C++ Loops

[Skreedles]

I'm stumped, how do I write a loop where I put in a positive number, then I input another number and the loop counts until the otehr number and sums all of the numbers along the way.

 

Ex. I input 1,

Then I input 3

 

The program would go:

 

1

2

3

 

sum = 6.

 

how I understand it is:

 

cout << what is your first number?

cin >> firstnumber

 

cout << What is your second number?

cin>>secondnumber

 

while(firstnumber < secondnumber && firstnumber > 0)

      {

        firstnumber + firstnumber ++

       }

cout << firstnumber

 

I know I ahven't decalred all of my integers and etc. but this is the just of what I'm at.

[CornOnJacob]

It should be "firstnumber++" not "Firstnumber + firstnumber++". The ++ makes it go up by one, so you don't need more addition. You should also consider using a For loop:

for (i=firstnumber, i<=secondnumber, i++) {     cout << i;}

Forgive my bad syntax. I haven't used C++ in a long while.

[Mrcrysis2000]

You should do your own homework.

[Nrøjbrot]

If you can say what you get when compiling this that might help (i think, i am also a c++ noob )

[Skreedles]

You should do your own homework.

 

I didn't say "hey guys do this for me!" I asked if anyone could help me with a problem I'm having, because I'm not understanding how it is written out in my text, nor how my instructortries to explains C++.

[Kuzma]

It should be "firstnumber++" not "Firstnumber + firstnumber++". The ++ makes it go up by one, so you don't need more addition. You should also consider using a For loop:

for (i=firstnumber, i<=secondnumber, i++) {     cout << i;}

Forgive my bad syntax. I haven't used C++ in a long while.

+=

or

-= is what I use for operations if I remember correctly

[Skreedles]

It should be "firstnumber++" not "Firstnumber + firstnumber++". The ++ makes it go up by one, so you don't need more addition. You should also consider using a For loop:

for (i=firstnumber, i<=secondnumber, i++) {     cout << i;}

Forgive my bad syntax. I haven't used C++ in a long while.

 

I finally found this in my book.

[Ciccioo]

it looks like you already know that you need to declare the integers, so that might be a good start

then, you could try pushing "compile" and see what the compiler has to say

[CornOnJacob]

+=

or

-= is what I use for operations if I remember correctly

"++" is the same as "+= 1" and "--" is the same as "-= 1". Either one should work.

[Nallown]

"++" is the same as "+= 1" and "--" is the same as "-= 1". Either one should work.

Yerp that's correct, x += y means add y to x and where as x++ means increment x so in loops if you just want to increase by 1 then you'd use x++ but if you'd want to increment lets say by a dynamic integer then you'd use x += y where y is the dynamic int.

Same thing goes for -= and -- but that instead subtracts and decrements

[.:MARK:.]

Yeah like @Nallown said it, however if the shorthand confuses you, its OK to use y = x + y.

[Ciccioo]

"++" is the same as "+= 1" and "--" is the same as "-= 1". Either one should work.

 

Yerp that's correct, x += y means add y to x and where as x++ means increment x so in loops if you just want to increase by 1 then you'd use x++ but if you'd want to increment lets say by a dynamic integer then you'd use x += y where y is the dynamic int.

Same thing goes for -= and -- but that instead subtracts and decrements

 

Yeah like @Nallown said it, however if the shorthand confuses you, its OK to use y = x + y.

 

i think he needs a working algorithm first, maybe with a code which actually compiles, that'd be sweet

[CornOnJacob]

i think he needs a working algorithm first, maybe with a code which actually compiles, that'd be sweet

@Skreedles already has this (which is the right idea, just broken):

while(firstnumber < secondnumber && firstnumber > 0)      {        firstnumber + firstnumber ++       }cout << firstnumber

If he changes it to this, then it should work just fine:

while(firstNumber <= secondNumber && firstNumber > 0) //Capitalization of vars makes it easier to read, no functional change{        cout << firstNumber;        firstNumber++;}

If he wants the sum of the numbers too, then he can do this:

while(firstNumber <= secondNumber && firstNumber > 0)      {        cout << firstNumber;        sumOfNumbers += firstNumber;        firstNumber++;      }cout << sumOfNumbers;

[Skreedles]

It should be "firstnumber++" not "Firstnumber + firstnumber++". The ++ makes it go up by one, so you don't need more addition. You should also consider using a For loop:

for (i=firstnumber, i<=secondnumber, i++) {     cout << i;}

Forgive my bad syntax. I haven't used C++ in a long while.

Thank you I ended up adapting off of this.

[CornOnJacob]

Thank you I ended up adapting off of this.

Happy to help

If you're all set then hit "Mark Solved" on the post that solved your problem.

[Ciccioo]

@Skreedles already has this (which is the right idea, just broken):

it looked more like a wrong syntax for a wrong algorithm

 

If he wants the sum of the numbers too, then he can do this:

that's actually the only thing that he asked for in the first post

 

he can do it like this

while(firstNumber <= secondNumber)         sum += firstNumber++;

[Nallown]

 

it looked more like a wrong syntax for a wrong algorithm

 

that's actually the only thing that he asked for in the first post

 

he can do it like this

while(firstNumber <= secondNumber)         sum += firstNumber++;

Might aswell use for then

for(int x = firstNumber; x <= secondNumber; x++){sum += x;}

[Ciccioo]

Might aswell use for then

for(int x = firstNumber; x <= secondNumber; x++){sum += x;}

i didn't go for a 'for' loop because the initialization is already done, by the way it's almost a matter of taste, the thing that the OP should consider is the usage of a totalizer and a loop

will he? won't he? god knows