Call function again | Together C & C++ | Page 1

dawn arrow Oct 25, 2024, 4:17 PM

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How i can call function again inside another?
Exaple: cpp #include<cstdlib> #include<iostream> namespace huh { int func1(char ask) { cout << "Type something sigma here: "; cin >> ask; } int main() { if (ask = "sigma" or "Sigma") { cout << "Very sigma!" << endl; /*How do i call func1 again?*/ } } {

vapid mossBOT Oct 25, 2024, 4:17 PM

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When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

lilac ruin Oct 25, 2024, 4:19 PM

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What do you mean by "call again"? You don't call func1() at all

tepid hawk Oct 25, 2024, 4:19 PM

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huh::func1(//argument);

harsh basalt Oct 25, 2024, 4:20 PM

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u made ur function but never called it

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also it's an int function returning nothing

tepid hawk Oct 25, 2024, 4:20 PM

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The main function is also inside the namespace huh

harsh basalt Oct 25, 2024, 4:21 PM

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you only run the main function

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if you want the function to be called, you must call it in the main function

tepid hawk Oct 25, 2024, 4:23 PM

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You should read about functions and namespace from learncpp since there are a lot of issues tbh

dawn arrow Oct 25, 2024, 4:23 PM

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lilac ruin What do you mean by "call again"? You don't call `func1()` at all

i mean, i have

char ask;
cout << "Hello";
cin >> ask;
if (ask = "hi") {
  cout << "";
} else {
  cout << "no";
  /* and i need to call that cout << "Hello"; again */
}```

lilac ruin Oct 25, 2024, 4:24 PM

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You've still never called func1().

harsh basalt Oct 25, 2024, 4:25 PM

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#include<cstdlib>
#include<iostream>
namespace huh {
  int func1(char ask) {
    cout << "Type something sigma here: ";
    cin >> ask;
    return 0;
  }
  void func2() {
    cout << "Type something sigma here: ";
    cin >> ask;
  }
  int main() {
    if (ask = "sigma" or "Sigma") { 
      cout << "Very sigma!" << endl;
      /*How do i call func1 again?*/
      int res = func1('\0'); // res equals 0
      func2();
    }
  }
{

dawn arrow Oct 25, 2024, 4:26 PM

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how do i call functions then because my book doesn't say that or i didn't read abt it

harsh basalt Oct 25, 2024, 4:26 PM

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thats how

tepid hawk Oct 25, 2024, 4:26 PM

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dawn arrow how do i call functions then because my book doesn't say that or i didn't read ...

Which book?

dawn arrow Oct 25, 2024, 4:27 PM

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tepid hawk Which book?

its pretty old

tepid hawk Oct 25, 2024, 4:27 PM

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A book that doesn’t even explain how to call functions is pretty bad

harsh basalt Oct 25, 2024, 4:27 PM

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yea

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lmao

dawn arrow Oct 25, 2024, 4:28 PM

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tepid hawk A book that doesn’t even explain how to call functions is pretty bad

i think i forgot or haven't gone through this topic yet

lilac ruin Oct 25, 2024, 4:29 PM

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@dawn arrow I'm not being mean, but your original question just really doesn't makes sense.

You asked us how to call a function again, but you've never even called it once, and now you're mentioning that you don't know what calling a function means or how to do it

dawn arrow Oct 25, 2024, 4:29 PM

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explaining its not about me

lilac ruin Oct 25, 2024, 4:29 PM

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So it's hard to determine what you're really asking here.

dawn arrow Oct 25, 2024, 4:30 PM

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i`ll try to explain better.

dawn arrow Oct 25, 2024, 4:30 PM

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lilac ruin So it's hard to determine what you're really asking here.

forget about first example

lilac ruin Oct 25, 2024, 4:31 PM

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Ok, no worries. Let's try again. What your code snippet, and what are you trying to ask?

dawn arrow Oct 25, 2024, 4:34 PM

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Okay so, im very new in C++ and im trying to make some type of CMD with custom commands and im need to take user`s command again if user type wrong command

lilac ruin Oct 25, 2024, 4:34 PM

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That makes sense! So what have you got so far

dawn arrow Oct 25, 2024, 4:35 PM

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#include<iostream>
#include<cstdlib>
using namespace std;
int start(char ask) {
    cout << "Hello! This is MyCMD." << endl;
    cout << "CMD: ";
    cin >> ask;
}
int main() {
    system("chcp 1251>nul");
    system("title MyCMD");
    if (ask = "Help" or "help") {
        cout << "Here the list of avaliable commands: \nVersion -- shows current version of MyCMD" << endl;
    }
    else {
        cout << "Wrong command! Enter 'help' to view list of avaliable commands" << endl;
        for 
    }

    return 0;
}```

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so

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what i have to do to make it work properly?

lilac ruin Oct 25, 2024, 4:52 PM

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So going step by step, there are several issues here

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int start(char ask) { ... } is defining a new function, which is never used everywhere. That can just be deleted.

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ask = "Help" doesn't work the way you're expecting. It's not comparing ask to "Help". You need to use == for comparisons. This = is unconditionally assigning "Help" to the ask variable

tepid hawk Oct 25, 2024, 4:53 PM

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The or help is also not going to work

lilac ruin Oct 25, 2024, 4:54 PM

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if (ask == "Help" or "help") still wouldn't work as you expect. You think it's saying if ask is equal to either one, but it's not. You would need if (ask == "Help" or ask == "help")

tepid hawk Oct 25, 2024, 4:54 PM

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lol, I spoiler it

lilac ruin Oct 25, 2024, 4:54 PM

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Near the end, you have a dangling for that's unused. Frankly, I'm surprised it's not a syntax error that fails to compile.

