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=={{header|Vlang}}==
<lang vlang>const (
MaxDepthmax_depth = 256
)
struct Stack {
mut:
data []f32 = []f32(0)].repeat(MaxDepth){len: max_depth}
depth int=0
}
fn (s mut s Stack) push(v f32) {
if s.depth >= MaxDepthmax_depth {
return
}
println('Push: ${v : 3.2f}')
s.data[s.depth] = v
s.depth++
}
fn (s mut s Stack) pop() ?f32 {
if s.depth > 0 {
s.depth--
result := s.data[s.depth]
println('Pop: top of stack was ${result :3.2f}')
return result
}
return error('Stack Underflow!!')
}
fn (s Stack) peek() ?f32 {
if s.depth > 0 {
result := s.data[s.depth - 1]
println('Peek: top of stack is ${result :3.2f}')
return result
}
return error('Out of Bounds...')
}
fn (s Stack) empty() bool {
return s.depth == 0
}
fn main() {
mut stack := Stack{}
println('Stack is empty? ' + if stack.empty() { 'Yes' } else { 'No' })
stack.push(5.0)
stack.push(4.2)
println('Stack is empty? ' + if stack.empty() { 'Yes' } else { 'No' })
stack.peek() or { return }
stack.pop() or { return }▼ return
stack.pop() or { return }
return
}
stack.pop() or {
return
}
}
</lang>
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