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var v = 0.0
var x = start_dx
let dt = 0.1
while t <= 2.0 {
    let as_x = analyticalSolution(t:t)
    print(t, x * 1000, as_x * 1000, (x - as_x) * 1000)
 
    let F = -k * x
    let a = F / m
    let dv = a * dt
    let dx = v *  dt
    v += dv
    x += dx
    t += dt
}
 

prog.swift:2:9: error: use of unresolved identifier 'start_dx'
var x = start_dx
        ^~~~~~~~
prog.swift:4:7: error: use of unresolved identifier 't'
while t <= 2.0 {
      ^
prog.swift:2:5: note: did you mean 'x'?
var x = start_dx
    ^
prog.swift:3:5: note: did you mean 'dt'?
let dt = 0.1
    ^
prog.swift:1:5: note: did you mean 'v'?
var v = 0.0
    ^
prog.swift:5:16: error: use of unresolved identifier 'analyticalSolution'
    let as_x = analyticalSolution(t:t)
               ^~~~~~~~~~~~~~~~~~
prog.swift:5:37: error: use of unresolved identifier 't'
    let as_x = analyticalSolution(t:t)
                                    ^
prog.swift:6:11: error: use of unresolved identifier 't'
    print(t, x * 1000, as_x * 1000, (x - as_x) * 1000)
          ^
prog.swift:8:14: error: use of unresolved identifier 'k'
    let F = -k * x
             ^
prog.swift:9:9: note: did you mean 'a'?
    let a = F / m
        ^
prog.swift:2:5: note: did you mean 'x'?
var x = start_dx
    ^
prog.swift:1:5: note: did you mean 'v'?
var v = 0.0
    ^
prog.swift:9:17: error: use of unresolved identifier 'm'
    let a = F / m
                ^
prog.swift:8:9: note: did you mean 'F'?
    let F = -k * x
        ^
prog.swift:2:5: note: did you mean 'x'?
var x = start_dx
    ^
prog.swift:1:5: note: did you mean 'v'?
var v = 0.0
    ^
prog.swift:14:5: error: use of unresolved identifier 't'
    t += dt
    ^
<unknown>:0: error: error opening input file 'prog.o' (No such file or directory
)
clang: error: no such file or directory: 'prog.o'
clang: error: no such file or directory: '@prog.autolink'

Standard output is empty