While Let

Common syntax

while x < 5
print x
x + 1
/while

To increment a variable, Scriptol uses x + 1.
This could not work in C and other languages.

Infinite loop in C

The C and C-like languages (C++, Java, C#) leads easily into infinite loop. Here hare two simple examples.

while(x < 5);
{
printf("%d\n", x);
x += 1:
}

Perhaps you have instantaneously noticed it (and perhaps no), but the construct is bad, due to the semi-colon after the condition!

Another example without the misplaced semi-colon:

while(x < 10)
{
  printf("%d\n", x);
  if(x = 5) continue;
  ... some statements ...
  x += 1;
}

Once x reaches a value of 5, the counter never can change, because incrementing is skipped by the "continue" statement, and the loop never can stop.

While let

Scriptol uses a secure syntax to prevent infinite loop:

while x < 10
  print x
  if x = 5 continue
  ... some statements ...
let x + 1

In Scriptol, the "continue" statement jumps to the "let" statement, and the variable is incremented in this statement.