how do i get dlopen(NULL, RTLD_LAZY); to work, as dlsym(symbol_table, name); returns 0x0 even though the symbol exists i am using android ndk

even this fails dlsym(dlopen(NULL, RTLD_LAZY), name); and dlerror reports undefined symbol: newInstance__imgui even though i use extern "C" attribute ((visibility("default")))

i have 5200: 000000000020dd00 152 FUNC GLOBAL DEFAULT 14 newInstance__imgui

Please can someone explain the logic of this code to me? //convert a string to integer //ex. String “ryutfg477” //returns 477 int main(char *s) { unsigned int num = 0; s = “good89” while (*s++) { if (*s >= ‘0’ && *s <= ‘9’) num=(num*10) + (*s-‘0’); else if(num > 0) break; } return (num); }

it iterates over a pointer to char and performs an operation on each character pointed to.

Sir i have a doubt

Write a program to generate even number between given range

Write a program to generate even number between given range

What's the doubt

I didnt write this program

Please complete my program

Try it, We are not here to write your programs. We will help you when you get stuck at certain point.

Have anybody ever wrote own .mdb files reader/writer?

Hello I, m elaf I study IT I wanaa some channels in YouTube to learn c++ language plz help me I have exam with in week

Hello I, m elaf I study IT I wanaa some channels in YouTube to learn c++ language plz help me I have exam with in week

The Cherno, CppNuts, ChilliTomatoNoodle, Nesco Academy, CppCon

Hello I, m elaf I study IT I wanaa some channels in YouTube to learn c++ language plz help me I have exam with in week

And, you won't learn C++ within a week)

Hello I, m elaf I study IT I wanaa some channels in YouTube to learn c++ language plz help me I have exam with in week

/get cppbookguide

The best way to pick up C++ is via a book because the language has a lot of quirks you need to know

try hackerrank, it is newbie friendly

Thank a lot !!!

#include <stdio.h> int main() { char a; int r; do { printf("Enter a number:"); scanf("%d",&r); printf("Do u need to do again(y/n)?"); scanf("%c",&a); }while (a=='y'); } For some reason this do not do what i need to do. Then u might be asked me that what i need to do. I believe u can understand what i need to do. However, if anyone hear to tell me what wrong with here, pls tell me quickly. Because it chop my brain.

#include <stdio.h> int main() { char a; int r; do { printf("Enter a number:"); scanf("%d",&r); printf("Do u need to do again(y/n)?"); scanf("%c",&a); }while (a=='y'); } For some reason this do not do what i need to do. Then u might be asked me that what i need to do. I believe u can understand what i need to do. However, if anyone hear to tell me what wrong with here, pls tell me quickly. Because it chop my brain.

Scanf is not a good function afaik use fgets

Scanf is not a good function afaik use fgets

i am just a begginer to C. So i haven't meet fgets yet🙂

Scanf is not a good function afaik use fgets

Can u explain what is the reason for that

Scanf is not a good function afaik use fgets

In theory, i think my code has no errors.

Can i ask question bcs i dont understand this sbjct😢

Can anyone send the best link to learn about lists in c++

Change scanf("%c",&d) to scanf(" %c", &d)

@ElliotWebEater Read this message and my message following that

Is the any difference if I pass the size of an array to a function vs when I calculate the size of the array inside the function

Is the any difference if I pass the size of an array to a function vs when I calculate the size of the array inside the function

If it is a built in array, you cant calculate the size inside the function unless you pass the array by reference.

If it is a built in array, you cant calculate the size inside the function unless you pass the array by reference.

Built in means created in main??

Built in means created in main??

Built in array means array created like this "int arr[10]" though technically there is nothing like built in array in the standard. It applies more to languages like GoLang

Built in array means array created like this "int arr[10]" though technically there is nothing like built in array in the standard. It applies more to languages like GoLang

Ok

#include <bits/stdc++.h> using namespace std; // } Driver Code En vector<int> duplicates(int arr[], int n) { // code here vector<int> p; vector<int> q; map<int,int> m; for(int i = 0;i<n;i++){ m[arr[i]]++; } bool dup = 0; for(auto i : m){ if(i.second > 1){ p.push_back(i.first); dup = 1;} } if(dup == 1) return p; else q.push_back(-1); return q; } // { Driver Code Starts. int main() { int t; cin >> t; while (t-- > 0) { int n; cin >> n; int a[n]; for (int i = 0; i < n; i++) cin >> a[i]; vector<int> ans = duplicates(a, n); for (int i : ans) cout << i << ' '; // cout << endl; } return 0; } // } Driver Code Ends

why it showing tle my time comple. is O(n) ??

