![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to bas.1 CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Research Unix] / researchv10dc / dist / man / v3 / man1|
Return to bas.1 CVS log | Up to [Research Unix] / researchv10dc / dist / man / v3 / man1 |
1.1 ! root 1: .pa 1 ! 2: .he 'BAS (I)'1/15/73'BAS (I)' ! 3: .ti 0 ! 4: NAME bas -- basic ! 5: .sp ! 6: .ti 0 ! 7: SYNOPSIS bas___ [ file ] ! 8: .sp ! 9: .ti 0 ! 10: DESCRIPTION bas___ ! 11: is a dialect of basic [1]. ! 12: If a file argument is provided, ! 13: the file is used for input before the console ! 14: is read. ! 15: .sp ! 16: bas___ accepts lines of the form: ! 17: .sp ! 18: statement ! 19: integer statement ! 20: .sp ! 21: Integer numbered statements ! 22: (known as internal statements) ! 23: are stored for later execution. ! 24: They are stored in sorted ascending order. ! 25: Non-numbered statements are immediately executed. ! 26: The result of an immediate expression statement ! 27: (that does not have '=' as its highest operator) is printed. ! 28: .sp ! 29: Statements have the following syntax: ! 30: .sp ! 31: .in +6 ! 32: .ti -3 ! 33: expression ! 34: .br ! 35: The expression is executed for its side ! 36: effects (assignment or function call) ! 37: or for printing as described above. ! 38: .sp ! 39: .ti -3 ! 40: done____ ! 41: .br ! 42: Return to system level. ! 43: .sp ! 44: .ti -3 ! 45: draw____ expression expression expression ! 46: .br ! 47: A line is drawn on the Tektronix 611 display (/dev/vt0) from ! 48: the current display position ! 49: to the XY co-ordinates specified by the ! 50: first two expressions. ! 51: (The scale is zero to one in both X and Y directions) ! 52: If the third expression ! 53: is zero, the line is invisible. ! 54: The current display position is set to the end point. ! 55: .sp ! 56: .ti -3 ! 57: display_______ list ! 58: .br ! 59: The list of expressions and strings is ! 60: concatenated and displayed (i.e. printed) on the 611 starting ! 61: at the current display position. ! 62: The current display position is not changed. ! 63: .sp ! 64: .ti -3 ! 65: erase_____ ! 66: .br ! 67: The 611 screen is erased. ! 68: .sp ! 69: .ti -3 ! 70: for___ name =_= expression expression statement ! 71: .ti -3 ! 72: for___ name =_ expression expression ! 73: .br ! 74: .li ! 75: ... ! 76: .ti -3 ! 77: next____ ! 78: .br ! 79: The for___ statement ! 80: repetitively executes a ! 81: statement (first form) ! 82: or a group of statements (second form) ! 83: under control of a named variable. ! 84: The variable takes on the value of ! 85: the first expression, ! 86: then is incremented by one on each loop, ! 87: not to exceed the value of ! 88: the second expression. ! 89: .sp ! 90: .ti -3 ! 91: goto____ expression ! 92: .br ! 93: The expression is evaluated, truncated to an integer ! 94: and execution goes to the corresponding integer numbered statment. ! 95: If executed from immediate mode, ! 96: the internal statements are compiled first. ! 97: .sp ! 98: .ti -3 ! 99: if__ expression statement ! 100: .br ! 101: The statement is executed if the expression evaluates ! 102: to non-zero. ! 103: .sp ! 104: .ti -3 ! 105: list____ [expression [expression]] ! 106: .br ! 107: list____ is used to print out the stored internal statements. ! 108: If no arguments are given, all internal statements are printed. ! 109: If one argument is given, only that ! 110: internal statement is listed. ! 111: If two arguments are given, all internal statements ! 112: inclusively between the arguments are printed. ! 113: .sp ! 114: .ti -3 ! 115: print_____ list ! 116: .br ! 117: The list of expressions and strings are concatenated and ! 118: printed. ! 119: (A string is delimited by " characters.) ! 120: .sp ! 121: .ti -3 ! 122: return______ [expression] ! 123: .br ! 124: The expression is evaluated and the result is passed ! 125: back as the value of a function call. ! 126: If no expression is given, zero is returned. ! 127: .sp ! 128: .ti -3 ! 129: run___ ! 130: .br ! 131: The internal statements are compiled. ! 132: The symbol table is re-initialized. ! 133: The random number generator is re-set. ! 134: Control is passed to the lowest numbered internal ! 135: statement. ! 136: .sp ! 137: .ti -6 ! 138: Expressions have the following syntax: ! 139: .sp ! 140: .ti -3 ! 141: name ! 142: .br ! 143: A name is used to specify a variable. ! 144: Names are composed of a letter ('a' - 'z') ! 145: followed by letters and digits. ! 146: The first four characters of a name are significant. ! 147: .sp ! 148: .ti -3 ! 149: number ! 150: .br ! 151: A number is used to represent a constant value. ! 152: A number is composed of digits, at most one decimal point ('.') ! 153: and possibly a scale factor of the form ! 154: e_ digits or e-__ digits. ! 155: .sp ! 156: .ti -3 ! 157: (_ expression )_ ! 158: .br ! 159: Parentheses are used to alter normal order of evaluation. ! 160: .sp ! 161: .ti -3 ! 162: expression operator expression ! 163: .br ! 164: Common functions of two arguments are abbreviated ! 165: by the two arguments separated by an operator denoting the function. ! 166: A complete list of operators is given below. ! 167: .sp ! 168: .ti -3 ! 169: expression (_ [expression [,_ expression ...]] )_ ! 170: .br ! 171: Functions of an arbitrary number of arguments ! 172: can be called by an expression followed by the arguments ! 173: in parentheses separated by commas. ! 174: The expression evaluates to the ! 175: line number of the entry of the function in the ! 176: internally stored statements. ! 177: This causes the internal statements to be compiled. ! 178: If the expression evaluates negative, ! 179: a builtin function is called. ! 180: The list of builtin functions appears below. ! 181: .sp ! 182: .ti -3 ! 183: name [_ expression [,_ expression ...] ]_ ! 184: .br ! 185: Each expression is truncated to an integer ! 186: and used as a specifier for the name. ! 187: The result is syntactically identical to a name. ! 188: a[1,2] is the same as a[1][2]. ! 189: The truncated expressions are restricted to ! 190: values between 0 and 32767. ! 191: .sp ! 192: .ti -6 ! 193: The following is the list of operators: ! 194: .sp ! 195: .ti -3 ! 196: = ! 197: .br ! 198: = is the assignment operator. ! 199: The left operand must be a name or an array element. ! 200: The result is the right operand. ! 201: Assignment binds right to left, ! 202: all other operators bind left to right. ! 203: .sp ! 204: .ti -3 ! 205: & | ! 206: .br ! 207: &_ (logical and) ! 208: has result zero if either of its arguments are zero. ! 209: It has result one if both its arguments are non-zero. ! 210: |_ (logical or) ! 211: has result zero if both of its arguments are zero. ! 212: It has result one if either of its arguments are non-zero. ! 213: .sp ! 214: .ti -3 ! 215: < <= > >= == <> ! 216: .br ! 217: The relational operators ! 218: (< less than, <= less than or equal, ! 219: > greater than, ! 220: >= greater than or equal, ! 221: == equal to, ! 222: <> not equal to) ! 223: return one if their arguments are in the specified ! 224: relation. ! 225: They return zero otherwise. ! 226: Relational operators at the same level extend as follows: ! 227: a>b>c is the same as a>b&b>c. ! 228: .sp ! 229: .ti -3 ! 230: + - ! 231: .br ! 232: Add and subtract. ! 233: .sp ! 234: .ti -3 ! 235: * / ! 236: .br ! 237: Multiply and divide. ! 238: .sp ! 239: .ti -3 ! 240: ^ ! 241: .br ! 242: Exponentiation. ! 243: .sp ! 244: .ti -6 ! 245: The following is a list of builtin functions: ! 246: .sp ! 247: .ti -3 ! 248: arg ! 249: .br ! 250: Arg(i) is the value of the i_th ! 251: actual parameter on the current level ! 252: of function call. ! 253: .sp ! 254: .ti -3 ! 255: exp ! 256: .br ! 257: Exp(x) is the exponential function of x. ! 258: .sp ! 259: .ti -3 ! 260: log ! 261: .br ! 262: Log(x) is the logarithm base e of x. ! 263: .sp ! 264: .ti -3 ! 265: sin ! 266: .br ! 267: Sin(x) is the sine of x (radians). ! 268: .sp ! 269: .ti -3 ! 270: cos ! 271: .br ! 272: Cos(x) is the cosine of x (radians). ! 273: .sp ! 274: .ti -3 ! 275: atn ! 276: .br ! 277: Atn(x) is the arctangent of x. ! 278: .sp ! 279: .ti -3 ! 280: rnd ! 281: .br ! 282: Rnd() is a uniformly distributed random ! 283: number between zero and one. ! 284: .sp ! 285: .ti -3 ! 286: expr ! 287: .br ! 288: Expr() is the only form of program input. ! 289: A line is read from the input and ! 290: evaluated as an expression. ! 291: The resultant value is returned. ! 292: .sp ! 293: .ti -3 ! 294: int ! 295: .br ! 296: Int(x) returns x truncated to an integer. ! 297: .in -6 ! 298: .sp ! 299: .ti 0 ! 300: FILES /tmp/btm? temporary ! 301: .sp ! 302: .ti 0 ! 303: SEE ALSO [1] DEC-11-AJPB-D ! 304: .sp ! 305: .ti 0 ! 306: DIAGNOSTICS Syntax ! 307: errors cause the incorrect line to be typed ! 308: with an underscore where the parse failed. ! 309: All other diagnostics are self explanatory. ! 310: .sp ! 311: .ti 0 ! 312: BUGS --
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.