I am trying to output 9 integers counting by 3.

Question

1.00/5 (1 vote)

See more:

This code is supposed to output 3, 6, 9, and so forth. It is outputting 3, 4, 5 ,6 etc.
Can you tell me how to whats wrong and how to fix it?
cout<<"counting by 3"<<endl;
int b=1, e=2;
for (int d=1; b<10; b++) {
d=b+e;
cout<<" "<< d<<" ";}

What I have tried:

This code is supposed to output 3, 6, 9, and so forth. It is outputting 3, 4, 5 ,6 etc.
Can you tell me how to whats wrong and how to fix it?
cout<<"counting by 3"<<endl;
int b=1, e=2;
for (int d=1; b<10; b++) {
d=b+e;
cout<<" "<< d<<" ";}

Posted 26-Jan-19 15:06pm

Member 13010616

Updated 27-Jan-19 7:15am

Add a Solution

4 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Patrice T · Answer 1 · 2019-01-26T15:25:00

Quote:
Can you tell me how to whats wrong

Your code is a mess, use the debugger to see what each part is doing.

Your code do not behave the way you expect, or you don't understand why !
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

1.11 — Debugging your program (stepping and breakpoints) | Learn C++[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

OriginalGriff · Answer 2 · 2019-01-26T21:57:00

Solution 3

Or ... there is the readable version:

C++

int limit = 12;
int start = 3;
string separator = "";
for (int value = start; value <= limit; value += 3)
   {
   cout << separator << value;
   separator = ", ";
   }
cout << endl;

Posted 26-Jan-19 21:57pm

OriginalGriff

Comments

Nelek 27-Jan-19 7:59am

nope... you only give 4 integers out :) BTW I am copying a bit of your answer... I am lazy to write all down :P

OriginalGriff 27-Jan-19 8:10am

I didn't want to do all of his homework!

Nelek 28-Jan-19 1:42am

Good point

Nelek · Answer 3 · 2019-01-27T02:03:00

Solution 4

Here is another possibility:

C++

for (int i = 0; i < 5; i++)
{
   cout << separator << i*3 << endl;
}
// Result: 
//3
//6
//9
//12

Posted 27-Jan-19 2:03am

Nelek

Updated 27-Jan-19 19:47pm

v5

Comments

OriginalGriff 27-Jan-19 8:09am

Plagiarism! Hah! Off to S&A I go! :laugh:

Nelek 28-Jan-19 1:41am

You are right.. I forgot to quote you :)

Nelek 28-Jan-19 1:46am

You frightened me... I have changed my code to avoid plagiarism :P

Member 13010616 · Answer 4 · 2019-01-26T18:10:00

Solution 2

I was doing it wrong. Here is my homemade solution:

C++

for (int b=1, d=0, e=2; b<10; b++) {
d=e+b; e+=2;
 cout<<d<<" ";}

Posted 26-Jan-19 18:10pm

Member 13010616

Updated 27-Jan-19 2:05am

v2

Comments

Patrice T 27-Jan-19 4:22am

it look complicated in your head.

Nelek 27-Jan-19 8:05am

you are still doing it way too complicated, look Solution 4

I am trying to output 9 integers counting by 3.

4 solutions

Solution 1

Solution 3

Solution 4

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us