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post #1 of 15

2/19/12 at 2:57pm

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Zaxbys

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Can someone explain for loops to me. I have been researching a GOOD easy method on how to understand them but I am at a loss

Here is the assignment I am struggling with

Thanks ahead of time for any advice

~Zax

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post #2 of 15

2/19/12 at 3:25pm

appleg33k85
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Format:

{for (initialize; booleanExpression; increment)

{
Statement(s)tobeexecuted
}

i.e.

for (ctr = 1; ctr <= 10; ctr++)

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post #3 of 15

2/19/12 at 3:26pm

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Zaxbys

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So far here is my code:

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
          
            for(int i = 1; i < 8; i++)


        }
    }
}

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post #4 of 15

2/19/12 at 3:31pm

l1o2l
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Inside the for loop, use modulus to determine if its an odd or even number.

For example, if(i%2 !=0), not even. i%2 == 0 is even

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post #5 of 15

2/19/12 at 3:34pm

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Zaxbys

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Quote:

Originally Posted by l1o2l

Inside the for loop, use modulus to determine if its an odd or even number.
For example, if(i%2 !=0), not even. i%2 == 0 is even

Whats a modulus?

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post #6 of 15

2/19/12 at 3:36pm

finger00
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Then use another variable like 'product' to store your product. You need to assign it a value of 1 before you enter the loop though. It could go like this (inside the for loop):

{
if (i%2=1) then{
product = i * product
}
}

Pardon my syntax if it is wrong, I'm mostly used to VB

EDIT: Modulus is the rest you get from dividing two numbers

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post #7 of 15

2/19/12 at 3:39pm

lloyd mcclendon
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Code:

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
           
          int product = 1;
          for(int i = 1; i < 8; i += 2)
          {
                   product *= i;
          }
        }
        Console.write(product);
    }
}

i don't have a c# compiler to test it (thank god) but i think that will do the trick.

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post #8 of 15

2/19/12 at 3:40pm

l1o2l
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Modulus gives you the remainder when you divide 2 numbers.

When you divide two even numbers, the remainder becomes 0.

When you divide an odd number with an even number, the remainder is not zero.

int product =1;
for (int i = 1; i < 8; i++)
{
if(i%2 !=0)
{
product = i *product;
}
}

You want to initialize product to 1 also, otherwise it might have a really weird number.

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post #9 of 15

2/19/12 at 3:44pm

Mullinz
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For loops are pretty awesome, once you understand them you can do a lot with them!

Basically you are telling the program to do a certain thing for x number of times.

So if you do
int count = 0;
for(int i = 0; i < 5; i++){
count++;
}

The program will go through the for loop 5 times and each time add one to count, at the end of it making count = 5

You can also make use of the variable i and use it within the loop for whatever you might need it for. As others have said you will have to use the modulus operator to find odd numbers.

Hope this helps a little!

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post #10 of 15

2/19/12 at 3:46pm

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I'd do a I+2 instead of modulus for odd numbers just for consistencies sake in using both odd and even numbers whenever you want to. But that's just me, there's usually something wrong with how I do stuff

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