Related: Programming MOC
The purpose of a counter (aka a loop counter or loop iterator), is to keep track of the number of iterations of a particular event in a program.
Useful if you need to keep track of how many times a loop is performed, for example a while loop.
In python, it’s actually pretty easy to include a counter for for loops. But for scheme you have to add them separately.
Python examples
n=0
while n < 5:
print(n)
n=n+1
mysum =0
for i in range(7,10):
mysum += i
print(mysum) Scheme examples