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C++ loop

C++ loop, I dont no how to add loop

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julia231	20 Aug, 2008 - 11:48 PM Post #1
New D.I.C Head Joined: 20 Aug, 2008 Posts: 2	a) add a loop to the main (i.e for loop) to create a deposit for each group element add a loop to the main (i.e. for loop) to output the balance of each group element the output loop should also identify which group element is being output ex. group 1 account : balance : 300 ex. group 2 account : balance :600 c) add a new method, named "interest" to the class, this method will accept one parameter, for interest rate. The programmer may also choose to change the data type of the balance variable (for example, the balance variable could be changed to double or float) CODE #include <iostream> using namespace std; class Account { long balance; // current balance in pennies // int may be insufficient in C/C++ public: void deposit (long amount) { balance += amount; } void withdraw (long amount) { balance -= amount; } void status () { cout << "balance : " << balance << endl; } // the following is called a "constructor" - used to initialize new accts Account (long initialAmount = 0) { balance = initialAmount; } // new acct // =0 means that if the initialAmount is omitted it defaults to 0 // the following is a "destructor" ~Account () { cout << "transfer " << balance <<" to manager " << endl; } }; // note ";" required int main () { Account mine, yours (100), group[6]; // allocates 8 Account objects and initialize each with "c-tor" // The second account is initialized with a balance of 100 - others all 0. mine.deposit (500); // now balance should be 500 mine.status(); // " The balance is : 500" yours.status(); // " The balance is : 100" yours.deposit(300); yours.status(); //"The balance is : 400" mine.withdraw(600); // now in the red mine.status (); //" The balance is : -100" return 0; } //8 accounts are destructed here
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no2pencil	20 Aug, 2008 - 11:52 PM Post #2
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 6,328 Thanked 57 times Dream Kudos: 2375 Expert In: Goofing Off My Contributions	An example for loop : cpp #include <stdio.h> int main(void) { int bal=300; // Balance int Max_Group=10; int i; // We use this to compare for(i=1;i<=Max_Group;i++) { printf("Group %d account:\nBalance : %d\n",i,bal*i); } return 0; }
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julia231	20 Aug, 2008 - 11:56 PM Post #3
New D.I.C Head Joined: 20 Aug, 2008 Posts: 2	i still dont realli understand what you mean ?
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no2pencil	21 Aug, 2008 - 12:10 AM Post #4
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 6,328 Thanked 57 times Dream Kudos: 2375 Expert In: Goofing Off My Contributions	The output from the example loop : QUOTE Group 1 account: Balance : 300 Group 2 account: Balance : 600 Group 3 account: Balance : 900 Group 4 account: Balance : 1200 Group 5 account: Balance : 1500 Group 6 account: Balance : 1800 Group 7 account: Balance : 2100 Group 8 account: Balance : 2400 Group 9 account: Balance : 2700 Group 10 account: Balance : 3000 It's just a simple for loop. CODE for(startExpression; testExpression; countExpression) { block of code; }
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OliveOyl3471	21 Aug, 2008 - 04:16 AM Post #5
It's all about the code ♥ Joined: 11 Jul, 2007 Posts: 1,484 Thanked 14 times Dream Kudos: 100 My Contributions	QUOTE(julia231 @ 21 Aug, 2008 - 02:56 AM) i still dont realli understand what you mean ? A for loop just means that as long as the condition in the for loop is true, keep on doing whatever is in the statment(s) part of the for loop. So... as long as i is less or equal to ten, it will keep printing your cout statement. i++ means add one to i each time. So... i starts out with a value of 1, and each time the for loop iterates it adds one to i, so the next time the for loop iterates, i will be 2, then it will be 3, etc. and the loop will continue until the condition (i<=10) is no longer true. %d within the quotes will cause whatever follows the quote to be printed in place of the %d. So... i,bali means that the value of i, then the value of bali will be printed in place of the %d's in the quotes, each time your loop iterates, so the first time the loop iterates 300 will be printed, then the next time bali will be 600, since i is now 2, and it continues until the condition in the for loop is no longer true. I think it's a good idea, as your instructions point out, to change the data type of balance to a float (you could use double but a float will probably work just as well, and it it smaller than a double). An int won't allow you to use decimals, so a float or double is better when dealing with money. Does that help? This post has been edited by OliveOyl3471*: 21 Aug, 2008 - 04:29 AM
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DTR	21 Aug, 2008 - 05:26 AM Post #6
New D.I.C Head Joined: 7 Aug, 2008 Posts: 33 My Contributions	Why are we offering for as an example anyway? CODE int i = 0; while(i < 1000) //While variable i contains a value that is lesser than 1000 { printf("lol"); i++; } // Yes, there is no indexing in this example, but meh! For me at least the basic While-loop was much less confusing when learning things out. for(beginState; condition; changeOfState) just felt confusing... I frankly don't know why. Edit: Oh, "i.e for loop".... Gee, should read the posts every once in a while. This post has been edited by DTR: 21 Aug, 2008 - 05:30 AM
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gabehabe

21 Aug, 2008 - 05:52 AM

Post #7

Working Girl.

Joined: 6 Feb, 2008
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Why use a while loop when you can use a for loop?

It's much more concise, everything to do with the loop is in one place.

Comparision:

cpp

#include <iostream>
using std::cout;
using std::endl;
using std::cin;

int main ()
{
    for (int i = 0; i < 20; i++)
        cout << i << endl;
    cin.get ();
    return EXIT_SUCCESS;
}

is much easier to read than:

cpp

#include <iostream>
using std::cout;
using std::endl;
using std::cin;

int main ()
{
    int i = 0;
    // have about 500 lines of code here
    while (i < 20) // what was i again? I forgot by the time I reached this line...
        cout << i << endl;
    cin.get ();
    return EXIT_SUCCESS;
}

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KYA	21 Aug, 2008 - 06:08 AM Post #8
#include <nerd.h> Joined: 14 Sep, 2007 Posts: 4,205 Thanked 50 times Dream Kudos: 1150 My Contributions	I second gabe's post. For loops are cleaner and all conditions are laid out at the front, no "hidden" agenda.
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DTR	21 Aug, 2008 - 07:16 AM Post #9
New D.I.C Head Joined: 7 Aug, 2008 Posts: 33 My Contributions	Thats just stupid way of initializing i far away from its using spot. We can screw up For if we really try too. CODE #include <iostream> using std::cout; using std::endl; using std::cin; int main () { for (int i = 0; i < 20; i++) cout << i << endl; cin.get (); return EXIT_SUCCESS; }
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gabehabe	21 Aug, 2008 - 07:21 AM Post #10
Working Girl. Joined: 6 Feb, 2008 Posts: 5,402 Thanked 94 times Dream Kudos: 2625 Expert In: Dingleberries My Contributions	That doesn't screw it up in the slightest. It's just messy indentation. All I'm saying is that for is much more efficient that while when you want to loop a set number of times. while, and do/while are best when you want to run a loop until a set statement is true. (A sentinel value)
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DTR	21 Aug, 2008 - 07:29 AM Post #11
New D.I.C Head Joined: 7 Aug, 2008 Posts: 33 My Contributions	Thats just stupid way of initializing i far away from its using spot. We can screw up For if we really try too. CODE #include <iostream> using std::cout; using std::endl; using std::cin; int main () { int beginningPointForsomeObscureLoop = 5; // Some 500 lines of code here for (int i = beginningPointForsomeObscureLoop; i < beginningPointForsomeObscureLoop+20; i++) // What was that value again? cout << i << endl; cin.get (); return EXIT_SUCCESS; }
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