Programming Manual for Citizen BASIC Interpreter - MaRCo

Citizen BASIC Interpreter
Contents
1. BASIC Interpreter Environment ....................................6
1.1 Overview .......................................................6
1.2 Start Basic Interpreter ........................................6
1.3 BASIC Interpreter Mode .........................................6
1.4 End BASIC Interpreter..........................................7
1.5 Example of BASIC Program .......................................7
2. BASIC Language ...................................................9
2.1 Syntactic Element..............................................9
2.1.1 Basic Syntactic Element ....................................9
2.1.2 Identifier .................................................9
2.1.3 Reserved Word .............................................10
2.1.4 Numeral ...................................................10
2.1.5 Line Number ...............................................11
2.1.6 String ....................................................11
2.2 Formula.......................................................11
2.2.1 Operator ..................................................11
2.2.2 Arithmetic Operator .......................................12
2.2.3 Logic Operator ............................................12
2.2.4 Logic Operator (Bit Operator) .............................12
2.2.5 String Operator ...........................................13
2.2.6 Relational Operator .......................................13
2.2.7 Priority of Operator ......................................13
2.2.8 Function Call .............................................14
2.3 Statement .....................................................14
2.3.1 Assignment Statement ......................................14
2.3.2 Function Call .............................................14
2.3.3 GOTO Statement ............................................14
2.3.4 Structured Statement ......................................15
2.3.5 IF Statement ..............................................15
2.3.6 Control Loop ..............................................16
2.3.7 REPEAT Statement ..........................................16
2.3.8 WHILE Statement ...........................................16
2.3.9 DO Statement ..............................................17
2.3.10 FOR Statement ............................................17
2.4 Data Type and Variable ........................................18
2.4.1 Type ......................................................18
2.4.2 Integer Type ..............................................18
2.4.3 String Type ...............................................18
2.4.4 Array Type ................................................18
2.5 Variable ......................................................19
2.5.1 Variable Declaration ......................................19
2.6 Constant ......................................................19
2.6.1 Integer Type Constant .....................................19
2.6.2 String Type Constant ......................................19
2.7 Function ......................................................19
3. Command .........................................................19
3.1 File Name .....................................................20
3.1.1 Program Store Drive .......................................20
3.1.2 File Name Convention ......................................20
3.2 Input-Output Device ...........................................20
3.2.1 List of Devices ...........................................20
3.2.2 Console Device ............................................20
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