//strcpy(s,newMail.message);
printf("%s",&newMail->message);
Kaan
mail part: typedef struct Mail{
char senderAdress[40];
char recieverAdress[40];
char subject[20];
char date[11];
char message[250];
}Mail;
z
char senderAdress[40];
printf("Enter your user mail adress:");
fflush(stdout);
scanf("%s",senderAdress);
char getterAdress[40];
printf("Enter the getter adress");
fflush(stdout);
scanf("%s",getterAdress);
char date[11];
printf("Enter the date:");
fflush(stdout);
scanf("%s",date);
char subject[20];
printf("Enter the subject:");
fflush(stdout);
scanf("%s",subject);
char message[250];
printf("Enter the message:");
fflush(stdout);
scanf("%s",message);
char encryted[250];
encryptTheMesage(encryted,message,returnTheLastIndexOfStr(message));
Mail newMail={senderAdress,getterAdress,subject,date,encryted};
char s[250];
//strcpy(s,newMail.message);
printf("%s",&newMail->message);
You can't assign array of chars in this way.
Also your encrypted message may contain arbitrary bytes and may not be C null terminated string anymore.
So you have to use memcpy for that.
For other members that are still in C string format, you can use strcpy.
Kaan
I will try
z
You may also need additional variable to store the length of your encrypted message. Arbitrary bytes must be handled in different way with C null terminated string.
z
You may need something like this.
[Struct definition]
typedef struct Mail{
char senderAddress[40];
char receiverAddress[40];
char subject[20];
char date[11];
char message[250];
size_t msgLen;
} Mail;
[Initialization]
Mail newMail;
strncpy(newMail.senderAddress, inputSenderAddress, 40);
strncpy(newMail.receiverAddress, inputReceiverAddress, 40);
strncpy(newMail.subject, inputSubject, 20);
strncpy(newMail.date, inputDate, 11);
memcpy(newMail.message, encryptedMessage, encryptedMessageLength);
newMail.msgLen = encryptedMessageLength;
// use newMail here
Kaan
You may also need additional variable to store the length of your encrypted message. Arbitrary bytes must be handled in different way with C null terminated string.
Thank you very much. I have changed my code and now it is working.
Thierry
is C99 row or column major?
Thierry
is the memory layout used by C99 row major or column major
i.e. multi-dimensional arrays
Anonymous
There's no multidimensional arrays
These are arrays of arrays
Thierry
exactely what i mean
Anonymous
I don't understand what you mean
Anonymous
If you picture arrays of arrays, you'll get answer to your question
Rushi
Can any one explain this recursive by babysteps I have wasted whole day but cannot understand
If m1 is greater than m2, then median is present in one of the below two subarrays.
a) From first element of ar1 to m1 (ar1[0...|_n/2_|])
b) From m2 to last element of ar2 (ar2[|_n/2_|...n-1])
Rushi
Here is the code
if (m1 < m2)
    {
        if (n % 2 == 0)
            return getMedian(ar1 + n/2 - 1, ar2, n - n/2 +1);
        return getMedian(ar1 + n/2, ar2, n - n/2);
    }
Rushi
Here is problem approach by 2 method
https://www.geeksforgeeks.org/median-of-two-sorted-arrays/amp/
Rushi
If any one can explain I have wasted whole day to understand
CΞMİL
hi
CΞMİL
MY FRİENDS
Rushi
Hi
CΞMİL
I'm newer too
Rushi
Hi
Rushi
C++
Rushi
I I'm doing in c++
Can you explain
Rushi
Hello gc
Anonymous
That was me
Jaaa
Martin
Hi all. Is it the correct behavior for this snippet to print "step 3" only?
c++
auto example() -> return_ignore {
std::cout << "step1" << std::endl;
co_await std::experimental::suspend_always{};
std::cout << "step 2" << std::endl;
}
int main() {
example();
std::cout << "step 3" << std::endl;
}
Martin
(Code yanked from https://luncliff.github.io/coroutine/ppt/[Eng]ExploringTheCppCoroutine.pdf)
Is said it should print "step 1" and "step 3".(Page 32)
Anonymous
Hii, how can i count the words in a string in c?
