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1.1 ! root 1: .pa 1 ! 2: .he 'DC (I)'1/15/73'DC (I)' ! 3: .ti 0 ! 4: NAME dc -- desk calculator ! 5: .sp ! 6: .ti 0 ! 7: SYNOPSIS dc__ [file] ! 8: .sp ! 9: .ti 0 ! 10: DESCRIPTION dc__ ! 11: is an arbitrary precision integer arithmetic package. ! 12: The overall structure of dc is ! 13: a stacking (reverse Polish) calculator. ! 14: The following constructions are recognized ! 15: by the calculator: ! 16: .sp ! 17: .in +3 ! 18: .ti -3 ! 19: number ! 20: .br ! 21: The value of the number is pushed on the stack. ! 22: A number is an unbroken string of the digits 0-9. ! 23: It may be preceded by an underscore (_) to input a ! 24: negative number. ! 25: .sp ! 26: .ti -3 ! 27: +_ -_ *_ /_ %_ ^_ ! 28: .br ! 29: The top two values on the stack are added (+_), ! 30: subtracted (-_), multiplied (*_), divided (/_), ! 31: remaindered (%_) or exponentiated (^). ! 32: The two entries are popped off the stack; ! 33: the result is pushed on the stack in their place. ! 34: .sp ! 35: .ti -3 ! 36: s_x ! 37: .br ! 38: The top of the stack is popped and stored into ! 39: a register named x, where x may be any character. ! 40: .sp ! 41: .ti -3 ! 42: l_x ! 43: .br ! 44: The value in register x is pushed on the stack. ! 45: The register x is not altered. ! 46: All registers start with zero value. ! 47: .sp ! 48: .ti -3 ! 49: d_ ! 50: .br ! 51: The top value on the stack is pushed on the stack. ! 52: Thus the top value is duplicated. ! 53: .sp ! 54: .ti -3 ! 55: p_ ! 56: .br ! 57: The top value on the stack is printed. ! 58: The top value remains unchanged. ! 59: .sp ! 60: .ti -3 ! 61: f_ ! 62: .br ! 63: All values on the stack and in registers are printed. ! 64: .sp ! 65: .ti -3 ! 66: .ul 1 ! 67: q ! 68: .br ! 69: exits the program. If executing a string, the nesting level is ! 70: popped by two. ! 71: .sp ! 72: .ti -3 ! 73: .ul ! 74: x ! 75: .br ! 76: treats the top element of the stack as a character string ! 77: and executes it as a string of dc commands. ! 78: .sp ! 79: .ti -3 ! 80: [...]_____ ! 81: .br ! 82: puts the bracketed ascii string onto the top of the stack. ! 83: .sp ! 84: .ti -3 ! 85: <_x =_x >_x ! 86: .br ! 87: The top two elements of the stack are popped and compared. ! 88: Register x is executed if they obey the stated ! 89: relation. ! 90: .sp ! 91: .ti -3 ! 92: .ul ! 93: v ! 94: .br ! 95: replaces the top element on the stack by its square root. ! 96: .sp ! 97: .ti -3 ! 98: !_ ! 99: .br ! 100: interprets the rest of the line as a UNIX command. ! 101: .sp ! 102: .ti -3 ! 103: c_ ! 104: .br ! 105: All values on the stack are popped. ! 106: .sp ! 107: .ti -3 ! 108: i_ ! 109: .br ! 110: The top value on the stack is popped and used as the ! 111: number radix for further input. ! 112: .sp ! 113: .ti -3 ! 114: o_ ! 115: .br ! 116: the top value on the stack is popped and used as the ! 117: number radix for further output. ! 118: .sp ! 119: .ti -3 ! 120: z_ ! 121: .br ! 122: the stack level is pushed onto the stack. ! 123: .sp ! 124: .ti -3 ! 125: ?_ ! 126: .br ! 127: a line of input is taken from the input source (usually the console) ! 128: and executed. ! 129: .sp ! 130: .ti -3 ! 131: new-line ! 132: .br ! 133: ignored except as the name of a register or to end the ! 134: response to a ?_. ! 135: .sp ! 136: .ti -3 ! 137: space ! 138: .br ! 139: ignored except as the name of a register or to terminate a number. ! 140: .br ! 141: .sp ! 142: .in -3 ! 143: If a file name is given, input is taken from that file until ! 144: end-of-file, then input is taken from the console. ! 145: .sp ! 146: An example to ! 147: calculate the monthly, weekly and ! 148: hourly rates for a $10,000/year salary. ! 149: .sp ! 150: .nf ! 151: .in +3 ! 152: 10000 ! 153: 100* (now in cents) ! 154: dsa (non-destructive store) ! 155: 12/ (pennies per month) ! 156: la52/ (pennies per week) ! 157: d10* (deci-pennies per week) ! 158: 375/ (pennies per hour) ! 159: f (print all results) ! 160: 512 ! 161: 19230 ! 162: 83333 ! 163: "a" 1000000 ! 164: .sp ! 165: .in -3 ! 166: An example which prints the first ten values of n! is ! 167: .in +3 ! 168: [la1+dsa*pla10>x]sx ! 169: 0sa1 ! 170: lxx ! 171: .sp ! 172: .fi ! 173: .in -3 ! 174: .ti 0 ! 175: FILES -- ! 176: .sp ! 177: .ti 0 ! 178: SEE ALSO msh(VII), salloc(III) ! 179: .sp ! 180: .ti 0 ! 181: DIAGNOSTICS (x) ? for unrecognized character x. ! 182: .br ! 183: (x) ? for not enough elements on the stack to do what was asked ! 184: by command x. ! 185: .br ! 186: "Out of space" when the free list is exhausted (too many digits). ! 187: .br ! 188: "Out of headers" for too many numbers being kept around. ! 189: .br ! 190: "Out of pushdown" for too many items on the stack. ! 191: .br ! 192: "Nesting Depth" for too many levels of nested execution. ! 193: .sp ! 194: .ti 0 ! 195: .ti 0 ! 196: BUGS --
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