FAQ: Hello World! - Pattern

This community-built FAQ covers the “Pattern” exercise from the lesson “Hello World!”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Pattern

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Yea sweet lets start off learning c++ by having the user guess what arbitrary number of spaces are required to pass the specs

14 Likes

Is is necessary to write std:: ?
Can we only write cout<<?

1 Like

tabs over spaces, why use spaces for this?

1 Like

I’ve been waiting for quite some time for this C++ course to come out, and i really like it! The only thing that i think is weird is that i can t see what it says it wants me to make it say, so then i have to see the solution, when i want to keep trying.

You can type:

using namespace std;

at the beginning of your program to not have to type std:: every time in your program.

Hi can someone pls tell me what I am doing wrong? I pass the exercise but on the right side it isn’t the same pattern.

#include

int main()
{

#include

int main()
{

std::cout << " 1\n";
std::cout << " 2 3\n";
std::cout << " 4 5 6\n";
std::cout << “7 8 9 10\n”;

}
}

Should be like this.

I am not able to jump the next level after printing the numbers from 1 to 10… why so?

Howdy All …
just farting around and I took a diffrent approach, learning to consolidate and comment code, requardless of language. Nothing EPIC or earth shattering but my 1st thoughts were:

code

    1
  2 3
4 5 6

7 8 9 10

it took a few tries to the align columns created. More important is it ran …follow the examples and understand the code. Then substitute and " see what happens if I change this " …
Trial and error with code is important if you want to learn how to debug!! -lol-
a good habit is developed a take sometime and investigate. It saved a few lines of code and I had to think to make it work, the space looks weird but it runs. baby steps for me and how it works >>>>>>>>>

or use the following code.

#include <iostream>
#include <stdint.h>

using namespace std;

int main()
{

  uint16_t line=4,num=1, f;//You can play with line to print more numbers
  uint8_t b=line,FS;//FS=Front space
  if(line<5){f=2;}
  else if (line>=5&&line<14){f=3;}
  else {f=4;}//increase if statement and adjust f value for more lines

  for (uint8_t a=1;a<=line;a++){
        for (FS=b*f;FS>=1;FS--){
            cout<<" ";
        }
        for (uint8_t aa=1;aa<=(a-1);aa++){
                printf("%0*d ",(f-1),num);
                num++;
        }
        printf("%0*i\n",(f-1),num);
        num++;
        b--;
  }
}

or like…

#include

int main()
{

std::cout << " 1\n 2 3\n 4 5 6\n7 8 9 10\n";

}

Doing coppers way certainly works but you’d have to add in the extra spaces to maintain the format of the original output they posted.
For visually learning, I just did it the way below to keep the spacing apparent. Not necessarily the cleanest though.

#include <iostream>

int main() 
{
  
  std::cout << 
"       1\n"
"     2 3\n"
"   4 5 6\n"
"7 8 9 10\n";

}

I feel like this is a bug in their program. The output doesn’t match the description of what they’ve asked you to do. I don’t think doing a std::cout << for every single number is necessarily the most efficient, but that isn’t the point here. I did the exercise correctly based on the description and illustration - resulting in an output exactly like the one shown - but wound up having to accept the program’s solution over my own.

Nowhere does it display or ask the user to create a triangle of numbers.

Hello @sneakysquid09. Welcome to the forum.

You are exactly right. The exercise instructions do not describe the output the SCT expects. There is also an error here:
image
The actual output would be:

Hello
Goodbye

I will report this bug directly to the Codecademy Team. Thanks for bringing attention to this matter!

Update:

The instruction panel has been corrected: