Home » Archimedes archive » Acorn User » AU 1997-10 A.adf » Extras » Apple][e/PD/BOB/ARMBOB/!ArmBob/progs/h/string/polystr
Apple][e/PD/BOB/ARMBOB/!ArmBob/progs/h/string/polystr
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
Tape/disk: | Home » Archimedes archive » Acorn User » AU 1997-10 A.adf » Extras |
Filename: | Apple][e/PD/BOB/ARMBOB/!ArmBob/progs/h/string/polystr |
Read OK: | ✔ |
File size: | 02E3 bytes |
Load address: | 0000 |
Exec address: | 0000 |
File contents
/* string representation of polynomial with coefficients in c and indeterminate x. Uses bob:h.string.string */ poly2str(c,x) { local n,i,prev,s,a; n = sizeof(c); prev = FALSE; s = ""; for ( i = 0; i < n; i++) if (a = c[i]) { s += coeff(a,prev,i)+monom(x,i); prev = TRUE; } return (prev)?s:"0"; } coeff(a,prev,deg) { local s; s = (prev && a>0)?"+":""; switch (a) { case 1: if (deg == 0) s += "1"; break; case -1: s += (deg == 0)?"-1":"-"; break; default: s += string(a,10); break; } return s; } monom(x,deg) { local s; switch (deg) { case 0: s = ""; break; case 1: s = x; break; default: s = x+"^"+string(deg,10); break; } return s; }
00000000 2f 2a 20 73 74 72 69 6e 67 20 72 65 70 72 65 73 |/* string repres| 00000010 65 6e 74 61 74 69 6f 6e 20 6f 66 20 70 6f 6c 79 |entation of poly| 00000020 6e 6f 6d 69 61 6c 20 77 69 74 68 20 63 6f 65 66 |nomial with coef| 00000030 66 69 63 69 65 6e 74 73 0a 20 20 20 69 6e 20 63 |ficients. in c| 00000040 20 61 6e 64 20 69 6e 64 65 74 65 72 6d 69 6e 61 | and indetermina| 00000050 74 65 20 78 2e 0a 0a 20 20 20 55 73 65 73 20 62 |te x... Uses b| 00000060 6f 62 3a 68 2e 73 74 72 69 6e 67 2e 73 74 72 69 |ob:h.string.stri| 00000070 6e 67 0a 2a 2f 0a 0a 70 6f 6c 79 32 73 74 72 28 |ng.*/..poly2str(| 00000080 63 2c 78 29 0a 7b 0a 20 6c 6f 63 61 6c 20 6e 2c |c,x).{. local n,| 00000090 69 2c 70 72 65 76 2c 73 2c 61 3b 0a 20 6e 20 3d |i,prev,s,a;. n =| 000000a0 20 73 69 7a 65 6f 66 28 63 29 3b 0a 20 70 72 65 | sizeof(c);. pre| 000000b0 76 20 3d 20 46 41 4c 53 45 3b 0a 20 73 20 3d 20 |v = FALSE;. s = | 000000c0 22 22 3b 0a 20 66 6f 72 20 28 20 69 20 3d 20 30 |"";. for ( i = 0| 000000d0 3b 20 69 20 3c 20 6e 3b 20 69 2b 2b 29 0a 20 20 |; i < n; i++). | 000000e0 20 69 66 20 28 61 20 3d 20 63 5b 69 5d 29 0a 20 | if (a = c[i]). | 000000f0 20 20 7b 0a 20 20 20 20 73 20 2b 3d 20 63 6f 65 | {. s += coe| 00000100 66 66 28 61 2c 70 72 65 76 2c 69 29 2b 6d 6f 6e |ff(a,prev,i)+mon| 00000110 6f 6d 28 78 2c 69 29 3b 0a 20 20 20 20 70 72 65 |om(x,i);. pre| 00000120 76 20 3d 20 54 52 55 45 3b 0a 20 20 20 7d 0a 20 |v = TRUE;. }. | 00000130 72 65 74 75 72 6e 20 28 70 72 65 76 29 3f 73 3a |return (prev)?s:| 00000140 22 30 22 3b 0a 7d 0a 0a 63 6f 65 66 66 28 61 2c |"0";.}..coeff(a,| 00000150 70 72 65 76 2c 64 65 67 29 0a 7b 0a 20 6c 6f 63 |prev,deg).{. loc| 00000160 61 6c 20 73 3b 0a 20 73 20 3d 20 28 70 72 65 76 |al s;. s = (prev| 00000170 20 26 26 20 61 3e 30 29 3f 22 2b 22 3a 22 22 3b | && a>0)?"+":"";| 00000180 0a 20 73 77 69 74 63 68 20 28 61 29 0a 20 7b 0a |. switch (a). {.| 00000190 20 20 63 61 73 65 20 31 3a 0a 20 20 20 20 69 66 | case 1:. if| 000001a0 20 28 64 65 67 20 3d 3d 20 30 29 20 73 20 2b 3d | (deg == 0) s +=| 000001b0 20 22 31 22 3b 0a 20 20 20 20 62 72 65 61 6b 3b | "1";. break;| 000001c0 0a 20 20 63 61 73 65 20 2d 31 3a 0a 20 20 20 20 |. case -1:. | 000001d0 73 20 2b 3d 20 28 64 65 67 20 3d 3d 20 30 29 3f |s += (deg == 0)?| 000001e0 22 2d 31 22 3a 22 2d 22 3b 0a 20 20 20 20 62 72 |"-1":"-";. br| 000001f0 65 61 6b 3b 0a 20 20 64 65 66 61 75 6c 74 3a 0a |eak;. default:.| 00000200 20 20 20 20 73 20 2b 3d 20 73 74 72 69 6e 67 28 | s += string(| 00000210 61 2c 31 30 29 3b 0a 20 20 20 20 62 72 65 61 6b |a,10);. break| 00000220 3b 0a 20 7d 0a 20 72 65 74 75 72 6e 20 73 3b 0a |;. }. return s;.| 00000230 7d 0a 20 0a 6d 6f 6e 6f 6d 28 78 2c 64 65 67 29 |}. .monom(x,deg)| 00000240 0a 7b 0a 20 6c 6f 63 61 6c 20 73 3b 0a 20 73 77 |.{. local s;. sw| 00000250 69 74 63 68 20 28 64 65 67 29 0a 20 7b 0a 20 20 |itch (deg). {. | 00000260 63 61 73 65 20 30 3a 0a 20 20 20 20 73 20 3d 20 |case 0:. s = | 00000270 22 22 3b 0a 20 20 20 20 62 72 65 61 6b 3b 0a 20 |"";. break;. | 00000280 20 63 61 73 65 20 31 3a 0a 20 20 20 20 73 20 3d | case 1:. s =| 00000290 20 78 3b 0a 20 20 20 20 62 72 65 61 6b 3b 0a 20 | x;. break;. | 000002a0 20 64 65 66 61 75 6c 74 3a 0a 20 20 20 20 73 20 | default:. s | 000002b0 3d 20 78 2b 22 5e 22 2b 73 74 72 69 6e 67 28 64 |= x+"^"+string(d| 000002c0 65 67 2c 31 30 29 3b 0a 20 20 20 20 62 72 65 61 |eg,10);. brea| 000002d0 6b 3b 0a 20 7d 0a 20 72 65 74 75 72 6e 20 73 3b |k;. }. return s;| 000002e0 0a 7d 0a |.}.| 000002e3