Controlling a random function

[codeman54]

ok now, the code that randomizes the data ia working. Now, How do I make sure that the names are not repeated?

Note: continuation from this thread

[Killer42]

ok now, the code that randomizes the data ia working. Now, How do I make sure that the names are not repeated?

Note: continuation from this thread

Two techniques come to mind...

• Build an array of the ones which have been used, and check against that array before using each one.
• Somehow flag those in the original array which have been used, so you can skip over them when looking for the next one.

Actually, these are really just two slight variations on the same idea.

[codeman54]

Two techniques come to mind...

• Build an array of the ones which have been used, and check against that array before using each one.
• Somehow flag those in the original array which have been used, so you can skip over them when looking for the next one.

Actually, these are really just two slight variations on the same idea.

i have no idea how to do that but thanxs anyway
if you can explain plus i need to know how to record quiz results

[Killer42]

i have no idea how to do that but thanxs anyway
if you can explain plus i need to know how to record quiz results

I'd rather not explain in too much detail, as it's more beneficial if you think your way through it.

Basically though, I believe you know how to create an array and place values in it, as you are doing that already with your list of presidents. So, you set up another array with the same number of elements, but no values placed in it yet. Each time you pick a president, you copy it to the next available place in the second array. And before picking each president, you loop through the second array to make sure it isn't already there. If it is, choose again.

The other option works more or less the same, except that instead of copying each name into the second array, you simple set a flag (typically Boolean type) to indicate that entry number n has been used.

[codeman54]

I'd rather not explain in too much detail, as it's more beneficial if you think your way through it.

Basically though, I believe you know how to create an array and place values in it, as you are doing that already with your list of presidents. So, you set up another array with the same number of elements, but no values placed in it yet. Each time you pick a president, you copy it to the next available place in the second array. And before picking each president, you loop through the second array to make sure it isn't already there. If it is, choose again.

The other option works more or less the same, except that instead of copying each name into the second array, you simple set a flag (typically Boolean type) to indicate that entry number n has been used.

ok thank you im getting it
do you knw how to have them type in the number of the president and it needs to record the answer and check if it is correct or incorrect and tell them at the end what they scored

[Killer42]

ok thank you im getting it
do you knw how to have them type in the number of the president and it needs to record the answer and check if it is correct or incorrect and tell them at the end what they scored

Most likely by putting entries in another array or two, then reading them back at the end. Play around with it, and see what you can come up with.

As an idea, you could set up an array of type Boolean, in which True represent a correct answer, and False an incorrect one. The index is the question number. (Or you might want to use a different data type with more than two possible values, so you can tell whether they have been set yet).