Rosetta Floyd triangle

[B+]

An example of recursive code:
CALL floyd 20 'floyd.txt for JB v2.0 B+ 2018-10-17 another Rosetta Challenge
SUB floyd row
   LOCATE 1, row
   FOR i = ((row - 1) * row) / 2 + 1 TO row * (row + 1) / 2
       PRINT RIGHT$("   " + STR$(i), 4);
   NEXT
   PRINT
   IF row > 1 THEN CALL floyd (row - 1) '< this makes the routine recursive, it calls itself and continues to do so while row > 1
END SUB


Output:

  1
  2   3
  4   5   6
  7   8   9  10
 11  12  13  14  15
 16  17  18  19  20  21
 22  23  24  25  26  27  28
 29  30  31  32  33  34  35  36
 37  38  39  40  41  42  43  44  45
 46  47  48  49  50  51  52  53  54  55
 56  57  58  59  60  61  62  63  64  65  66
 67  68  69  70  71  72  73  74  75  76  77  78
 79  80  81  82  83  84  85  86  87  88  89  90  91
 92  93  94  95  96  97  98  99 100 101 102 103 104 105
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210


[B+]

Dang! I missed the Rosetta spec about spacing. That makes it more tricky.

[B+]

Aha! John at All BASIC has a good version!


' "Floyd John's version" ' from All BASIC 2018-10-17 looking pretty good!"
l = 14 'number of rows for Floyd to process
n = 1 ' number increment
FOR r = 1 TO l
   FOR c = 1 TO r
       PRINT RIGHT$("    " + STR$(n), LEN(STR$(c + l * (l - 1) / 2)) + 1);
       n = n + 1
   NEXT
   PRINT
NEXT


Output for 14 rows a true test of spacing:

 1
 2  3
 4  5  6
 7  8  9 10
11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44  45
46 47 48 49 50 51 52 53  54  55
56 57 58 59 60 61 62 63  64  65  66
67 68 69 70 71 72 73 74  75  76  77  78
79 80 81 82 83 84 85 86  87  88  89  90  91
92 93 94 95 96 97 98 99 100 101 102 103 104 105

Though I have to say, a fixed spacing and right alignment of all columns has a better look.