a point points to the adress of a variable but its not a memory adress but a pointer has also to a memory adress

bro i mean its a big differnce of that : *pointer and that &reference

anyways, if you try to convert a pointer to an int and that int back to a pointer, and in your machine the size of a pointer is smaller than the size of an int (which is mostly the case), you'll get a trimmed value, and that address will be undefined

That is the big disadvantage of c.Its not type safe

Cpp is not type safe out of the box. But you can achieve it with disciplined programming

Hey guys how to count how many times a number appears in a 2d array? I've tried some method but didn't worked

after struggling, tried to do a bubblee sort, but... https://gist.github.com/Kamuri-chan/9ac977ec90c11e5295c64f0154cd60ef

linear search every row/column(if elements are unsorted) - expensive binary search every row/column(if elements are sorted) - less expensive , but still expensive.

why ? #define MAXLIMIT 255 you could have also used, In line 46, int matrix[value_x][value_y];

;p

resolved creating one 1d array, sorted with bubble sorting and counted every element

wait, so you first took one row, sorted it using bubble sort, and then counted every element in that particular row?

No, put every element on a new array and sorted the new array

in cpp char arr[10]={'h','e','o'} where will be null character stored?

in which case null will be stored automatically inside char array?

It won't be

in cpp char arr[10]={'h','e','o'} where will be null character stored?

BTW, it is an exception. If you initialize a sized array partially, the rest will be initialized with zero. So basically int arr[3] = {1}; arr[1] and arr[2] will be zero.

Suppose if it is fully filled?

I have a folder named include for header files and a lib folder for libraries -proj/ include/ .... lib/ jagpdf-1.4.dll jagpdf-1.4.lib test/ tpdf.cpp but when i enter following command in proj folder,: g++ -I.\include\ -L.\lib\ -ljagpdf .\test\tpdf.cpp mingw says: """ cannot find -ljagpdf collect2.exe: error: ld returned 1 exit status """ it recognizes header files but not library files any idea? https://stackoverflow.com/questions/67210830/cannot-link-external-libraries-with-my-cpp-code

Then it is what it is filled. That is not the point anyway. I know exactly what @VoidStar0x0 talking about. He means string literal like "Hello World" ends with null char.

#include <iostream> #include <fstream> using namespace std; int n; //Globaal viriable used in forloops in the functions class Student1 { public: string name, fn; string sex; double grade; Student1() {} Student1(string n, string fn, string s, double g); void data(Student1 s); //used to display all student info void filter(Student1 s); //used to filter out female students and display friend ofstream &operator<<(ofstream &ofs, Student1 &s); friend ifstream &operator>>(ifstream &ifs, Student1 &s); }; int main() { Student1 s; Student1 *list[n]; cout << "Enter number of student " << endl; cin >> n; for (int i = 0; i < n; i++) { cout << "enter name of student number " << i + 1 << endl; cin >> s.name; cout << "enter father name of sudent number " << i + 1 << endl; cin >> s.fn; cout << "enter Sex of student number M/m" << i + 1 << endl; cin >> s.sex; cout << "enter Grade of student number " << i + 1 << endl; cin >> s.grade; list[i] = new Student1(s.name, s.fn, s.sex, s.grade); } ofstream ofs("regi.txt",ios::app); for (int i = 0; i < n; i++) { ofs << list[i]; } Student1 student_list; ifstream ifs("regi.txt"); cout << "student data " << endl; cout << "***** Name SEX GRADE****" << endl; for (int i = 0; i < n; i++) { ifs >> Student1 list; } int choose; cout<<1 << "enter 1 for to diplay all student data" << endl; cout<<2 << "enter 2 for to diplay female student data" << endl; cin >> choose; switch (choose) { case 1: s.data(s); break; case 2: s.filter(s); default: break; } } Student1::Student1(string n, string fn, string s, double g) { name = n; fn = fn; sex = s; grade = g; } void Student1::filter(Student1 s) { if (s.sex == "f" || s.sex == "F") { for (int i = 0; i < n; i++) { cout << "Name " << s.name << endl; cout << "Father Name " << s.fn << endl; cout << "Sex " << s.sex << endl; cout << "Grade " << s.grade << endl; cout << endl; } } }

this is my code and i can't compile it ......please help me

this is my code and i can't compile it ......please help me

Firstly you can't use "list" as object name

there is no implemented function with name "data"

g++ -I.\include\ -L.\lib\ .\test\tpdf.cpp .\lib\jagpdf-14.dll -o test.exe ?

Exit with code 5. I think that's how i should compile it but somehow the library has problems

ok thanks all😊😊

I dont recommend fn=fn

Is it recommended to use the goto label? if not what are the implications?

wtf

You little cow

probably labels are allowed in assembler code,but not exactly in the languages like c++

probably labels are allowed in assembler code,but not exactly in the languages like c++

ok thanks all😊😊

Question: what libraries do you use most?

I have questions e.g there is independent classes having their own linked list structures and there is a another class having a pointer to the node type Is there any way i can get the head of the first data structures need help

txns rose am seriously interested in c++, learning resources and materials would be appreciated

https://pastebin.com/w5SX3qNH