C语言中动态二维数组的创建

int** adjacentMatrix;
adjacentMatrix = (int**)malloc(sizeof(int*) * (network_size + 1));
	if( !adjacentMatrix )
	{
		printf("malloc main is error!");
		exit(0);
	}
	int i;
	for( i = 1; i <= network_size; i++ )
	{
		adjacentMatrix[i] = (int*)malloc(sizeof(int) * (network_size + 1));
		if( !adjacentMatrix[i] )
		{
			printf("malloc %d is error!
", i);
			exit(0);
		}
	}