for ([assign1] ; [bool_expr] ; [assign2]) statement
assign1
An assignment used to initialize the for loop.
bool_expr
A boolean valued expression tested before each iteration.
assign2
An assignment executed after each iteration of the loop.
statement
A statement (possibly compound, i.e., enclosed in curly brackets)
to be executed in each iteration of the loop.
The for statement provides a looping mechanism similar to the C-language for loop. Assign1 and assign2 are assignment statements using one of the operators '=', '+=', '-=', '/=', '*='. Any of the elements of the for loop may be omitted, except the parenthesis and colon field delimiters.
1. For I equals zero to 10 in steps of 2, increment TOTAL by the value of array element I.
for (i=0; i <= 10; i += 2) total += array[i]
2. Print the first eight powers of two.
j = 1
for (i=1; i <= 8; i += 1) {
print (i, j)
j *= 2
}
BUGS A simple assignment of the form i++ will not work. Only one assigment statement is permitted in the first and third fields.