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Commands - 71
MID$
String Statement
SYNTAX: MID$(a$,s [,n]) = b$
PURPOSE: To replace a portion of one string with another.
REMARKS: A common usage for the MID$ statement is in networking protocols. The network commands are
standard strings defined by string variables.
Using the MID$ statement to modify these strings is much faster than other string methods.
The string a$ is the target string, while b$ is the replacement string.
The parameter s is the starting point within a$ where b$ will be inserted. The optional parameter n
indicates how many characters of b$ are to be used. When n is omitted, all of b$ is used.
If b$ is longer than a$, replacement will not exceed the length of a$. No error message will be
given.
RELATED: LEFT$, LEN, RIGHT$, INSTR, MID$ Function
EXAMPLE: 10 F$ = "Hopeless"
20 R$ = "Help"
30 MID$(F$,1) = R$
40 PRINT F$
Helpless
The example below is for a communications protocol. Note that the escape character is not a
printable character.
10 CV$=CHR(27) + "A" + "12"
20 MID$(CV$,3) = "23"
30 PRINT CV$
ESC A23
ERROR: <Data negative>– for s and n
<Data out of range> – if s = 0
<Data > 255> – for s and n
- COPYRIGHT 1
- TRADEMARKS 1
- HOW TO USE THIS MANUAL 2
- PRODUCT SUPPORT 3
- ABOUT CAMBASIC 4
- Getting Started 7
- Line Format 7
- Line Renumbering 7
- Line Labels 8
- Debugging 8
- Bit Manipulation 8
- Communications Ports 8
- Real time Multitasking 9
- Reserved Words 9
- Character Set 9
- 10 ON KEYPAD$ GOSUB 50 11
- 10 . . 12
- 10 DIM G$(100) 14
- 10 DIM TEMP(20,20) 14
- Expression Evaluation 17
- CAMBASIC EDITOR 19
- LINE EDITING COMMANDS 20
- Other Tips 24
- 10 IF A=1.23 THEN 100 25
- 10 IF A=>1.23 THEN 100 25
- PRINT ABS(7) 31
- PRINT ABS(–7) 31
- 10 F$ = "Alert" 34
- 20 PRINT ASC(F$) 34
- A = BIN(B) 37
- PRINT INP(&18) 37
- PRINT BIN(INP(&18)) 37
- PRINT BIN$(199) 38
- 11000111 38
- PRINT CHR$(65) 43
- PRINT CHR$(36,10) 43
- $$$$$$$$$$ 43
- 10 CLEAR 500 44
- 10 CLEAR 44
- CLEAR COM$ 45
- CLEAR COUNT 46
- CLEAR TICK 47
- CLEAR PULSE 48
- 10 FOR X = 0 TO 7 54
- 20 A(X) = COUNT(X) 54
- 10 A$ = "01-15-91" 56
- 20 DATE$ = A$ 56
- 20 PRINT DATE$(0) 57
- 30 PRINT DATE$(1) 57
- 02-11-91 57
- DEC & DECF 58
- DEL 10 Deletes line 10 59
- 10 DELAY .5 delays 1/2 second 60
- 10 DIM A(25), A$(30) 61
- 20 DIM B(10,10,10) 61
- Commands - 34 64
- DO/UNTIL 65
- DPEEK and DPOKE 66
- 10 GOSUB 50 68
- 50 PRINT "END"; 68
- 60 RETURN 68
- EXIT and EXIT CLEAR 72
- 10 PRINT EXP(1),EXP(2) 73
- 2.71828 7.38906 73
- Commands - 45 75
- FOR / NEXT / STEP 76
- FPEEK and FPOKE 77
- PRINT FRE(0) ; FRE(A$) 78
- 35210 100 78
- CLEAR 1000 78
- 34310 1000 78
- PRINT HEX$(127) 81
- PRINT HEX$(1280) 81
- IF / THEN / ELSE 82
- INC and INCF 83
- 10 A$ = INKEY$(1) 84
- 50 GOTO 10 84
- INP and OUT 85
- Input pH, volume? _ 86
- INPUT KEYPAD$ 87
- 10 A$="BOOHOO" 89
- 20 B$="HOO" 89
- 30 PRINT INSTR(1,A$,B$) 89
- PRINT INT(45.67) 90
- PRINT INT(–15.02) 90
- A=INT(B+0.5) 90
- 10 A$ = "Hopeless" 92
- 20 B$ = LEFT$(A$,4) 92
- 30 PRINT B$ 92
- 20 PRINT LEN(A$) 93
- 10 OUT 0,1 94
- 20 PRINT LINE(119) 94
- 10 LINE 113,ON 95
- 20 PRINT LINE(113) 95
- LOCK and UNLOCK 98
- PRINT LOG(45/7) 99
- 10 A$ = "ABCDEFG" 100
- 20 PRINT MID$(A$,5,2) 100
- NEW and UNNEW 104
- 200 ON R GOTO 150,300,320,390 105
- ON COUNT 108
- ON ERR GOTO 109
- ON KEYPAD$ 112
- 20 PRINT OPTO(0) 114
- 10 OPTO 3,ON 115
- 20 PRINT OPTO(103) 115
- PEEK and POKE 116
- PEEK$ and POKE$ 117
- PRINT USING 120
- 10 A=PULSE(2) 123
- PULSE 5,48,2,2.55,1 124
- 10 FOR X = 1 TO 9 125
- 20 READ A(X) 125
- RENUM 300,50 127
- RENUM 1000,1,20 127
- RESUME COUNT 130
- 10 ON ITR 0 GOSUB 40 131
- 30 GOTO 20 131
- 50 RETURN ITR 0 131
- 20 PRINT RIGHT$(A$,3) 132
- 10 PRINT 7/1 134
- 20 PRINT "HELLO" 134
- PRINT SIN(1.5) 136
- START BIT 137
- START COUNT 138
- START INP 139
- STOP BIT 141
- STOP COUNT 142
- STOP INP 143
- PRINT SYS(2)–SYS(1) 145
- 20 A = PEEK(N) 146
- 30 PRINT N,A,CHR$(A) 146
- 10 PRINT TAN(1.5) 148
- 10 CLEAR TICK 2 149
- 20 FOR X=0 TO 5000 : NEXT 149
- 30 PRINT TICK (2) 149
- 20 PRINT TIME$(0) 150
- 30 PRINT TIME$(1) 150
- 11:23:45 150
- 10 A$ = “01:45:12" 151
- 20 TIME$ = A$ 151
- TRON/TROFF 152
- CONFIG BAUD 156
- 10 CONFIG BAUD 1,6,5,0 157
- CONFIG BREAK 158
- CONFIG CLOCK 159
- CONFIG COM$ 160
- CONFIG COUNT 161
- CONFIG DISPLAY 162
- 163
- CONFIG Commands - 8 163
- CONFIG PIO 164
- PROGRAM DEBUGGING 165
- 90 INC H 166
- 100 RETURN 166
- Event Multitasking 170
- COM$ TASKING 171
- COUNT MULTITASKING 171
- INP TASKING 176
- KEYPAD MULTITASKING 177
- Applications Examples 178
- 250 RETURN 180
- 30 INPUT KEYPAD$ 1,A$ 180
- 40 PRINT A$ 180
- MULTITASKING ON A CLOCK TICK 181
- PULSE MULTITASKING 182
- THE CAMBASIC MINI–MONITOR 185
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