for loop proc

Format

for(Init, Test, Inc) Statement

First execute Init. Then if Test is true (non-zero), execute Statement. After this execute Inc. Continue checking Test, doing Statement, and performing Inc until Test turns out to be false (zero).

Statement may be a code block or a single statement. Semicolons may be substituted for commas inside the parentheses as a convenience to C/C++ programmers.

Init and Inc may be omitted. If Test is omitted, the loop will continue forever (unless a break, goto, or return instruction is used to get out of the loop).

var/i
for(i=0, i<3, i++)
    world << i

This outputs:

0
1
2

Note

An Inc statement like i += 0.1 is perfectly valid, but you should keep in mind that numerical accuracy is not exact. See Numbers for more information.

C-like syntax

Using the #pragma syntax directive you can change for() to be more like other languages such as C. This uses a semicolon ; in place of commas to separate Init, Test, and Inc. Instead the comma is treated as a way of stringing multiple statements together.

// make this syntax change temporary
#pragma push
#pragma syntax C for
 
var/i,j
for(i=j=0; i<=10; ++i,j+=i)
    world << "A triangle [i] block\s high has [j] block\s total."
 
#pragma pop

See also

• continue statement
• do proc
• for list proc
• while proc