Write c program to find our stange pair numbers in between 1 to 200 which squares are mirror images of each other Ex.13 and 31 is a mirror image of each othet and their squares 169 and 961 are also a mirror image of each other

Can someone plzz provide me a solution

why it showing tle my time comple. is O(n) ??

O(t*n)

Can someone plzz provide me a solution

no

has anyone solved XORequal problem at codechef, got to clear something

hi

I need to Implement my own version my_queue, it should have exactly the same signature and functions as that of Queue class in STL. For this first, i need to declare a 'C++ Interface' that defines the interface for Queue class, then define a my_queue class that implements this Interface. Can anyone help how to proceed about it ?

in for loop of i, how can I access the count of any number in a map?

in for loop of i, how can I access the count of any number in a map?

Count of keys?

yes, like lets say we enter 4 times 1, 3 times 2 and 6 times 3 so in a for loop I want to access the count of these numbers(1, 2, 3)

yes, like lets say we enter 4 times 1, 3 times 2 and 6 times 3 so in a for loop I want to access the count of these numbers(1, 2, 3)

So you have some values and you want to add them to map with their frequencies.

like arr = [1, 1, 1, 2, 2, 2, 2] map = {1:3, 2:4}

yes and now I want to print 3 and 4 using for loop

Ok

I tried this: umap[i].second didn't worked

I tried this: umap[i].second didn't worked

Ok, let me code.

okay

though we can access them like this: for(auto pr:umap) { cout<<pr.first<<" "<<pr.second<<endl; } but I need access them using for loop of i

though we can access them like this: for(auto pr:umap) { cout<<pr.first<<" "<<pr.second<<endl; } but I need access them using for loop of i

Use mp[i], it will give the value of key i

let me try

though we can access them like this: for(auto pr:umap) { cout<<pr.first<<" "<<pr.second<<endl; } but I need access them using for loop of i

I think this is the only way to print keys and values using loop.

As per of my knowledge, you can't access map's key value using index.

And, you won't learn C++ within a week)

I can 👍💛

Thx

i am just a begginer to C. So i haven't meet fgets yet🙂

I’m new too, I think because it has security vulnerabilities

I can 👍💛

You might be able to learn the syntax within 1/2 weeks but not the language

C/C++ have the best syntax it’s easy and concise

The best way to learn is via a book because they cover it in depth

I tried this: umap[i].second didn't worked

umap[i] IS the value, it's not a pair

umap[i] IS the value, it's not a pair

so anyhow can we access the key part using for loop? and if do something like that for(auto pr:umap) { cout<<pr.first<<" "<<pr.second<<endl; } we can access them as pairs!!!!

so anyhow can we access the key part using for loop? and if do something like that for(auto pr:umap) { cout<<pr.first<<" "<<pr.second<<endl; } we can access them as pairs!!!!

i is the key

here by key, I mean the number of occurrence of any particular integer

i is the key

like if 1 goes 5 times and 2 goes 3 times then total iterations =8 but key for 1 is 5 and key for 2 is 3

like if 1 goes 5 times and 2 goes 3 times then total iterations =8 but key for 1 is 5 and key for 2 is 3

can you write out the map

#include<iostream> #include<bits/stdc++.h> using namespace std; void repalcex(char c[], char a, char b, int i = 0){ if(c[i] == '\0'){ return ; } if(c[i] == a){ c[i] = b; } repalcex(c, a, b, i+1); } int main(){ char ch[] = "hexxo"; repalcex(ch, 'x', 'l'); for(int i = 0; i != '\0'; i++){ cout<<ch[i]; } }

#include<iostream> #include<bits/stdc++.h> using namespace std; void repalcex(char c[], char a, char b, int i = 0){ if(c[i] == '\0'){ return ; } if(c[i] == a){ c[i] = b; } repalcex(c, a, b, i+1); } int main(){ char ch[] = "hexxo"; repalcex(ch, 'x', 'l'); for(int i = 0; i != '\0'; i++){ cout<<ch[i]; } }

Why this code is not showing output

Why this code is not showing output

for(int i = 0; i != '\0'; i++)

'\0' is just 0

Hi, what's the best way to embed python module or at least some code into c++ code? Unfortunately the python codebase is simply too big and rewriting it would be an overkill.

Hi, what's the best way to embed python module or at least some code into c++ code? Unfortunately the python codebase is simply too big and rewriting it would be an overkill.

You can use C in python I believe

You can use C in python I believe

but i want to write app in cpp and make use of some API written fully as a python module

for(int i = 0; i != '\0'; i++)

Then how can I solve it

Then how can I solve it

solve what?

but i want to write app in cpp and make use of some API written fully as a python module

You can’t do C++ in python unfortunately

To print string

But you can make them interact with each other probably

you are basically writing for (int i = 0; i != 0; ++i)

But they can’t be in the same .py file