Enhance Your Coding Skills: FOR Loop and Array Problem Solving Resources

[RadiationX]

Does anyone know of a site that has some problem solving using FOR loops and or Arrays?

 

[Dr Transport]

What language?

 

[RadiationX]

I'm Looking For Something That Is Not Langauge Specific, But If I Had To Choose A Langauge Visual Basic Would Be The One. Thx

 

[dduardo]

A for statement does three things:

Assign a starting value to a counter variable
Increments the counter variable by a specified amount
Checks to see if the expression which makes the loop continue holds true

For example in C++:

for( int x = 0; x < 5 ; x++) { some code}

When the computer first enters the for loop the first thing it does is set x to the value 0. Then it checks the condition to see if it should enter the loop. Since x which is equal to 0 is in fact less than 5 it executes some code. When it finishes it increments x by 1 and then checks to see if the condition still holds. If it does it executes some code, increments x by 1 and checks to see if the condition still holds. This basic sequence happens over and over again until the condition is false, at which point it leaves the for loop.

 

[ceptimus]

In Visual Basic, the syntax is a bit different.

DIM A(10)

gives you eleven variables to play with, called A(0), A(1), ... A(10)

the FOR statement works like this:


FOR J = 1 TO 10

... do some stuff ...


NEXT


this makes J take the value 1 for the first pass through the loop, 2 for the second and so on up to 10 the last time through.

To make the values of A() be the seven times table, you could do something like:

DIM A(12)

FOR J = 1 to 12

A(J) = 7 * J

NEXT


If you want the loop variable to go in steps other than 1 you add a step clause:

FOR J = 0 to 20 STEP 2

PRINT J
' this loop will print 0, 2, 4, 6, ... 18, 20

NEXT