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You use the ask variable several times, but you haven't declared it anywhere

dawn arrow Oct 25, 2024, 5:22 PM

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ok ty

#

#include<iostream>
#include<cstdlib>
using namespace std;
int main() {
    system("chcp 1251>nul");
    system("title MyCMD");
    char ask;
    cout << "Hello! This is MyCMD." << endl;
    cout << "CMD: ";
    cin >> ask;
    if (ask == "Help" or ask == "help") {
        cout << "Here the list of avaliable commands: \nVersion -- shows current version of MyCMD" << endl;
    }
    else {
        cout << "Wrong command! Enter 'help' to view list of avaliable commands" << endl;
    }

    return 0;
}```

lilac ruin Oct 25, 2024, 5:27 PM

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That's a start!

dawn arrow Oct 25, 2024, 5:27 PM

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incompatible operand types ("char" and "const char") and ==: no conversion of "const char [5]" to "int"

lilac ruin Oct 25, 2024, 5:27 PM

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Now the next issue here is that ask is a single char. It's not a string. So ask == "Help" can't possibly work, as ask can only hold 1 character (e.g. 'H' or 'h'

dawn arrow Oct 25, 2024, 5:28 PM

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oohhh

lilac ruin Oct 25, 2024, 5:28 PM

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Precisely. A const char [5] is an array of 5 characters, which is how that "Help" is being interpreted. You can't compare that string to your single character (which is being implicitly promoted to int, which is why that comes up in the error message)

dawn arrow Oct 25, 2024, 5:29 PM

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so, how i can solve this?

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make an array?

lilac ruin Oct 25, 2024, 5:30 PM

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You can define ask as a C string:

std::string ask;

dawn arrow Oct 25, 2024, 5:30 PM

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oh

lilac ruin Oct 25, 2024, 5:30 PM

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(you can use more primitive C types like const char[] or const char *, but that way lies madness, so I didn't show that)

dawn arrow Oct 25, 2024, 5:31 PM

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thank you, now i feel more enlightened

lilac ruin Oct 25, 2024, 5:31 PM

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🙂

dawn arrow Oct 25, 2024, 5:32 PM

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okay

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done but it still says that ==: no conversion of "const char [5]" to "int"

lilac ruin Oct 25, 2024, 5:32 PM

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where?

dawn arrow Oct 25, 2024, 5:32 PM

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nvm

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okay, we`re done with bug fixes

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lets return to the main question

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in other languages i can just put everything in loop

tepid hawk Oct 25, 2024, 5:35 PM

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If you don’t mind, could you mention the book you’re using to learn C++. There are a lot of bad resources when it comes to programming and using any of them can hold you back from learning efficiently.

dawn arrow Oct 25, 2024, 5:35 PM

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so "CMD:" with input will appear every time

dawn arrow Oct 25, 2024, 5:37 PM

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tepid hawk If you don’t mind, could you mention the book you’re using to learn C++. There a...

nvm i just forgot something because one day my parents asked me to do something and its ruined my discipline

dawn arrow Oct 25, 2024, 5:38 PM

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tepid hawk If you don’t mind, could you mention the book you’re using to learn C++. There a...

Author:
Alexey Nikolaevich Vasiliev
Book name:
C++ programming in examples and tasks

timber pumice Oct 25, 2024, 5:40 PM

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Why read someone else when you can read bjarne stroustrup himself 🤔🤔

tepid hawk Oct 25, 2024, 5:43 PM

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dawn arrow Author: Alexey Nikolaevich Vasiliev Book name: C++ programming in examples and ...

I looked it up and it doesn’t even have reviews on Amazon. That’s concerning

dawn arrow Oct 25, 2024, 5:44 PM

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tepid hawk I looked it up and it doesn’t even have reviews on Amazon. That’s concerning

its popular in my region

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4.9

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rating

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tepid hawk Oct 25, 2024, 5:49 PM

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Couldn’t find it from where I’m at

vapid mossBOT Oct 25, 2024, 5:54 PM

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@dawn arrow Has your question been resolved? If so, type !solved :)

remote jacinth Oct 25, 2024, 5:55 PM

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learncpp.com is the usual recommendation around here. Very comprehensive and up-to-date. It may fill in the many gaps you are not seeing.

dawn arrow Oct 25, 2024, 9:51 PM

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#include<iostream>
#include<cstdlib>
using namespace std;
int main() {
    system("chcp 1251>nul");
    system("title MyCMD");
    string ask;
    while (true) {
        cout << "CMD: ";
        cin >> ask;
        if (ask == "Help" or ask == "help") {
            cout << "Here the list of avaliable commands: \nVersion -- shows current version of MyCMD" << endl;
        }
        else {
            cout << "Wrong command! Enter 'help' to view list of avaliable commands" << endl;
        }
        if (ask == "Version" or "version") {
            cout << "Current version is 0.1" << endl;
        }
        else {
            cout << "Wrong command! Enter 'help' to view list of avaliable commands" << endl;
        }

    }
    return 0;
}```

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it was so easy

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bruh

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!solve

vapid mossBOT Oct 25, 2024, 9:51 PM

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Thank you and let us know if you have any more questions!

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#Call function again