Basic C++ loop help - Overclock.net

ImmortalKenny · 03-29-09

I'm making a program for my C++ class right now and I hit a roadblock.

This is what the program will do:
- Gets a number from a user
- The number goes into the variable cityAmount
- A loop runs for the amount that cityAmount is. (If cityAmount is 5, the loop will run 5 times).

I'm thinking I should use a for loop (right?), but I'm stumped as to what I need to type inside the parentheses of the loop. Yes, I know, a very nooby question.

Thanks all for the help. After I get this question answered, I'll probably ask a couple more.

mrtn400 · 03-29-09

You want to use a loop that creates an int that's set to 0, have it run as long as the int is less than cityAmount, and then increment the int by one after every pass.

**gonX** · 03-29-09

I'm not too good on c++, but you basically want it to do this:

1) Ask for number
2) Set number to cityAmount
3) If cityamount is not 0 or below, continue running script:
3a) Subtract 1 from cityAmount

mrtn400 · 03-29-09

Quote:

Originally Posted by gonX

I'm not too good on c++, but you basically want it to do this:

1) Ask for number
2) Set number to cityAmount
3) If cityamount is not 0 or below, continue running script:
3a) Subtract 1 from cityAmount

That would work, but I would personally keep cityAmount intact for further manipulation/use in the program.

smoke12291 · 03-29-09

it's been a while since C++ classes for me, but something along these lines?

Code:

int x;

cout << "enter a number" << endl;
cin >> cityAmount;

for (x = 0; x < cityAmount; x++) {
cout << "loopity =p" << endl;
}

for a "for" loop think

for (this number; while this number is compared to another; then do this) {
blah
}

mrtn400 · 03-29-09

Quote:

Originally Posted by smoke12291

it's been a while since C++ classes for me, but something along these lines?

Code:

int x;

cout << "enter a number" << endl;
cin >> cityAmount;

for (x = 0; x < cityAmount; x++) {
cout << "loopity =p" << endl;
}

You shouldn't do other people's homework, you should teach them how to do it.

Manyak · 03-29-09

this is the for loop structure:

Code:

for (<command 1>; <command 2>; <command 3>)
{
          .....stuff you want looped goes here......
}

<command 1>: This command is executed only once at the start of the loop, before any others
<command 2>: This command is executed before each new run through the loop, and if it turns up false it stops running the loop
<command 3>: This command is executed at the end of each run through the loop

So in your case, you could do this:
for (int counter = 1; counter <= cityAmount; counter++)

Just remember you don't have to use an int and counter, you can stick any valid C++ commands you want in those spaces, including function calls.

ImmortalKenny · 03-29-09

Quote:

Originally Posted by mrtn400

You want to use a loop that creates an int that's set to 0, have it run as long as the int is less than cityAmount, and then increment the int by one after every pass.

Quote:

Originally Posted by Manyak

this is the for loop structure:

Code:

for ( <command 1>; <command 2>; <command 3>)
{
          .....stuff you want looped goes here......
}

<command 1>: This command is executed only once at the start of the loop, before any others
<command 2>: This command is executed before each new run through the loop, and if it turns up false it stops running the loop
<command 3>: This command is executed at the end of each run through the loop

So in your case, you could do this:
for (int counter = 1; counter <= cityAmount; counter++)

But generally speaking you don't have to keep it this simple, you can stick any valid C++ commands you want in those spaces, including function calls.

Thanks you two for the help!

Now the next step of this program is to have the user enter temperatures for the amount that the user asked.

If the user entered 5 cities, the console would ask the user to:

"Enter city temp 1: "
"Enter city temp 2: "
"Enter city temp 3: "
"Enter city temp 4: "
"Enter city temp 5: "

Each temperature that they enter goes into its own variable. Then an average for the city temperatures gets calculated.

I have the loop running perfectly, I'm stuck at the part where I need to create separate variables for each city's temperature.

psycho12345 · 03-29-09

In that case, you need to use an array. For reference to C++ topics and basic primers go here: http://www.cplusplus.com/

ImmortalKenny · 03-29-09

Quote:

Originally Posted by psycho12345

In that case, you need to use an array. For reference to C++ topics and basic primers go here: http://www.cplusplus.com/

Hmm, I knew I could use an array, but the assignment never mentioned anything about it. Is there any way around using arrays?

This is the assignment:

Quote:

Lab Overview – Scenario / Summary: Formulate a C++ program solution that asks the user for how many cities to calculate an average temperature for; then do the calculation and the print out. Techniques required in this Lab include the usage of a loop of your choice and 2 methods. The first method is for returning the temperature the user inputted for a given city, but which does not require any parameters. The other method (which should require parameters) is for calculating the average temperature across all cities but does not return the value back; consequently it does a print out of the value.

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Basic C++ loop help

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