How ? Can you tell me the syntax?

You didn't specify template argument while calling

Sachin Bhandari: #include<bits/stdc++.h> using namespace std; template<class T> class graph{ map<T,list<T> > adjlist; public: void insert(T v,T u,bool bidir=true){ adjlist[v].push_back(u); if(bidir) adjlist[u].push_back(v); } void print(){ for(auto node:adjlist) { cout<<node<<"->"; for(auto neighbour:adjlist[node]) cout<<neighbour; cout<<endl; } } }; int main(){ graph <string,int> g; g.insert("Alc","Blc"); g.insert(1,"Blc"); g.insert("Alc",43); g.insert("Almora","Bunic"); g.insert(43,"hello"); g.insert("Almora","Blc"); g.insert("Almora","hello"); return 0; } I want to make nodes of integer and string type so i created a templated class ,but now how to create object of such type?? #help please

Sachin Bhandari: #include<bits/stdc++.h> using namespace std; template<class T> class graph{ map<T,list<T> > adjlist; public: void insert(T v,T u,bool bidir=true){ adjlist[v].push_back(u); if(bidir) adjlist[u].push_back(v); } void print(){ for(auto node:adjlist) { cout<<node<<"->"; for(auto neighbour:adjlist[node]) cout<<neighbour; cout<<endl; } } }; int main(){ graph <string,int> g; g.insert("Alc","Blc"); g.insert(1,"Blc"); g.insert("Alc",43); g.insert("Almora","Bunic"); g.insert(43,"hello"); g.insert("Almora","Blc"); g.insert("Almora","hello"); return 0; } I want to make nodes of integer and string type so i created a templated class ,but now how to create object of such type?? #help please

And don't use <bits/stdc++.h> header

And don't use <bits/stdc++.h> header

Why?

Bol na q

Hi

#include <bits/stdc++.h> #include<iostream> #include<stack> #include<string> #include<cmath> using namespace std; #define max 100 int postfixevaluate(string str); bool isdigit(char str); bool isoperator(char str); int operation(char operators , int operand1, int operand2); class Stack{ // int top; public: int arr[max]; int top; Stack(){ top=-1; } bool push(int x); int pop(); }; bool Stack:: push(int x){ if(top>=(max-1)){ cout<<"overflow"; return false; } else{ arr[++top]=x; return true; } } int Stack::pop(){ if (top<0){ cout<<"underflow"; return 0; } else{ char x=arr[top]; cout<<arr[top]; top--; return x; } } int main(int argc, char *argv[]){ string expression; cout<<"enter postfix expression"; getline(cin,expression); cout<<"the result is"<<postfixevaluate(expression); cout<<expression; return 0; } int postfixevaluate(string str){ stack<int> S; for(int i=0;i<str.length();i++){ cout<<"hello"; if(str[i]==' '||str[i]=='.') continue; //cout<<str[i]; /*else if(str[i]=="{"|| str[i]=="(" ||str[i]=="[" ) S.push(str[i]); else if(str[i]=="}"|| str[i]==")" ||str[i]=="]"){ if(str[i]=="}") while(top!="{") S.pop(); else if(str[i]==")") while(top!="(") S.pop(); else while(top!="]") S.pop(); }*/ else if(isoperator(str[i])){ cout<<"hello1"; int operand1= S.top(); S.pop(); cout<<"hello2"; int operand2= S.top(); S.pop(); cout<<"hello3"; int ans = operation(str[i], operand1, operand2); S.push(ans); cout<<"hello4"; } else if(isdigit(str[i])){ cout<<"hello5"; int operand=0; while(i<str.length()&& isdigit(str[i])){ operand=(operand*10)+ (str[i]-'0'); cout<<"hello6"; i++; } i--; cout<<"hello7"; S.push(operand); cout<<"hello8"; } } cout<<"hello9"; return S.top(); //return 0; } bool isdigit(char str){ if(str>=0 && str<=9) return true; else return false; cout<<"hello10"; } bool isoperator(char str){ if(str=='+'||str=='-'||str=='*'||str=='^'||str=='/') return true; else return false; cout<<"hello11"; } int operation(char operators, int operand1, int operand2){ int ans=0; if(operators ='+') ans = operand1 + operand2; else if(operators =='-') ans = operand1 - operand2; else if(operators =='*') ans = operand1 * operand2; else if(operators =='^') ans = pow(operand1,operand2); else if(operators =='/') ans = operand1/operand2; cout<<"hello12"; return ans; } I am trying to evaluate the postfix expression using C++ program, but this code is showing segmentation fault error, can anyone help me where is the error, it will be more helpful.

