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28 lines
328 B
28 lines
328 B
3 years ago
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package main
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import "errors"
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func main() {
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tt("*")
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}
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func add(a, b int) int {
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return a + b
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}
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func sub(a, b int) int {
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return a - b
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}
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func tt(s string) (func(a, b int) int, error) {
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switch s {
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case "+":
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return add, nil
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case "-":
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return sub, nil
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default:
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err := errors.New("输入错误")
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return nil, err
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}
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}
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