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How do I empty all the values inside a variable char array[256];?

I tried a for loop assigning an empty value at each iteration, but it doesn't compile.

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Please post this loop. –  Nick Gammon Jul 14 at 2:53
2  
You can't "empty" an array, you can only fill it with meaningless values. –  Ignacio Vazquez-Abrams Jul 14 at 3:42

2 Answers 2

up vote 1 down vote accepted 
char array[256];

...

int i;
for( i=0; i<256;i++ ) {
    array[i] = 0x00;
}
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up vote 1 down vote

There is a single-line command you can use:

memset(array, 0, 256);
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Or memset(array, 0, sizeof array); preferably. –  Nick Gammon Jul 14 at 22:05
1  
@NickGammon Assuming you are using "array" directly, and not in a function which has a pointer passed to it. Better is to use a #define or a const int for both the array size and the memset length. –  Majenko Jul 14 at 22:34
    
Quite right, for a pointer that is correct. –  Nick Gammon Jul 14 at 23:56

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