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

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100 S = 5
110 S2 = S ^ 2 : REM SQUARED
120 H = S2 / 2 : REM HALFWAY
130 S2 = S2 - 1
140 DX = 1 : REM INITIAL
150 DY = 0 : REM DIRECTION
160 N = S - 1
170 DIM A%(N, N)
200 FOR I = 0 TO H
210 A%(X, Y) = I
220 A%(N - X, N - Y) = S2 - I
230 X = X + DX
240 Y = Y + DY
250 IF Y = 0 THEN DY = DY + 1 : IF DY THEN DX = -DX
260 IF X = 0 THEN DX = DX + 1 : IF DX THEN DY = -DY
270 NEXT I
300 FOR Y = 0 TO N
310 FOR X = 0 TO N
320 IF X THEN PRINT TAB(X * (LEN(STR$(S2)) + 1) + 1);
330 PRINT A%(X, Y);
340 NEXT X
350 PRINT
360 NEXT Y