Programming Manual for Citizen BASIC Interpreter - MaRCo

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Citizen BASIC Interpreter 1020 C=C+1 1030 GOTO 1010 1040 STOP 1050 PRINT "FINISH" 2000 END Ready >RUN Stopped at line 1040 Ready >RESTART FINISH Ready 3.10.4 IF Statement 【Explanation】 Judging the conditional expression, this statement executes the statement with the THEN clause if it is true, and that with the ELSE clause if false. 【Format】 IF conditional expression THEN{ statement| line number} [ELSE{ statement| line number}] When designating a line number to the THEN or ELSE clause, jump to the line. The ELSE clause can be omitted. When the ELSE clause is omitted and the conditional expression is false, then the execution moves to the next line. 【E.g.】 1010 IF C=10 THEN GOTO 1040 If the value of the variable C is 10, jump to the line number 1040. 1010 IF C=127 THEN C=32 if the value of the variable C is 127, rewrite it to 32. 3.10.5 Structured IF Statement 【Explanation】 Judging the conditional expression, this statement executes the statement with the THEN block if the result is true, and that with the ELSE block if false. After the THEN and ELSE blocks are executed, start execution subsequent to ENDIF. 【Format】 IF conditional expression THEN Statement [ELSE IF conditional expression THEN Statement] [ELSE Statement] END IF ELSE and ELSE IF clauses can be omitted. 【E.g.】 1000 INPUT "(XX)";A$ 1010 IF MID$ (A$,1,1 )="0" THEN 1020 PRINT 0; 1030 IF MID$ (A$,2,1 )="0" THEN 1040 PRINT 0; 1050 ELSE 1060 PRINT 1; 1070 END IF 1080 PRINT "-"; 30
Citizen BASIC Interpreter 1090 ELSE 1100 PRINT 1; 1110 IF MID$ (A$,2,1 )="0" THE3 1120 PRINT 0; 1130 ELSE 1140 PRINT 1; 1150 END IF 1160 PRINT "*"; 1170 END IF 1180 PRINT 3.10.6 FOR – NEXT Loop 【Explanation】 This loop executes the lines from the FOR statement to the NEXT statement by repeating them several times. Firstly assign the initial value to the variable. Then, execute the statements in the FOR loop. If in the NEXT statement the variable exceeds the final value, execution moves to the one next to the NEXT statement.If not, add the increment value to the variable to once again execute the statements within the FOR loop. Repeating these, execute the statements within the FOR loop the designated number of times repeatedly. 【Format】 FOR variable =initial value TO final value [STEP increment value] Statement NEXT variable When the STEP clause is omitted, the increment becomes 1. 【Parameter】 Initial Initial value to assign to the variable value: Final value: Conditional value for exiting the FOR loop Increment value: 【E.g.】 >LIST 1000 T=0 1010 FOR C=1 TO 10 1020 T=T+C 1030 NEXT C 1040 PRINT T Ready >RUN 55 Ready When the variable exceeds the final value, it exits the FOR loop. Increment value for incrementing the value of the variable in the NEXT statement The sum from 1 to 10 is calculated. 3.10.7 REPEAT Statement – UNTIL Loop 【Explanation】 These execute the lines from the REPEAT statement to the UNTIL statement until the conditional expression becomes true. 【Format】 REPEAT Statement 31
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