| math function | ||
|---|---|---|
| function | illustrate | example |
| Without(N) | Returns the sine of the argument N | Sin(0)=0 N is radians |
| Cos(N) | Returns the cosine of the argument N | Cos(0)=1 N is radians |
| So(N) | Returns the tangent of the argument N | Tan(0)=0 N is radians |
| Atn(N) | Returns the arctangent of the argument N | Atn(0)=0 function value is radian |
| Sgn(N) | Return the sign of the argument N (N<0, return -1 N=0, return 0 N>0, return 1) |
Sgn(-35)=-1 Sgn(0)=0 Sgn(35)=1 |
| Abs(N) | Returns the absolute value of the argument N | Abs(-3.5)=3.5 |
| Sqr(N) | Returns the square root of the argument N, N≧0 | Sqr(9)=3 |
| Exp(N) | Return the Nth power value of e, N≧0 | Exp(3)=20.0855369231877 |
| Log(N) | Returns the natural logarithm of N, N>0 | Log(10)=2.3 |
| Int(N) | Returns the largest integer not greater than N | Int(3.6)=3 Int(-3.6)=-4 |
| Fix(N) | returns the integer part of N | Fix(-3.3)=-3 Fix(3.6)=3 |
| Belt(s) | Returns the rounded integer of N | Cint(3.6)=4 |
| Rnd[(N)] | Returns a random decimal number between 0 and 1 | |
| Round(N1,N2) | Round N1 by N2 decimal places. If N2 is omitted, N1 will return an integer | Round(4.844)=5 Round(5.7383,3)=5.738 |
| Note: Distinguish the similarities and differences of partition integer Int(), Fix() and Round(). | ||
| conversion function | ||
|---|---|---|
| function | illustrate | example |
| Asc(X$) | Returns the ASCII code value of the first character of X$ | Asc("abc")=97 |
| Chr$(X) | Convert the value of X to the corresponding ASCII character | Chr(97)="a" |
| Hex$(X) | Convert the decimal number X to hexadecimal, which is a numeric string | Hex(65535)=5 |
| Oct$(X) | Convert the decimal number X to octal, which is a numeric string | Oct(65535)=177777 |
| Str$(X) | Convert the value of X to a string | Str(100)="100" |
| UCase$(X) | Convert lowercase letters in X values to uppercase letters | UCase("aBcDefg")="ABCDEFG" |
| LCase$(X) | Convert uppercase letters in X values to lowercase letters | LCase("aBcDefg")="abcdefg" |
| Val(X) | Converts the numeric string X to a numeric value | Val("123")=123 |
| IsNumeric(X$) | Return True if X$ is a numeric string | IsNumeric("abc")=False |
| CInt(X) | Round the decimal part of X and convert it to an integer | CInt(-3.64)=-4 |
| CCur(X) | Convert the value of X to a currency type value, with up to 4 decimal places and automatic rounding | CCur(3.1236568)=3.1237 The converted 3.1237 is the currency type |
| CDbl(X) | Convert the X value to a double precision number | CDbl(1.2345678!)=1.2345677614212# |
| CLng(X) | Round off the decimal part of X and convert it to a long integer | CL of(1234.5678)=1235 |
| CSng(X) | Convert the X value to a single precision number | CSng(1.2345677614212)=1.234568 |
| CVar(X) | Converts an X value to a Variant type value | a$=CVar(123) b$="abc"+a$ ?b$ "abc123" |
| 注意：Str()函数将非负数值转换成字符类型，会在转换后的字符串左边增加空格，即数值的符号位。例如表达式："abc"+Str(123)的结果为"abc 123"而不是"abc123"。 Val()将数字字符串转换为数值类型，当字符串中出现数值类型规定的字符外的字符，则停止转换，函数返回的是停止转换前的结果。例如表达式：Val("-123.45ty")的结果为- 123.45；而表达式Val(-123.45E3)结果为123450，因为此时E是指数符号。 |
||
| 字符串函数 | ||
|---|---|---|
| 函数 | 说明 | 示例 |
| LTrim$(C$) | 去掉C$左边的空白字符 | LTrim$(" abc")="abc" |
| RTrim$(C$) | 去掉C$右边的空白字符 | RTrim$("abc ")="abc" |
| Trim$(C$) | 去掉C$两边的空白字符 | Trim$(" abc ")="abc" |
| Left$(C$,n) | 取C$字符串左部的n个字符 | Left$("abc",2)="ab" |
| Right$(C$,n) | 取C$字符串右部的n个字符 | Right$("abc",2)="bc" |
| Mid$(C$,p,n) | 从位置p开始取C$字符串的n个字符 | Mid$("abcdefg",3,3)="cde" |
| Len(C$) | 返回C$字符串的长度 | Len("VB 程序设计")=6 |
| LenB(C$) | 返回C$字符串的字节数 | LenB("VB 程序设计")=12 LenB(StrConv("中国人123", vbFromUnicode))=9 |
| String$(n,C$) | 返回由C$首字符组成的字符串，字符串长度为n | String$(2,"abc")="aa" |
| Space$(n) | 返回n个空格 | Space$(3)=" " |
| InStr([n,]C1$,C2$[,M]) InStrRev |
在C1中从n开始找C2，查到返回位置，否则返回0。省略n表示从头开始找，M表示是否区分大小写。 | InStr(2,"abce","bc")=2 InStr(2,"abce","d")=0 |
| Join(A[,D]) | 将数值A各元素按D(或空格)分隔符连接成字符串变量 | A=array("123","BC","c") Join(A,"")=123BCc |
| Replace$(C$,C1$, C2$[,N1][,N2][,M]) |
在C字符串中从1(或N1)开始将C2替代C1(有N2，替代N2次) | Replace$("abcdabcd","cd","123") ="ab123ab123" |
| 日期函数 | ||
|---|---|---|
| 函数 | 说明 | 示例Now |
| Now | 返回系统当前的日期和时间 | Now=2021/9/6 星期一 19:23:03 |
| Date | 返回低当前的日期 | Date=2021/9/6 星期一 |
| Time | 返回系统当前的时间 | Time=17:20:18 |
| Day(Now) | 返回当前的日(1-31) | Day(Now)=8 |
| WeeDay(Now) | 返回当前星期的第几天 | WeekDay(Now)=7 |
| Month(Now) | 返回当前的月份(1-12) | Month(Now)=6 |
| Year(Now) | 返回当前的年份 | Year(Now)=2022 |
| Hour(Now) | 返回小时(0-23) | Hour(Now)=17 |
| Minute(Now) | 返回分钟(0-59) | Minute(Now)=20 |
| Second(Now) | 返回秒(0-59) | Second(Now)=1 |