Curve.h: class Curve { ... CurveType m_type = CurveType::GRAPH; std::vector<Point> m_points = {}; ... Curve.cpp: ... m_type = curveType; m_points = points; ... why am i getting a "variable Curve::m_type" is uninitialized warning (visual studio)?

Sorry, does anyone think using Android CPP compiler can be reliable. I'm learning CPP(ebook: beginner's guide in understanding the principles of programing in C++ by Byarne Stroustrup) without a laptop, so I use my phone, but now I'm stuck on the "vector" program.

Sorry, does anyone think using Android CPP compiler can be reliable. I'm learning CPP(ebook: beginner's guide in understanding the principles of programing in C++ by Byarne Stroustrup) without a laptop, so I use my phone, but now I'm stuck on the "vector" program.

in beginning... i use android cpp compiler app... it's like computer...

in beginning... i use android cpp compiler app... it's like computer...

#include<stdio.h> #include<math.h> int distance(int x1,int y1,int x2,int y2); int point_inside_triangle(); int area_of_triangle(int x1,int y1,int x2,int y2,int x3,int y3); int main() { int x1,y1,x2,y2,x3,y3,x,y,area; printf("enter the x and y co ordinates of vertex 1: \n"); scanf("%d%d",&x1,&y1); printf("enter the x and y co ordinates of vertex 2: \n"); scanf("%d%d",&x2,&y2); printf("enter the x and y co ordinates of vertex 3: \n"); scanf("%d%d",&x3,&y3); area_of_triangle(x1,y1,x2,y2,x3,y3); printf("area of triangle is:%d\n",area); printf("enter the points x,y to check whether they lies inside triangle or not:\n"); scanf("%d%d",&x,&y); point_inside_triangle(x,y); if(area_of_triangle(x1,y1,x2,y2,x3,y3)==1) printf("point lies inside triangle\n"); else printf("point lies outside triangle\n"); return 0; } int distance(int x1,int y1,int x2,int y2) { int dist; dist=sqrt(pow((x2-x1),2)+pow((y2-y1),2)); return (dist); } int area_of_triangle(int x1,int y1,int x2,int y2,int x3,int y3) { int S1,S2,S3,S,area; S1=distance(x1,y1,x2,y2); S2=distance(x1,y1,x3,y3); S3=distance(x2,y2,x3,y3); S=(S1+S2+S3)/2; area=sqrt(S*(S-S1)*(S-S2)*(S-S3)); return (area); } int point_inside_triangle(int x,int y,int x1, int y1, int x2, int y2, int x3, int y3,int area) { int A1,A2,A3,A; A1=area_of_triangle(x1,y1,x2,y2,x,y); A2=area_of_triangle(x1,y1,x3,y3,x,y); A3=area_of_triangle(x3,y3,x2,y2,x,y ); A=A1+A2+A3; if(A==area) return 1; else return 0; } can anyone tell me what is the mistake in this code please??

Passing values to point_inside_triangle function In line 20

Hey everyone. I was wondering if the linker command failed with exit code 1, undefined symbols has sth to do with having a class template. Can't I have template class and choose a particular data type from another class in a separate header file? Please help me out.

Can you show us what exactly you are trying to do through an MCVE? As long as the template class is fully visible at the point of instantiation and the template argument alsosatisfies the requirements of the template parameter it should not be an issue

Can you show us what exactly you are trying to do through an MCVE? As long as the template class is fully visible at the point of instantiation and the template argument alsosatisfies the requirements of the template parameter it should not be an issue

I have a linked list class in a header file called linklist.h which is a template for having admins, members data types that are in separate header files. When I try to load data from a file to admin type of linkedlist, it says no matching constructor for initialization of Admin.

It is not possible to help you this way. We don't have magic crystal balls to predict what your code would be from just a few sentences in English. Good luck trying to get help from somwhere else

#include<stdio.h> #include <string.h> struct student{ int rollno; char name[10]; }; int main(){ int i; struct student st[5]; printf("Enter Records of 5 students"); for(i=0;i<5;i++){ printf("\nEnter Rollno:"); scanf("%d",&st[i].rollno); printf("\nEnter Name:"); scanf("%s",&st[i].name); } printf("\nStudent Information List:"); for(i=0;i<5;i++){ printf("\nRollno:%d, Name:%s",st[i].rollno,st[i].name); } return 0; }

If you want an easier journey to all that stuff, you can read "Effective C++", "More Effective C++" and "Modern Effective C++" from Scott Meyers, they cover a lot of common mistakes and common knowledge things about C++. It's a bit more advanced reading, so you may want to skip some paragraphs when reading to return to them later

"format '%c' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]", any idea ???

can you share more code? MSVC shows no warnings for this #include <vector> #include <utility> using Point = std::pair<double, double>; enum class CurveType { GRAPH }; class Curve { std::vector<Point> m_points = {}; CurveType m_type = CurveType::GRAPH; public: Curve(CurveType curveType, const std::vector<Point>& Points) { m_type = curveType; m_points = Points; } }; int main() { Curve C { CurveType::GRAPH, {} }; return 0; } https://godbolt.org/z/zaxbWfjPx

I am unable to make this code work with ( and ) brackets in converting infix to postfix expression ,the program returns a garbage value when tried to do so. I tried all sorts of ways to make this program work but failed so trying to find the solution . https://pastebin.com/FWBxYUNF

can anyone help me here ,its very urgent.

