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all: change optional to result of io (#16075)

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yuyi 2022-10-16 14:28:57 +08:00 • committed by GitHub
parent 6e46933c55
commit f6844e9766
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187 changed files with 1885 additions and 1874 deletions
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4
examples/mini_calculator.v
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@ -5,7 +5,7 @@ import os
const numeric_char = [`0`, `1`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `.`, `e`, `E`]
// Convert expression to Reverse Polish Notation.
fn expr_to_rev_pol(expr string) ?[]string {
fn expr_to_rev_pol(expr string) ![]string {
if expr == '' {
return error('err: empty expression')
}
@ -63,7 +63,7 @@ fn expr_to_rev_pol(expr string) ?[]string {
}
// Evaluate the result of Reverse Polish Notation.
fn eval_rev_pol(rev_pol []string) ?f64 {
fn eval_rev_pol(rev_pol []string) !f64 {
mut stack := []f64{}
for item in rev_pol {
if is_num_string(item) {