Memset matrix test. memset when using the size of the matrix, change the values in all dimensions.

memset-matrix-test.cpp

#include <stdio.h> // for printf
#include <cstring> // for memset

int main(int argc, char *argv[])
{
	int xx[2][2] = {{1,1},{2,2}};
	printf("{{%d,%d},{%d,%d}}\n", xx[0][0], xx[0][1], xx[1][0], xx[1][1]);
	
	memset(xx, 0, sizeof(xx)); // change to {{0,0},{0,0}}
	printf("{{%d,%d},{%d,%d}}\n", xx[0][0], xx[0][1], xx[1][0], xx[1][1]);
	
	return 0;
}