Thread: Question array loop

You're spoiling the fun

Heheh, what fun? It's not like this is an NP complete problem.

You're right; if you don't care about namespaces you can use eithe

Well now, miracles do happen. I was talking out my butt based on stuff I'd heard before, but actually being right is a nice change.

I am still bit confussed someone else on another forum said to do it this way as I am new to c++ and not yet heard or the rand function.

Code:

int myArray[10];
int i;
for ( i = 0; i < 5; i++) // it is offset so 0-9
{
//can add a cout here//
myArray[i] = rand() % 100;
}

Surley what that is doing is saying i = o if 5 is less than 0 add one so that gonna got like count up 1,2,3,4,5, but what that doing how is that adding up myArray what is 10,20,30,40,50,60,70,80,90,100 ?

Or is i setting up the 10 differnt myArrays then the next bit saying

myArray[i](what will have 9 there = a randomd number modual 100 ?
Edit/Delete Message

rand() produces a pseudo-random number. When you % it with a number, it's putting a limit on how big the number can be. This means you'll receive a number in between 0 and 99 (inclusive).

Your index of i inside the for loop will not fill the array. It will only cycle 5 times. This means that array[0] to array[4] will be filled with random numbers from 0 to 99 while array[5] to array[9] will be filled with any arbitrary values that you cannot guarentee.

so basically what happen is it start at 0 and then increments it each time applying a random number so the loop goes 0 random number, 1 random number, so on so on untill 9 as I want an Array with 10 values

then how would i work out the average once the loop has run throught all 9 and gave each a random value?

Add them up (for example in the same loop) and divide by how many elements your array happens to have.

so if that add a random value to each array how do I then add them and divide by 10?

Create a variable... call it total and set it to 0. Now write a loop that goes through every element of your array and adds it to total and stores the result inside total.

Hint:

Code:

...
total += array[i];
...

Now when you're done with that, divide total by the size of the array, and that will be the average of all numbers inside your array.

Originally Posted by MILLWALLL

so if that add a random value to each array how do I then add them and divide by 10?

That question has been answered in post #2, #4 and #13.