hpl2:tutorials:forloop
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hpl2:tutorials:forloop [2011/08/14 00:50] thegreatcthulhu |
hpl2:tutorials:forloop [2012/09/12 13:19] jens removed |
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| - | <code cpp> | + | <code cpp>for (counter; condition; step) |
| - | for (counter; condition; step) | + | |
| DoSomething(); | DoSomething(); | ||
| </code> | </code> | ||
| Line 20: | Line 19: | ||
| - | <code cpp> | + | <code cpp>for (counter; condition; step) |
| - | for (counter; condition; step) | + | |
| { | { | ||
| DoSomething(); | DoSomething(); | ||
| Line 44: | Line 42: | ||
| - | Let's take this apart. "void OnStart()" is the location it is in, which happens when the level starts up. | + | Let's take this apart. "void OnStart()" is the location it is in, which happens when the level starts up. |
| - | The "for(int i = 0; i < 4; i++)" runs the loop body (in this case, the loop body adds a timer that will trigger "TimerFunction") 4 times before the loop breaks, because integer "i" has to be less than 4, as stated in the loop condition. \\ | + | The "for(int i = 0; i < 4; i++)" runs the loop body (in this case, the loop body adds a timer that will trigger "TimerFunction") 4 times before the loop breaks, because integer "i" has to be less than 4, as stated in the loop condition. |
| - | NOTE: It's an old programming tradtion to start your counters from 0 - maybe this seems counter-intuitive, but it's often more convenient to do so. Just remember, if you see the initial value of the counter variable set to 0, and the condition states i < 4, a loop like this will execute 4 times, //not// 3. | + | NOTE: It's an old programming tradtion to start your counters from 0 - maybe this seems counter-intuitive, but it's often more convenient to do so. Just remember, if you see the initial value of the counter variable set to 0, and the condition states i < 4, a loop like this will execute 4 times, //not// 3.\\ Why? Look at how the value changes: i= 0, 1, 2, 3 , (4 doesn't execute, as the condition is not true for i=4). |
| - | + | ||
| - | + | ||
| - | Why? Look at how the value changes: i= 0, 1, 2, 3 , (4 doesn't execute, as the condition is not true for i=4). | + | |
| Line 88: | Line 83: | ||
| - | <code cpp> | + | <code cpp>for (int i = 9; i >= 0; i--) |
| - | for (int i = 9; i>= 0; i--) | + | |
| { | { | ||
| FadeLightTo("corridor_light_" + i, 0, 0, 0, 1, -1, 9 - i); | FadeLightTo("corridor_light_" + i, 0, 0, 0, 1, -1, 9 - i); | ||
