How do I clear a C array

Question

How do I clear empty a C   array  Theres array  fill  but looks like its C  11 only  I am using VC   2010  How do I empty it  reset to all 0

User · Answer

Hey i think The fastest way to handle that kind of operation is to memset() the memory.

Example-

memset(&myPage.pageArray[0][0], 0, sizeof(myPage.pageArray));

A similar C++ way would be to use std::fill

char *begin = myPage.pageArray[0][0];
char *end = begin + sizeof(myPage.pageArray);
std::fill(begin, end, 0);

User · Answer

Assuming a C-style array a of size N  with elements of a type implicitly convertible from 0  the following sets all the elements to values constructed from 0   std  fill a  a N  0     Note that this is not the same as  emptying  or  clearing    Edit  Following james Kanze s suggestion  in C  11 you could use the more idiomatic alternative  std  fill  std  begin  a    std  end  a    0      In the absence of C  11  you could roll out your own solution along these lines   template  lt typename T  std  size t N gt  T  end  T  amp arr  N     return arr   N     template  lt typename T  std  size t N gt  T  begin  T  amp arr  N     return arr     std  fill  begin   a    end   a    0

User · Answer

If only to 0 then you can use memset   int  a   new int 6    memset a  0  6 sizeof int

User · Answer

std  fill n array  elementCount  0     Assuming array is a normal array  e g  int

User · Answer

Should you want to clear the array with something other than a value  std  file wont cut it  instead I found std  generate useful  e g  I had a vector of lists I wanted to initialize  std  generate v begin    v end            return std  list lt X gt           You can do ints too e g   std  generate v begin    v end     n   0     mutable   return n          or just  std  generate v begin    v end           return 0        but I imagine std  fill is faster for the simplest case

User · Answer

std  fill a begin   a end   0

[c++] How do I clear a C++ array?

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