RosettaCodeData/Task/Zig-zag-matrix/IS-BASIC/zig-zag-matrix.basic

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100 PROGRAM "ZigZag.bas"
110 LET SIZE=5
120 NUMERIC A(1 TO SIZE,1 TO SIZE)
130 LET I,J=1
140 FOR E=0 TO SIZE^2-1
150 LET A(I,J)=E
160 IF ((I+J) BAND 1)=0 THEN
170 IF J<SIZE THEN
180 LET J=J+1
190 ELSE
200 LET I=I+2
210 END IF
220 IF I>1 THEN LET I=I-1
230 ELSE
240 IF I<SIZE THEN
250 LET I=I+1
260 ELSE
270 LET J=J+2
280 END IF
290 IF J>1 THEN LET J=J-1
300 END IF
310 NEXT
320 FOR ROW=1 TO SIZE
330 FOR COL=1 TO SIZE
340 PRINT USING " ##":A(ROW,COL);
350 NEXT
360 PRINT
370 NEXT