Difference between revisions of "For"
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| − | + | __NOTOC__ | |
{{Global Header}} | {{Global Header}} | ||
{{Global Announcement}} | {{Global Announcement}} | ||
== Overview == | == Overview == | ||
| − | A | + | A "for" loop performs a set of commands for each iteration of the loop. |
== Usage == | == Usage == | ||
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*For loop that increments a variable by 1 on each pass | *For loop that increments a variable by 1 on each pass | ||
int i,count; | int i,count; | ||
| − | for (i=0,count=0;i | + | for (i=0,count=0;i<=4;i++) { |
count++; | count++; | ||
} | } | ||
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* For loop which logs all the indexes of the msg array which the send_wait function returns | * For loop which logs all the indexes of the msg array which the send_wait function returns | ||
int i; | int i; | ||
| − | send_wait(0, top_object(), | + | send_wait(0, top_object(), "call_attr", "cnt", "get_groups_by_persid", "cnt:776B094702EABB4B87F04A139E72D44B"); |
| − | for (i=0;i | + | for (i=0;i<msg_length();i++) { |
| − | logf (SIGNIFICANT, | + | logf (SIGNIFICANT, "Msg index #%s: %s", i,msg[i]); |
} | } | ||
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i=5; | i=5; | ||
for (i;;) { | for (i;;) { | ||
| − | if (i | + | if (i>-1) {--i; } else {return;} |
} | } | ||
This will exit i reaches a value of -1 | This will exit i reaches a value of -1 | ||
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Revision as of 12:44, 18 November 2010
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Overview
A "for" loop performs a set of commands for each iteration of the loop.
Usage
for (starting number;while;increment)
You do not have to specify all (or any) of the three values within the, although not doing so may result in an infinite loop. You must have code within the loop itself to exit if you choose to exclude these values. Also, if you do not specify a value you still must use the semi-colon(;) as a separator.
Examples
- For loop that increments a variable by 1 on each pass
int i,count;
for (i=0,count=0;i<=4;i++) {
count++;
}
This will increment the count var to 5.
- For loop which logs all the indexes of the msg array which the send_wait function returns
int i;
send_wait(0, top_object(), "call_attr", "cnt", "get_groups_by_persid", "cnt:776B094702EABB4B87F04A139E72D44B");
for (i=0;i<msg_length();i++) {
logf (SIGNIFICANT, "Msg index #%s: %s", i,msg[i]);
}
- For loop which does not specify all three values
int i;
i=5;
for (i;;) {
if (i>-1) {--i; } else {return;}
}
This will exit i reaches a value of -1
