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Beginners - May 2019 (Page 3)

I need to know a code about graphic.h pls tell me what to do tnx, Anddd my classmate said that i need a software or something to e able to use graphic.h i...

[17 replies] Last: ARgggggggggg i wishhhhhhhhhh i learnnnnnnnnnn lot of stuff btw thanks... (by CoolAvocado)

by hixtus

Union-Find Algorithm (Finding Cycle) Without Using Malloc

Hello! I've been advised that using malloc in a c++ program shouldn't be done. How can I convert this to a non-malloc code? Thank you! https://www.geeksfo...

[3 replies] Last: That code looks like plain C rather than C++. Step 1 is to understan... (by keskiverto)

by Qikee

How to read from file (const problem)

Hello. today I tried using std::map and std::isalnum and I ran into a problem where I do not know how to get text input from a file , tried using string but it ...

[2 replies] Last: Thank you very much ! (by Qikee)

by xueyangwu

Output of char

Why does std::cout automatically convert the char variable I defined into the corresponding int from ASCII table? For example, in the code below, variable test ...

[6 replies] Last: int(test) creates a temporary int, +test promotes a char variable,... (by deleted account xyzzy)

by lutein

Template class Matrix multiplication with operator overloading (Absolute Beginner)

After adding a matrix addition, now I am adding matrix multiplication. But It seems to be far difficult than addition. To sum up my question 1.How can I ...

[3 replies] Last: @keskiverto, coder777 Thank you for answering the question. my matrix... (by lutein)

by aligh

Error in STL Random Generator program

I'm trying out the random generation facilities of STL. The following code produces a histogram for a normal distribution for 30 rows over 200 tries. It works,...

[4 replies] Last: Thank you so much! (by aligh)

by mpg

Recursion problem with string (1,2)

Can you help me with these two problems with recursion? 1) I have a string : define the dimension 2) I have a string and a character: find the first position of...

[23 replies] Last: std::string is an object that stores text, most likely in an array of ... (by keskiverto)

by kenken

Recursion Help

I am trying to write a power function using recursion but having some issues. Any help would be greatly appreciated. #include <iostream> #include <cmat...

[4 replies] Last: #include <iostream> #include <cmath> double power( int base, int ex... (by JLBorges)

by sturk

Issue with scale function in class square

I've been trying to implement the void scale function in class square but still did not managed to get it. The scale function and radius function is required to...

[4 replies] Last: Playpro10, can you post the text of the assignment. It will help great... (by dhayden)

by broon

Can't seem to ever get the right movement function for 2048

Exactly as title says, can't seem to do it. Here is my code, if you want to try to help. I deleted my old movement function. Forgive me for my names. ...

[3 replies] Last: So... my deleted code wasn't entirely deleted for no reason. I had to ... (by broon)

by aligh

to reference or not to reference in function return type

I have the following class: class Person { public: Person(const string & name, int age): name{name}, age{age} {}; const string & getName() const...

[6 replies] Last: Yes, sure! Your explanation and the code snippet helped me think about... (by aligh)

by lutein

Question about Template class operator overloading (Absolute Beginner)

Here is my source code. It's a simple matrix class I want to implement + operator overloading for matrix addition. But this code is not work. I have no idea ...

[2 replies] Last: Thank you very much!, JLBorges. I will try to understand that code. Th... (by lutein)

by pnthoai123

add list using pointer

everything is fine, but when I add new node to list, the head and the tail both take that node and remove the old, why? #include <stdlib.h> #include <str...

[1 reply] : [quote=pnthoai123]everything is fine That's what the watchman on the ... (by lastchance)

by aligh

code compilation error using thread and mutex

I'm trying to learn the basics of threads, mutex and function objects. Here's my test code trying to output "Hello" and "World" by two different threads every s...

[2 replies] Last: Thank you @Repeater! Works perfectly. (by aligh)

by GSid

Bitwise operations

hi all i am having trouble with a problem which requires me to set a number to the bottom 4 bits and use the top four bits to count the number of iterations ...

[4 replies] Last: combined = (counter << 4) | tL.q; gotta pay attention. Good luck! (by Duthomhas)

by sparki

Compilation error

I am getting a compilation error which I can't resolve on my own. Don't really know what to change really. Been stuck on this. Need your expertise on this pleas...

[4 replies] Last: when you do `polygon ' you get a PointType `PointType' does not have a... (by ne555)

by doodoohead01

Valid Operations with Arrays

I'm on the part which shows valid operations with arrays, and this one is confusing me. What is the purpose of the nested bracket on the first part. What specif...

[10 replies] Last: Ah, the tutorial. http://www.cplusplus.com/doc/tutorial/arrays/#access... (by Duthomhas)

by danik550

For loop help

So this may be a very dumb question but I want to make that 650.0f go down by 490 everytime it loops. On first loop it being 650, second loop 160, third -330 an...

[5 replies] Last: Ah never mind, I just took the float value = 650.0; out of the loop s... (by zapshe)

by sparki

Class constructor compilation error

I am receiving a compilation error which I am quite vexed about at this point for my polygon constructor(Refer below). I would appreciate if anyone could help m...

[1 reply] : new Polygon::PointType ; This is an attempt to create an an array ... (by Repeater)

by sturk

C++ cannot call member function w/o object

Hi, I am getting a compilation error saying "cannot call member function ‘void Point::PointType(float, float)’ without object." I've tried adjusting the con...

[12 replies] Last: You still haven't explained what this code is trying to do. It's very... (by dhayden)

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