Aakash
(Code yanked from https://luncliff.github.io/coroutine/ppt/[Eng]ExploringTheCppCoroutine.pdf)
Is said it should print "step 1" and "step 3".(Page 32)
Behavior is correct🙃
Should print 1 & 3; returns from suspend_always!
Martin
Behavior is correct🙃
Should print 1 & 3; returns from suspend_always!
Thanks. Do you know what I may be doing wrong? Or is this is a compiler/libc++ bug?
Martin
I only got 3 when compiled from GCC 10.2
Aakash
Thanks. Do you know what I may be doing wrong? Or is this is a compiler/libc++ bug?
Maybe something with gcc!
You may check here with clang.
I’ve added cout to check with flow! It’s correctly working aka returning at Suspend.
https://wandbox.org/permlink/LmgsDMkWeHokl5rC
Martin
Thanks a lot! I'll look into it and maybe file an bug report.
IAmMADMAX
1 2 4 7
3 5 8 11
6 9 12 14
10 13 15 16
Monem
Int n = rand() % 2;
If (n==0)
{
Do this
}
This will do the task 50% of the time.
How to make it 30% of the time or 70% ? Thank you 🙏🏼
Martin
Monem
C
Aakash
Thanks a lot! I'll look into it and maybe file an bug report.
Check with build version status if your gcc was compiled with coroutines support. If so, compile with -fcoroutines to identify the attachment to program.
Thereafter you may seek bug based upon your debug & output.
Anonymous
Greetings my fellow programmers
PLAUNIT
/*WAP to generate a magic square*/
# include <stdio.h>
# include <conio.h>
int main()
{
int n, i, j, c, a[9][9] ;
printf("Enter the size of the magic square : ") ;
scanf("%d", &n) ;
if (n % 2 == 0)
{
printf("\nMagic square is not possible") ;
goto end ;
}
printf("\nThe magic square for %d x %d is :\n\n", n, n) ;
j = (n + 1) / 2 ;
i = 1 ;
for(c = 1 ; c <= n * n ; c++)
{
a[i][j] = c ;
if(c % n == 0)
{
i = (i + 1);
goto loop ;
}
if(i == 1)
i = n ;
else
i = i - 1 ;
if(j == n)
j = 1;
else
j = j + 1 ;
loop : ;
}
for (i = 1 ; i <= n ; i++)
{
for (j = 1 ; j <= n ; j++)
{
printf("%d\t", a[i][j]) ;
}
printf("\n\n") ;
}
end : ;
getch() ;
return 0;
}
Anonymous
Guys Does anyone know why screen1 prints an extra char when executed?
Anonymous
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void reverse(char*, char*);
int main(void)
{
char str[15] = "Hello World";
char str2[strlen(str)];
reverse(str, str2);
printf("original str: %s\nreversed str: %s\n", str, str2);
return 0;
}
void reverse(char *str, char *str2)
{
char *ptr = &str[strlen(str)-1];
for(int i = 0; ptr >= str; i++, ptr--)
{
str2[i] = *ptr;
}
}
Anonymous
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void reverse(char*, char*);
int main(void)
{
char str[15] = "Hello World";
char *str2 = malloc(sizeof(str));
reverse(str, str2);
printf("original str: %s\nreversed str: %s\n", str, str2);
return 0;
}
void reverse(char *str, char *str2)
{
char *ptr = &str[strlen(str)-1];
for(int i = 0; ptr >= str; i++, ptr--)
{
str2[i] = *ptr;
}
}
Anonymous
the last code doesn't print the extra char idk why :S
Anonymous
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void reverse(char*, char*);
int main(void)
{
char str[15] = "Hello World";
char *str2 = malloc(sizeof(str));
reverse(str, str2);
printf("original str: %s\nreversed str: %s\n", str, str2);
return 0;
}
void reverse(char *str, char *str2)
{
char *ptr = &str[strlen(str)-1];
for(int i = 0; ptr >= str; i++, ptr--)
{
str2[i] = *ptr;
}
}
Use a malloc size of strlen(input) + 1, consider using strcpy() and reversing the copied string in place.
Anonymous
But why the version without malloc prints an extra char?