initialize a multidimensional C array of variable size to zero

Question

I want to initialize a two-dimensional array of variable size to zero. I know it can be done for a fixed-sized array:

int myarray[10][10] = {0};

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Answer 1

You cannot initialize it with an initializer, but you can memset() the array to 0.

#include 

int main(void) {
  int a = 13, b = 42;
  int m[a][b];
  memset(m, 0, sizeof m);
  return 0;
}

Note: this is C99. In C89 the declaration of m ( int m[a][b]; ) is an error.