Bro use pastebin

How to use that pastebin?😅

#include <bits/stdc++.h> #include<iostream> #include<stack> #include<string> #include<cmath> using namespace std; #define max 100 int postfixevaluate(string str); bool isdigit(char str); bool isoperator(char str); int operation(char operators , int operand1, int operand2); class Stack{ // int top; public: int arr[max]; int top; Stack(){ top=-1; } bool push(int x); int pop(); }; bool Stack:: push(int x){ if(top>=(max-1)){ cout<<"overflow"; return false; } else{ arr[++top]=x; return true; } } int Stack::pop(){ if (top<0){ cout<<"underflow"; return 0; } else{ char x=arr[top]; cout<<arr[top]; top--; return x; } } int main(int argc, char *argv[]){ string expression; cout<<"enter postfix expression"; getline(cin,expression); cout<<"the result is"<<postfixevaluate(expression); cout<<expression; return 0; } int postfixevaluate(string str){ stack<int> S; for(int i=0;i<str.length();i++){ cout<<"hello"; if(str[i]==' '||str[i]=='.') continue; //cout<<str[i]; /*else if(str[i]=="{"|| str[i]=="(" ||str[i]=="[" ) S.push(str[i]); else if(str[i]=="}"|| str[i]==")" ||str[i]=="]"){ if(str[i]=="}") while(top!="{") S.pop(); else if(str[i]==")") while(top!="(") S.pop(); else while(top!="]") S.pop(); }*/ else if(isoperator(str[i])){ cout<<"hello1"; int operand1= S.top(); S.pop(); cout<<"hello2"; int operand2= S.top(); S.pop(); cout<<"hello3"; int ans = operation(str[i], operand1, operand2); S.push(ans); cout<<"hello4"; } else if(isdigit(str[i])){ cout<<"hello5"; int operand=0; while(i<str.length()&& isdigit(str[i])){ operand=(operand*10)+ (str[i]-'0'); cout<<"hello6"; i++; } i--; cout<<"hello7"; S.push(operand); cout<<"hello8"; } } cout<<"hello9"; return S.top(); //return 0; } bool isdigit(char str){ if(str>=0 && str<=9) return true; else return false; cout<<"hello10"; } bool isoperator(char str){ if(str=='+'||str=='-'||str=='*'||str=='^'||str=='/') return true; else return false; cout<<"hello11"; } int operation(char operators, int operand1, int operand2){ int ans=0; if(operators ='+') ans = operand1 + operand2; else if(operators =='-') ans = operand1 - operand2; else if(operators =='*') ans = operand1 * operand2; else if(operators =='^') ans = pow(operand1,operand2); else if(operators =='/') ans = operand1/operand2; cout<<"hello12"; return ans; } I am trying to evaluate the postfix expression using C++ program, but this code is showing segmentation fault error, can anyone help me where is the error, it will be more helpful.

It's hard to read 10+ lines of code in tg

And there's a standard function for that I dunno why you need your own

Hey everybody! I'm currently learning cpp and plan to learn it to an intermediate level (generics and stl). Does anyone know how much time it will take to learn to develop desktop applications using qt and cpp?

In Indian Education System,In our college lab, they don't want to use the inbuilt functions, they want that we built it from scratch, otherwise they will fail us in practical😞

Where is the link, @vipul2097?!

http://tpcg.io/tlzrpQ

You've been told to use pastebin, but you used this...

Sorry, Sir I don't know how to use pastebin, wait i will first watch tutorial on pastebin then give you the link of that, will it be fine?😞

Sorry, Sir I don't know how to use pastebin, wait i will first watch tutorial on pastebin then give you the link of that, will it be fine?😞

Well.. using pastebin is REALLY easy Before eating food, you watch tutorial too?

3-5 years. First, don't develop GUI applications until you get to know the language itself. Second, C++ itself have no facilities to develop GUI desktop applications at all, so you will have to study OS API (written mostly in C) and use it, this is a separate task. Qt is a very good alternative, but then you will have to learn Qt which is another separate task, too.

You've been told to use pastebin, but you used this...

Thanks for your answer! If I learn os calls based gui, wouldn't it be limited to that particular os? Isn't it better to learn something cross platform like qt?

https://pastebin.com/fwKfaFvE

You managed it

Thanks for your answer! If I learn os calls based gui, wouldn't it be limited to that particular os? Isn't it better to learn something cross platform like qt?

Thanks for your answer! If I learn os calls based gui, wouldn't it be limited to that particular os? Isn't it better to learn something cross platform like qt?

Hello All...! Best book for C programming learning.

hi guys anyone online to help me with my answer

question: https://www.hackerrank.com/challenges/birthday-cake-candles/problem || answer: https://del.dog/cpluspluscode.cc

1. code is not working 2. https://del.dog/cpluspluscode.cc

1. code is not working 2. https://del.dog/cpluspluscode.cc

So if is not working, fix it Kinda obvious, I think

i cannot find the problem why its not functioning that way

i cannot find the problem why its not functioning that way

It's wrong. You have to make array of size n. Also you've applied wrong logic.

The question just wants to find the no. Of tallest candles.

The question just wants to find the no. Of tallest candles.

The question just wants to find the no. Of tallest candles.

There's a thing, called debugging

Also exist the Ghost in the Shell

can you provide better logic to the given problem it would be helpfull?

1. Make an array of size n. 2. Sort the array in descending order. 3. For loop till a[i] ==a[i+1] Print i+1

can you code it sorry for asking for too much

can you code it sorry for asking for too much

How are you going to learn if I code?

No, code it yourself

How are you going to learn if I code?

can you write?

can you write?

wouldn't it be limited to that particular os? Surely it will to learn something cross platform like qt -- it is always better but you are not always able to use cross-platform solutions

Now, in 2019, learn Qt for GUI, it is better. But first, learn C++ without GUI

No