Digital currency VF

1.

1. MS indicates that it has not been circulated and is close to the factory status, and the corresponding score is 60-70 points

2. Au indicates that it is nearly unused and belongs to American procts, with corresponding scores of 50, 53, 55 and 58

3. XF indicates that the procts in circulation are more clear and beautiful, which belong to the top grade, with corresponding scores of 40 and 45

4. VF refers to general circulation procts, with corresponding scores of 30 and 35. No more points below 30. Just write "f real" or "real". All comments and scores do not represent the variety and rarity of the coin, but only the appearance of the coin

extended data:

proct phase is related to the maximization of appreciation effect and future value preservation and appreciation of banknotes. Therefore, as long as the circulation time, release time, variety and many other aspects as the premise, the pursuit of perfect appearance is always correct

for example, it is very reasonable to put forward higher requirements for the appearance of modern banknotes that have been collected for less than 30 years, because their issuing and circulation time is relatively short, even if the rating of the banknotes is 67 points (superb gem UNC)

but if we only pursue the highest regardless of varieties, I'm afraid we will have to ignore one and lose the other and miss some very good varieties. For example, some old French banknotes, I'm afraid the Au (nearly brand new) or XF (extremely beautiful) procts are already the highest procts. If you want to collect rare varieties, I'm afraid that as long as the thinking of top-notch procts is not in line with the actual situation

2. Super score

every coin should be inspected by every appraiser once, and then each appraiser will classify each coin into a systematic level. The currency rating standard adopted by NGC is widely accepted by the coin instry all over the world. The following table is the description of currency rating:

prefix

numerical grade

descriptive description

MS

60 – 70


Mint State (uncoirculated) is not in circulation
Au

50, 53, 55, 58

about uncontrolled is between non circulation and circulation
XF

40, 45

extremely fine
VF

20, 25, 30, 35

very fine
F

12, 15

fine
VG

8, 10

very good
G

4, 6

good
Ag

3

about good
FA


2

fair general
PR

1
poor


NGC will be responsible for the surface condition (phase) problems (defects) The coins will be packaged with "details grading" rating. The coins will be packaged in a purple holder. The label will indicate the description of the surface condition and the grade corresponding to the wear degree of the coins, Some of the descriptions are explained in Chinese as follows:

Artificial oxidation
chopmarks stamp

corrosion
environmental damage

improper cleaning
rim damage
scratches
stained
surface hairlines scratches
whi Some coins can not be digitally rated or packaged, for example, coins that have been seriously damaged or badly cleaned will not be certified by NGC, and then they will be returned to the applicant in a plastic box with the reasons for refusing to package. NGC's experienced experts can accurately screen coins that cannot be certified, Some of the descriptions in Chinese are explained as follows:

authenticity unverifiable can't identify
non eligible types
not genuine (counterfeit currency)
PVC
questionable authen

NGC will carry out "details grading" rating package for coins with surface condition (appearance) problems (defects), The coins will be enclosed in a purple holder with a description of the surface condition and a rating corresponding to the degree of wear, Some of the descriptions are explained in Chinese as follows:

Artificial oxidation
chopmarks stamp

corrosion
environmental damage

improper cleaning
rim damage
scratches
stained
surface hairlines scratches
whi Some coins can not be digitally rated or packaged, for example, coins that have been seriously damaged or badly cleaned will not be certified by NGC, and then they will be returned to the applicant in a plastic box with the reasons for refusing to package. NGC's experienced experts can accurately screen coins that cannot be certified, Some of the descriptions in Chinese are explained as follows:

authenticity unverifiable can't identify
non eligible types
not genuine (counterfeit currency)
PVC
questionable authen

NGC will carry out "details grading" rating package for coins with surface condition (appearance) problems (defects), The coins will be enclosed in a purple holder with a description of the surface condition and a rating corresponding to the degree of wear, Some of the descriptions are explained in Chinese as follows:

Artificial oxidation
chopmarks stamp

corrosion
environmental damage

improper cleaning
rim damage
scratches
stained
surface hairlines scratches
whi Some coins can not be digitally rated or packaged, for example, coins that have been seriously damaged or badly cleaned will not be certified by NGC, and then they will be returned to the applicant in a plastic box with the reasons for refusing to package. NGC's experienced experts can accurately screen the coins that cannot be authenticated. Some of the descriptions are explained in Chinese as follows:

authenticity unverifiable
non eligible types
not genuine (counterfeit)
PVC
questionable

3.

