Resistance calculator: Difference between revisions
→{{header|Go}}: Added RPN version.
(→{{header|Perl 6}}: Added Perl 6 solution) |
(→{{header|Go}}: Added RPN version.) |
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Line 160:
}
node := r[7].add(r[9]).mul(r[8]).add(r[6]).mul(r[5]).add(r[4]).mul(r[3]).add(r[2]).mul(r[1]).add(r[0])
node.setVoltage(18)
fmt.Println(" Ohm Volt Ampere Watt Network tree")
node.report("")
}</lang>
===RPN===
<lang go>package main
import (
"fmt"
"strconv"
"strings"
)
type Stack []*Resistor
func (s *Stack) push(r *Resistor) {
*s = append(*s, r)
}
func (s *Stack) pop() *Resistor {
le := len(*s)
if le == 0 {
panic("Attempt to pop from an empty stack")
}
le--
r := (*s)[le]
*s = (*s)[:le]
return r
}
type Resistor struct {
symbol rune
resistance, voltage float64
a, b *Resistor
}
func (r *Resistor) res() float64 {
switch r.symbol {
case '+':
return r.a.res() + r.b.res()
case '*':
return 1 / (1/r.a.res() + 1/r.b.res())
default:
return r.resistance
}
}
func (r *Resistor) setVoltage(voltage float64) {
switch r.symbol {
case '+':
ra := r.a.res()
rb := r.b.res()
r.a.setVoltage(ra / (ra + rb) * voltage)
r.b.setVoltage(rb / (ra + rb) * voltage)
case '*':
r.a.setVoltage(voltage)
r.b.setVoltage(voltage)
}
r.voltage = voltage
}
func (r *Resistor) current() float64 {
return r.voltage / r.res()
}
func (r *Resistor) effect() float64 {
return r.current() * r.voltage
}
func (r *Resistor) report(level string) {
fmt.Printf("%8.3f %8.3f %8.3f %8.3f %s%c\n", r.res(), r.voltage, r.current(), r.effect(), level, r.symbol)
if r.a != nil {
r.a.report(level + "| ")
}
if r.b != nil {
r.b.report(level + "| ")
}
}
func build(rpn string) *Resistor {
st := new(Stack)
for _, token := range strings.Fields(rpn) {
switch token {
case "+":
b, a := st.pop(), st.pop()
st.push(&Resistor{'+', 0, 0, a, b})
case "*":
b, a := st.pop(), st.pop()
st.push(&Resistor{'*', 0, 0, a, b})
default:
r, _ := strconv.ParseFloat(token, 64)
st.push(&Resistor{'r', r, 0, nil, nil})
}
}
return st.pop()
}
func main() {
node := build("10 2 + 6 * 8 + 6 * 4 + 8 * 4 + 8 * 6 +")
node.setVoltage(18)
fmt.Println(" Ohm Volt Ampere Watt Network tree")
| |||