applying a rule in c++ (for loop)

[asingh105]

The payments will start in the amount of 1 dollar. Obviously that is not too much of a price at the beginning. But here are two rules we can apply every month to increase the installments.

Rule A - Double the installment amount.
Rule B - Triple the installment amount.
You are free to apply Rule A every month, but Rule B can be applied only every other month.

To maximize payments.

1st month's payment 1 dollar.
2nd month's payment 2 dollars. (doubled the amount)
3rd month's payment 6 dollars. (triple it every other months)
4th month's payment 12 dollars. (double the amount)
5th month's payment 36 dollars. (triple it every other month)
6th month's payment 72 dollars. (double the amount)
7th month's payment 216 dollars. (triple it every other month)
and so on ...
So a program that will compute the monthly payment amounts you will get over a given number of months.
The program should take the number of months from user and create a loop to compute the payments for each month and output on screen.


SO FAR I have but I do not think this is write because I need the month to have the calculated dollar amount next to it.

	cout << "Here are your monthly installment amounts: " << endl;

	for (int i = 0; i < 12; i++)
	{
			int m;
			cout << "Month " << (i + 1) << ":

[2kaud]

When posting code, please use code tags. go Advanced, select the formatted code and click '#'.

[I have added code tags to the post]

The program should take the number of months from user

Then first you need to ask the user to enter the required number of months (cout) and the program will need to obtain this value into a variable (cin). The variable will be the upper terminating value for the for loop.

months 2nd, 4th, 6th, etc double it - ie for every even month number double the amount
months 3rd, 5th, 7th, etc triple it - ie for every odd month number triple the amount.

[asingh105]

This is what I have, But it just makes the payment 1 I'm not sure how to get the numbers to appear.

	
        int month;
	cout << "For how many months did they say you will recieve payments? "; 
	cin >> month;
	
	cout << endl;
	cout << "Here are your monthly installment amounts: " << endl;

	for (int i = 0; i < 13; i++)
	{
			int Month;
			int payment = 1; 
			cout << "Month " << i << ":       " << payment << endl;
			
			if (i % 2 == 0) 
			{ payment = payment * 2; }
				
			else { payment = payment * 3; }
	}

[asingh105]

I know my payment variable is not right since the outputs just spit 1 i am not sure how to make them double or triple since the first month must be 1

[2kaud]

You ask for how many months to be entered - yet this value is not used in the for loop terminating condition?

Why have a new variable Month within the for loop which isn't used?

As payment is defined within the for loop, it is initialised to 1 for every loop iteration! It needs to be defined/initialised before the loop.

For info,

payment = payment * 2;

is usually written as

payment *= 2;

and the same for +, - /, % etc

As a matter of style, it isn't usual for the opening/terminating braces to be on the same line as code statements as with the if statements. It is more usual as for the for loop.

Also note, that if there is only one statement controlled by the if then/else then the braces can be omitted. Consider

if (i % 2 == 0)
    payment *= 2;
else
    payment *= 3;

[GCDEF]

if (i % 2 == 0)
    payment *= 2;
else
    payment *= 3;

Even simpler

payment *= (i % 2) + 2;

No if statement required.