Teledyne LeCroy Protocol Analyzers File-Based Decoding User Manual - Manual (Page 29)

File-based Decoding User Manual Chapter 7: Statements
LeCroy Corporation
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7.5 for Statements
A for statement takes the form:
for (<expression1>; <expression2>; <expression3>) <statement>
The first expression initializes, or sets, the starting value for x. It is executed one time,
before the loop begins. The second expression is a conditional expression. It determines
whether the loop continues. If it evaluates true, the function keeps executing and
proceeds to the statement. If it evaluates false, the loop ends. The third expression is
executed after every iteration of the statement.
The example
str = "";
for ( x = 2; x < 5; x = x + 1 ) str += FormatEx ( "%d", x );
would output
str == "234"
The example above works out like this: the expression x = 2 is executed. The value of
x is passed to x < 5
, resulting in 2 < 5. This evaluates to true, so the statement
FormatEx ( "%x", 1 ) is performed, causing "2" to be concatenated to str. Next, the
third expression is executed, and the value of x is increased to 3. Now, x < 5 is
executed again, and is again true, so the FormatEx statement is executed, causing "3"
to be concatenated to str. The third expression increases the value of x to 4; 4 < 5 is
true, so "4" is concatenated to str. Next, the value of x increases to 5. 5 < 5 is not true,
so the loop ends.
Figure 7.1 Execution of a for Statement