DaniWeb Forum Index > Software Development > C++

Problems with While and For Loops (I searched this forum before starting thread)

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Oct 2009

Posts: 4

Reputation: jamesbrad288 is an unknown quantity at this point

Solved Threads: 0

jamesbrad288 jamesbrad288 is offline

Offline

Newbie Poster

Problems with While and For Loops (I searched this forum before starting thread)

Oct 24th, 2009

I'm having trouble with my programming assignment. It's made up of two parts. Part I is a while loop, and part II is a for loop.

The first part counts how many even numbers and how many odd numbers the user types before typing 0. I think I have most of this part complete, but I don't know how to make it determine the odds from the evens. I know I need to use

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
if (num%2 == 0)
if (num%2 == 0)

, but I don't know where it goes, and what else I need to add.

In the second part, the user types in two temperatures. The first temperature is mulitplied by 5 and it loops until the temperature is greater than or equal to the second temperature. I'm pretty sure this is how I set up the rest of the code, but again I'm not sure where it goes.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
cout << “   Celsius  Fahrenheit” << endl;
cout << “------------------------” << endl;
cout << setw(8) << celsius << setw(8) << fahrenheit << endl;
cout << “   Celsius  Fahrenheit” << endl;
cout << “------------------------” << endl;
cout << setw(8) << celsius << setw(8) << fahrenheit << endl;

I have part ii set up how it's essentially supposed to be, but I'm having a hard time putting the pieces together.

And here's the code I have written so far:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
 
using namespace std;
 
const double fahrenheit = 9.0 / 5 * celsius + 32;
 
int main()
 
{
 
   int count = 0, i, j;
 
   char number;
 
   cout << "Enter a non-zero integer (0 to quit): ";
 
   cin >> number;   
 
   while (number != '0')
 
   {
 
   	count = count + 1;
 
   	cout << "Enter a non-zero integer (0 to quit): ";
 
   	cin >> number; 
 
   }
 
   cout << "-----------------------------------------" << endl;
 
   cout << "Even Count:  " << count << endl;
 
   cout << "Odd Count:   " << count << endl;
 
   cout << "-----------------------------------------" << endl;
 
   int i, j;
 
   cout << "Enter beginning Celsius temperature: ";
 
   cin >> i;
 
   cout << "Enter ending Celsius temperature:    ";
 
   cin >> j;
 
   for(i = 0; i < 11; i++)
 
   {
 
      for(j = 1; j <= i; j++)
 
         cout << "*";
 
      cout << endl;
 
   }
 
   return 0;
 
}
#include<iostream>

using namespace std;

const double fahrenheit = 9.0 / 5 * celsius + 32;

int main()

{

   int count = 0, i, j;

   char number;

   cout << "Enter a non-zero integer (0 to quit): ";

   cin >> number;   

   while (number != '0')

   {

   	count = count + 1;

   	cout << "Enter a non-zero integer (0 to quit): ";

   	cin >> number; 

   }

   cout << "-----------------------------------------" << endl;

   cout << "Even Count:  " << count << endl;

   cout << "Odd Count:   " << count << endl;

   cout << "-----------------------------------------" << endl;

   int i, j;

   cout << "Enter beginning Celsius temperature: ";

   cin >> i;

   cout << "Enter ending Celsius temperature:    ";

   cin >> j;

   for(i = 0; i < 11; i++)

   {

      for(j = 1; j <= i; j++)

         cout << "*";

      cout << endl;

   }

   return 0;

}

Here's an example of the output:
Enter a non-zero integer (0 to quit): 89
Enter a non-zero integer (0 to quit): 55
Enter a non-zero integer (0 to quit): 56
Enter a non-zero integer (0 to quit): 1
Enter a non-zero integer (0 to quit): 2
Enter a non-zero integer (0 to quit): 0
-----------------------------------------
Even Count: 2
Odd Count: 3
-----------------------------------------
Enter beginning Celsius temperature: 25.891
Enter ending Celsius temperature: 58.111
Celsius Fahrenheit
------------------------
25.891 78.604
30.891 87.604
35.891 96.604
40.891 105.604
45.891 114.604
50.891 123.604
55.891 132.604

I hope this isn't confusing. I appreciate any help I may receive, and I want to let it be known that I hope I can return the favour to other users on this forum because I know how frustrating this is.

Thanks in advance!

Last edited by jamesbrad288; Oct 24th, 2009 at 12:45 am.

•

Join Date: Aug 2005

Posts: 15,585

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1486

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

-7

Oct 24th, 2009

use the mod % operator to check of the number is odd or even. When (number % 2) == 0 the number is even.

make the data type of number an int, not a char because you can't enter a number greater than one digit in a char. You will also have to change the while loop on line 26 while( number != 0)

Last edited by Ancient Dragon; Oct 24th, 2009 at 12:53 am.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

•

Join Date: Oct 2009

Posts: 4

Reputation: jamesbrad288 is an unknown quantity at this point

Solved Threads: 0

jamesbrad288 jamesbrad288 is offline

Offline

Newbie Poster

Oct 24th, 2009

I know that I need to add "if (num%2 == 0)", but I don't know where it goes. I don't understand why I need to change "while( number != 0)" because I was pretty sure that's how it's suppose to be. When the number is not equal to 0, it loops. In other words, the program will keep going until I type in zero. It's suppose to do that.

As for part two. Knowing what to put in the for loop would help me tremendously. I know that my program has to multiply the temperature by 5 for each loop, but I'm not sure how to set this up.

Thanks.

Last edited by jamesbrad288; Oct 24th, 2009 at 3:34 pm.

