C-calculator while

The C-calculator mode while construction has a syntax similar to that of standard C. In interactive mode, any new input line will be prompted with a ``n{...n\t'' where `n' stands for the nesting level and `\t' for a tab. Recall that cmode-line-statement means a string of semicolon separated C-calculator mode commands.

while (conditions) cmode-line-statement or while (conditions)
cmode-line-statement or