In c++ strings program to print the longest word , how do I correct the runtime error saying terminator called after throwing an instance of ' std:: out_of_range' ?? The program gets terminated whithout showing the expected output even though code is correct

hi! the compiler implicitly defines 6 operations(default ctor, copy/move ctor, copy/move assignment, dtor). how can i know when it defines these operations or not? for example, if i define my copy ctor, the compiler still define the rest of these operations?

Look at this message and the image shared above it: https://t.me/programminginc/414045

out_of_range is an exception class derived from logic_error. If that exception is thrown it certainly means that there is a programming error in your code that can be fixed.

Sorry guys! Someone to help me with this one,,,,, #include<iostream> #include<fstream> #include<cstring> using namespace std; int loggedin() { string password,username,pass,us; cout<<"enter password :\n"; cin>>password; cout<<"enter username :\n"; cin>>username; ifstream read; read.open("database.txt"); if(read.fail()); getline(read,us); getline(read,pass); read.close(); if(us==username && pass==password) { return 1; } else { return 0; } } int main () { int choice; cout<<"1 register :\n"; cout<<"2 loggin :\n"; cout<<"3 exit :\n"; cout<<"enter your choice :\n"; cin>>choice; if(choice==1) { string us,pass; cout<<"enter username :\n"; cin>>us; cout<<"enter password :\n"; cin>>pass; ofstream file; file.open("database.txt"); file<<us; cout<<endl; file<<pass; file.close(); main(); } else if(choice==2) { bool m= loggedin(); if(m!=1) { cout<<"wrong input\n"; main(); return 0; } else { cout<<"loggin successfully\n"; main(); return 1; } } } Even when the username and password are correct the program keeps saying "wrong input"

@K11M1 @gameraccoon @SilhouetteInDark @ollirz @chandradeepdey or anyone else. Please answer

insert into priority queue can be even constant... depends on the implementation, and i don't know the STL implementation

Not sure what you mean where, they used writing modern C++ code. I mean not every app uses all of these (e.g. smart pointers in embedded software or with other places where "orthodox C++" used), but they are kind of essential parts of modern C++ and it usually helpful to know what they are at least and why they are exist.

depends on when you learnt. if before 2015, then there is a high chance that you would pick those up later. but if you learn with modern* books such as C++ Primer by Lippman or Stroustrup's book, you will learn them the first time. *modern is now a stretch for even those books though. lippman's book covers C++11, and Stroustrup's one covers C++14. hopefully newer editions of the books are coming soon.

If I am inserting n no. Of elements in a priority_queue (STL) then what will be the complexity of this.

If I am inserting n no. Of elements in a priority_queue (STL) then what will be the complexity of this.

if i were you i would test what string i am getting from an input, i would look for newline character at the end

@K11M1 @gameraccoon @SilhouetteInDark @ollirz @chandradeepdey or anyone else. Please answer

Can you people tell about this as well

That naming is always confusing (surprisingly authors of technical books do that), some time soon "Modern C++" will be pretty old book I mean "modern C++" as post C++11

the function is just inserting at the end of the std::vector and then shuffling the elements (heapifying)

Why bro

? that's how the standard defines it

Means

:/

? that's how the standard defines it

https://en.cppreference.com/w/cpp/container/priority_queue/push#Complexity

I know this. I'm using vector as the container and the elements inserted are integers. Actually I want to know if I insert n integers then will it be O(n)

Pushing 1 element happens in O(logN) time but as numbers are added into the heap the N(no of elements in heap) will also increase. So it can't be O(nlogn)

Pushing 1 element happens in O(logN) time but as numbers are added into the heap the N(no of elements in heap) will also increase. So it can't be O(nlogn)

Because think we want to get the top 3 largest elements of n integers. Then one way is I sort all the n numbers in o(nlogn). And then extract 3 top elements. Other way is using heap for it. Then if heap is also doing it in O(nlogn) what's the use

also btw the exact problem you said is used as a disproof in an exercise in the CLRS book

if heaps insertion worked in O(n) time, then you would just pick the max element one by one and create a new sorted array in O(n) time

if heaps insertion worked in O(n) time, then you would just pick the max element one by one and create a new sorted array in O(n) time