Coin rating is the process of determining the degree of old and new of a coin, which is a rather subjective process. Traditionally, people often use vague words such as "good" and "good" to describe the appearance of a coin

because the old and new degree of coins has a great influence on the value of currency, the simple lack of standardized description of coins is obviously not concive to the market transaction of collected coins. After long-term development, people have graally established a set of relatively objective and standardized coin rating standards, which originated in the United States and has been widely promoted all over the world

extended materials:

collection value:

I. China's first series of rated banknotes. China's first full set of RMB rated banknotes

since 1948, the people's Bank of China issued the first set of RMB, so far it has issued five sets of RMB. The fourth set of graded banknotes is the first series of graded banknotes since the founding of new China. There are nine denominations ranging from 10 cents to 100 yuan

At the same time, the fourth set of RMB rated banknotes is the only collection of banknotes issued in the form of rating, which is the most authoritative and influential variety of banknotes at present, and has extraordinary significance in the history of Chinese currency issuance

Second, to commemorate the 30th anniversary of the circulation of the fourth set of RMB

it has been 30 years since the fourth set of RMB came out. With the improvement of people's living standards, the use of small banknotes has decreased, and the loss rate is higher. However, e to the accelerated use of large banknotes, the wear and tear is serious, and new banknotes or banknotes with good quality are rare

and the fourth set of RMB rated banknote collection conforms to the current situation and solves the huge market demand of less genuine and better procts. The people's Bank of China specially issues the fourth set of RMB rated banknote collection to commemorate the 30th anniversary of RMB circulation

4. Just like the literal meaning, when you dig the ground with a hoe in the mine, you will dig out the stairs in one of the positions and go down to the next floor

5. There are 255 floors in total, but there is a certain probability that there will be no next floor stairs on each floor. Therefore, a file should be saved next to the stairs on each floor. If there are no stairs on the next floor, You need to read the file
the following are the things you can dig and the number of floors:
the number of floors of Moonstone 8 is 255
the number of floors of desert rose stone 9 is 255
pink diamond 30 70 90 110 130 190 210 230 240 250 ~ 255
Alexandrite 50 100 150 200 210 230 240 250 ~ 255
diamond 10 20 30 70 90 110 130 170 190 201 ~ 255
Emerald The number of layers with single digit 5 is 40 60 80 120 140 160 180 201 ~ 255
the number of layers beyond Ruby 50 100 150 200
the number of layers beyond Topaz 50 100 150 200
the number of layers beyond olivine 50 100 150 200
the number of layers beyond fluorite 50 100 150 200
the number of layers beyond agate 50 100 150 200
the number of layers beyond Amethyst 50 100 150 200
the number of layers above Hetong jade 1 40 60 80 120 140 160 180 255 the jade of Hetong can be changed to the secret treasure of Hetong
all layers of black grass
all layers of waste ore
there is a lake in layer 9. After catching other fish kings, you can catch the powerful fruit in layer 19 of the earth of the final fish king, After all the farm tools have been transformed into Mithril level, there are farm tools with the same curse level in the soil of layers 29, 39, 49, 59, 69 and 79 in Hu mine cave (if there is a chance, they should be archived before going down to the corresponding layers)
it is recommended to take a bamboo basket and fill the bag with "recovery grass", Before entering the mine, you can find a fruit of strength on the back of the entrance of the mine.
the materials for cooking "winter sun" are diamond + emerald + Moonstone + desert rose stone + pink diamond + Alexandrite + Sage stone, among which diamond, emerald, moonstone, desert rose stone, pink diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red diamond, red Alexandrite was found in the Lake mine