•

Join Date: Nov 2008

Posts: 466

Reputation: Grn Xtrm will become famous soon enough

Solved Threads: 39

Grn Xtrm

Offline

Posting Pro in Training

Oct 24th, 2009

In your while loop you will need to include a counter for both odd and even numbers. Also inclyde the if else statement in the while loop. For example:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
while(number != 0)
{
//ask for and accept the number from the user
if(number%2==0)
//increment even counter
else
//increment odd counter
 
}
while(number != 0)
{
//ask for and accept the number from the user
if(number%2==0)
//increment even counter
else
//increment odd counter

}

The only thing you need to change in the while loop is to make 0 an integer not a character with quotes. This is what Ancient Dragon was trying to point out to you.

Last edited by Grn Xtrm; Oct 24th, 2009 at 3:50 pm.

Check out my new band URL on facebook. I'm the bass player. :) Become a fan and leave comments if you like.
URL on facebook!

•

Join Date: Oct 2009

Posts: 4

Reputation: jamesbrad288 is an unknown quantity at this point

Solved Threads: 0

jamesbrad288 jamesbrad288 is offline

Offline

Newbie Poster

Oct 24th, 2009

•

Originally Posted by Grn Xtrm

In your while loop you will need to include a counter for both odd and even numbers. Also inclyde the if else statement in the while loop. For example:
Help with Code Tags

C++ Syntax (Toggle Plain Text)
while(number != 0)
{
//ask for and accept the number from the user
if(number%2==0)
//increment even counter
else
//increment odd counter
 
}
while(number != 0) { //ask for and accept the number from the user if(number%2==0) //increment even counter else //increment odd counter }
The only thing you need to change in the while loop is to make 0 an integer not a character with quotes. This is what Ancient Dragon was trying to point out to you.

My apologies to Ancient Dragon. It was a stupid mistake on my part. In the lab, we used a character to end the loop, and I didn't even notice.

I think I have the part I set up the way it's suppose to be, but the terminal keeps telling me there's a parse error before else (line 27). Here's what I have now:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
 
using namespace std;
 
int main()
 
{
 
   int number, even = 0, odd = 0;
 
   cout << "Enter even integer: ";
 
   cin >> number;
 
   while(number != 0)
 
   {
 
   cout << "Enter even integer: ";
 
   cin >> number;
 
   if(number%2==0)
 
      even++
 
   else
 
      odd++
 
   }
 
   cout << "-----------------------------------------" << endl;
 
   cout << "Even Count:  " << even << endl;
 
   cout << "Odd Count:   " << odd << endl;
 
   cout << "-----------------------------------------" << endl;
 
   return 0;
 
}
#include<iostream>

using namespace std;

int main()

{

   int number, even = 0, odd = 0;

   cout << "Enter even integer: ";

   cin >> number;

   while(number != 0)

   {

   cout << "Enter even integer: ";

   cin >> number;

   if(number%2==0)

      even++

   else

      odd++

   }

   cout << "-----------------------------------------" << endl;

   cout << "Even Count:  " << even << endl;

   cout << "Odd Count:   " << odd << endl;

   cout << "-----------------------------------------" << endl;

   return 0;

}

Thanks.

Last edited by jamesbrad288; Oct 24th, 2009 at 5:13 pm.

•

Join Date: Nov 2008

Posts: 466

Reputation: Grn Xtrm will become famous soon enough

Solved Threads: 39

Grn Xtrm

Offline

Posting Pro in Training

Oct 24th, 2009

You need to put semicolons after the statements in the if/else statements. (i.e. you need semicolons after the increment statements.)

Check out my new band URL on facebook. I'm the bass player. :) Become a fan and leave comments if you like.
URL on facebook!

•

Join Date: Oct 2009

Posts: 4

Reputation: jamesbrad288 is an unknown quantity at this point

Solved Threads: 0

jamesbrad288 jamesbrad288 is offline

Offline

Newbie Poster

Oct 24th, 2009

•

Originally Posted by Grn Xtrm

You need to put semicolons after the statements in the if/else statements. (i.e. you need semicolons after the increment statements.)

Thanks, I appreciate it. It wasn't working correctly at first because I had odd++ and even++ mixed up, but I figured it out, lol. I'm still having some trouble with part ii though. I'm not sure how to set it up, but I don't think I have much more work to do on it. I got the for loop from an example in my book, and I'm not sure how to connect it with fahrenheit and celsius or if I have set the for loop up correctly. Thanks.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
using namespace std;
const double
 
int main()
{
  int celsius, fahrenheit;
 
  cout << "Enter beginning Celsius temperature: ";
  cin >> i;
  cout << "Enter ending Celsius temperature:    ";
  cin >> j;
 
  fahrenheit = 9.0 / 5 * celsius + 32;
 
  for(i = 0; i < 11; i++)
 
  {
     for(j = 1; j <= i; j++)
        cout << "*";
     cout << endl;
  }
 
  cout << “   Celsius  Fahrenheit” << endl
  cout << “------------------------” << endl;
  cout << setw(8) << celsius << setw(8) << farenheit << endl;
 
  return 0;
 
}
#include<iostream>
using namespace std;
const double

int main()
{
  int celsius, fahrenheit;

  cout << "Enter beginning Celsius temperature: ";
  cin >> i;
  cout << "Enter ending Celsius temperature:    ";
  cin >> j;

  fahrenheit = 9.0 / 5 * celsius + 32;

  for(i = 0; i < 11; i++)

  {
     for(j = 1; j <= i; j++)
        cout << "*";
     cout << endl;
  }

  cout << “   Celsius  Fahrenheit” << endl
  cout << “------------------------” << endl;
  cout << setw(8) << celsius << setw(8) << farenheit << endl;

  return 0;

}