How to initialize array to 0 in C

Question

I need a big null array in C as a global  Is there any way to do this besides typing out  char ZEROARRAY 1024     0  0  0         1021 more times

User · Answer

If you d like to initialize the array to values other than 0  with gcc you can do   int array 1024        0     1023     -1      This is a GNU extension of C99 Designated Initializers  In older GCC  you may need to use -std gnu99 to compile your code

User · Answer

Global variables and static variables are automatically initialized to zero  If you have simply  char ZEROARRAY 1024     at global scope it will be all zeros at runtime  But actually there is a shorthand syntax if you had a local array  If an array is partially initialized  elements that are not initialized receive the value 0 of the appropriate type  You could write   char ZEROARRAY 1024     0     The compiler would fill the unwritten entries with zeros  Alternatively you could use memset to initialize the array at program startup   memset ZEROARRAY  0  1024     That would be useful if you had changed it and wanted to reset it back to all zeros

[c] How to initialize array to 0 in C?

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