6. The first step is to learn to use the S / L method. What is the S / L method? It's save / load. There are two files in the diary that can be saved. It's more convenient to use instant archiving
first of all, when entering the mine cave, save it to file 2. Then hit the stone hoe, hoe to the stairs, write down the location. Read file 2, go directly to the place where you hoed the stairs just now, and see the stairs with a hoe. File to file 1 before you go downstairs
go down the stairs and save to file 2 immediately. Hit the stone and hoe the ground, hoe to the stairs, write down the position. Read file 2, go directly to the place where you hoed the stairs just now, and see the stairs with a hoe. File to file 1 before you go downstairs
go downstairs again, just like the above steps, and so on
there is a certain probability that there will be no stairs, which is very normal. If you encounter it, read file 1 and go down the stairs again. If you don't use s / L Dafa, hehe, when this happens, you can only cry without tears
Mining only takes hammers and hoes. When you go down to a certain level in the mine, you can determine whether there are stairs and where they are. The location of ore and black grass is also fixed, but the location of the secret treasure is random, not every time

when you dig the black grass, please remember the location. When you dig the stairs directly, you should also dig out the black grass to eat (each black grass + 5 physical strength, - 5 fatigue)
when you are not ready for cooking, go to the hospital to buy physical strength medicine and fatigue medicine. It is suggested that if you are deep seated, there are 5 strong strength medicine and 3 strong fatigue medicine

every next floor takes one minute, so don't go at night

black grass must be eaten.

7. In fact, monetary data is used as numerical data, so it is not necessary to define it. It is convenient to use it directly as numerical data.

8. When a currency type field receives the value or constant of a variable, there are the following situations:
1. If the source is a numeric type, it will be placed directly without any conversion< Second, if the source is a character type, it is like this:
the number character starts, intercepts to the non number character, even if there is a number character after the non number character, and then converts the intercepted string into a number type and puts it into the file
if it starts with a non numeric character, zero will be placed
thirdly, if the source is other, such as logical type, date type and so on, it will not be converted and put in
no matter what, there will be no type discrepancy

from this point of view, I speculate that the price field of your table is not a currency field, but a number field
if you want to put data in a numeric field, it must be numeric. If not, it must be converted to numeric in advance. Otherwise, there will be prompts such as type discrepancy

note: this conjecture is obtained by using the gather memvar statement in vfp9.0.

9. If you are comparing the size of values, you can first convert them to numeric type, and then convert them to character type after comparison. See below:

str()
returns the string corresponding to the specified numeric expression
str (nexpression [, Nlength [, ndecimalplaces])
parameter
nexpression
specifies the numeric expression to be evaluated by str()
Nlength
specifies the length of the string returned by str(). If Nlength is omitted, Nlength defaults to 10 characters. Note:
if the expression contains a decimal point, the length includes the characters occupied by the decimal point and the characters occupied by each digit to the right of the decimal point
ndecimalplaces
specifies the number of decimal places in the string returned by str(). To specify the number of decimal places with ndecimalplaces, you must also include Nlength. If ndecimalplaces is omitted, the default decimal place is zero (0). Note:
Visual FoxPro contains the limitation of 16 bit precision in numerical calculation. For more information about the numerical accuracy of Visual FoxPro, see Visual FoxPro system capacity
return value
character type. Str() returns the string corresponding to the specified numeric expression

val()
returns a numeric or monetary value from a numeric character expression. You can use val() to convert a string returned from the Visual FoxPro sys() function to a numeric value
val (coexpression)
parameter
coexpression
specifies a character expression composed of 16 digits. If more than 16 digits, it will be rounded. If the first character of coexpression is a dollar sign ($), Val () returns a monetary value. In all other cases, Val () returns a numeric value
return value
numeric or monetary. Val() returns a character expression from left to right until a non numeric character is encountered. The preceding spaces are ignored. If the first character of a character expression is not a numeric value, the dollar sign ($), plus sign (+) or minus sign val() returns 0. You can control the result of val() by issuing the set details command before using the val() function.

10. Input mask:
can determine the format of field input
shield illegal input, rece artificial data input error
common input mask:
x-means any character can be input
9 -- indicates that you can enter numbers and positive and negative symbols
# - indicates that you can enter numbers, spaces and positive and negative symbols
$-- indicates that the current currency symbol is displayed at a fixed position
$$-- indicates to display the current currency symbol
* -- indicates that an asterisk is displayed on the left side of the value
. -- indicates the decimal point position of the value specified by the point separator
, - indicates to separate the integer part to the left of the decimal point with a comma, which is generally used to separate the thousandths.