How to find my age in c

How to find my age in c

Write a C program to enter id, name and address of 25 employees into structure variable called employee and sort them in ascending order on the basis of their name with use of pointer.

give me some suggestion i an confused with the question

Am new to programming ..buh i prefer learning c language first...any guide or advice?

Advice: go with something easier than C, for example: python, that's how I started

ooh ohk...But C provides the basics... Thats what i have read

Am new to programming ..buh i prefer learning c language first...any guide or advice?

hey guys , can anybody give me a example how to pause and resume data in tcp ? icreate a simple real chat api ,I want to allow the user to stop ,pause and resume the file when uploading or download

#include <iostream> #include <stdio.h> using namespace std; class student { int rno; char name [20]; int s1, s2, s3, tot; float percent; public: void getdata (void); void display (void); void calc (void); }; void student::getdata (void) { cout << "enter roll no"; cin>>rno; cout<<"enter name"; cin>>name; cout<<"enter marks"; cin>>s1>>s2>>s3; } void student:: calc(void) { tot=s1+s2+s3; percent=tot/3; } void student::display (void) { cout<<"\n roll no "<<rno; cout<<"\n name "<<name; cout<<"\n marks "<<s1<<" "<<s2<<" "<<s3; cout<<"\n total "<<tot; cout<<"\n percent "<<percent; } void main() { student s[5]; int i; for (i=0; i<3;i++) { s[i].getdata(); s[i].calc(); s[i].display(); } return 0; }

Which one is this

how to resolve this?

Change void main() to int main() The compiler cant give you a more friendlier error message.

What's the issue with this: int dfs(int &grid[][5], int i, int j, bool &visited[]) error: declaration of 'grid' as array of references int dfs(int &grid[][5], int i, int j, bool &visited[]) {

What do you want the grid parameter to be? You have declared grid to be an array of arrays of int references. The grid parameter in your case is int& (*grid)[5]. You cant have an array of references or a pointer to it.

umm it's a variation of Flood Fill Algo that I am implementing I need to pass the 2D array as reference

If you want to pass it by reference then you have to use both the dimensions. Suppose the first dimension is also 5, then your function declaration should be int dfs(int (&grid)[5][5], int i, int j, bool (&visited)[5]) Change the dimensions of grid and visited as per your requirements.

yes i mean i can do vector<vector<int> > &matrix but again int (&grid)[5][5] and bool (&visited)[5]) didn't work out :/

Hello! I want to make an array of mutexes, so I did the following in the class: cpp private: std::array<std::shared_mutex, 14> locks_; The problem is the mutex die before I even start. libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument how do I make it live as long as the object lives?

Show us the code for the class where you store locks_ and how you use them.

I store it in an std::array

I am trying double x=1.0; double y=2.0; double z; z = x+ y; cout << z; It gives 3 not 3.0

Is it necessary to add std:: if I am using "using namespace std;" ?

int mergeSort(int arr[], int array_size) { int temp[array_size];👈👈👈👈 return _mergeSort (arr, temp, 0, array_size - 1); }

Error: expression must have constant value

What should I do

Normal array

The dimensions of normal arrays must be a integral constant expression. You cant use a variable that is not a constexpr. VLA is not supported in C++.

What if I make the func take constant parameter

Still wont work.

What is a constant expression..

A value that is known at compile time.

A value that is known at compile time.

Will it work if array_size Is evaluated before creating this array..? (Then it is know in compile time??)

int main() int arr[] = { 1, 20, 6, 4, 5 }; int n = sizeof(arr) / sizeof(arr[0]);👈👈👈 int ans = mergeSort(arr, n); cout << ".Number of inversions are " << ans; return 0; }

Hey..I desires to learn c and c++ concepts..so I have joined this platform..I hope this platform will help me in defining and understanding the programming concepts in every aspect

Sure, when you have doubt, feel free to ask

Thanks..Actually I'm new to this beautiful computer science platform. So I am in need to learn all the Java concepts readily from the beginning.

Hi! Is there any specific criterion to define a member function of a class as an inline function? Or only if a function definition is short?

Here n is a plain int variable that is still considered to not be a compile time constant. Make it constexpr int n = sizeof(arr)/sizeof(arr[0]). Then you can use n to create arrays of length n. But this still wont work out if you intend to pass n as an argument to another function

Hey..I created a dynamic array like u said (Int*)malloc(sizeof(int)*array_size);

Why are we casting it into( int*) Why not int

Because it is a region of array_size integers allocated on the heap and the return value of malloc is a pointer to the first int in this region returned as a void* pointer. In C, you should not cast the return value from malloc. But C++ requires such a cast from void* to int*. But in C++, you should not use malloc at all. You should be using smart pointers instead to manage memory or you can use new/delete directly if for some reason you cant use smart pointers.

There is no specific criterion. If a member function is defined inside the class body it is implicitly inline. But note that the meaning of the keyword "inline" has been changed since the C++17 standard. Previously inline used to be an indicator to the compiler to possibly inline calls to the function at the call site itself rather than going through the time consuming procedure call option. This was just a hint and the compiler could ignore this inline directive. But since C++17, the meaning of the keyword inline has been changed so as to match ODR rules (One Definition Rules) i.e. to not violate them. The new definition allows more than one definition of inline function across translation units and to ensure all such accesses point to the same address. You can read about it here. inline keyword can now be used with variables as well.

Ok.! I referred particularly to the implicit inline when a member function is defined inside the body class. My intention behind the question is: in my code, I noticed that getters(accessors) are short. So, is that a good practice defining all of them as an inline function (implicitly)?