100 lines
1.4 KiB
Markdown
100 lines
1.4 KiB
Markdown
# Value cloning
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Sometimes in Granite, you may want to _clone_ variables. This is fairly easy with one operation!
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## New operations
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* `:%(source),(target)`, variable clone, sets `(target)` to the value in `(source)`
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## Tutorial
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Imagine you want to create a program to calculate a Fibonacci sequence up to a certain term.
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The first two numbers of the sequence are 0 and 1 and each next term is the sum of the previous two meaning that number #3 is number #1 (0) plus number #2 (1)
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We can begin the program by initialising and printing the first terms and the counter and asking the user for a term:
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```
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:0 Init variables and ask user for term
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:?a
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:>2,i
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:>0,x
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:>1,y
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:>0,z
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:0 print term 0 and term 1 and stop if user didnt want more
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:!x
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:=exit,a,0
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:!y
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:=exit,a,1
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:0 increment a for loop purposes
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:^a
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```
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Now for the loop, first we want to perform the addition and increment i:
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```
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:@loop
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:ax,y,z
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:!z
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:^i
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```
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Now we want to move the new term into `y` and the `y` term into `x`.
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```
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:%y,x
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:%z,y
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```
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We need to clone the `y` term into `x` _first_
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Now add the loop operation and premature exit label.
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```
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:-loop,i,a
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:@exit
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:~
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```
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Now run the program, you'll get an output similar to this after entering a number:
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```
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? 12
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0
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1
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1
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2
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3
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5
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8
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13
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21
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34
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55
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89
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144
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```
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Congratulations! Now you can clone variables!
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## After example
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```
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:?a
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:>2,i
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:>0,x
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:>1,y
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:>0,z
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:!x
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:=exit,a,0
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:!y
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:=exit,a,1
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:^a
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:@loop
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:ax,y,z
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:!z
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:^i
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:%y,x
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:%z,y
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:-loop,i,a
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:@exit
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:~
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```
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