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新增斐波那契数列计算功能,包含输入提示和结果输出,增强了程序的数学运算能力。
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fib.cn

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using lib <io>;
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fn fib(n : int) : int {
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if (n <= 1) {
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return n;
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} else {
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return fib(n - 1) + fib(n - 2);
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};
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};
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fn main() : int {
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std::println("请输入要计算的斐波那契项数 n:");
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input_str : string = std::input();
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n : int = input_str;
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result : int = fib(n);
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std::println("fib(" + n + ") = " + result);
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return 0;
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};

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