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39 lines
601 B
Markdown
39 lines
601 B
Markdown
# 6-2 求排列数
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本题要求实现符号函数sign(x)。
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### 函数接口定义:
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```c++
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int sign( int x );
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```
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其中`x`是用户传入的整型参数。符号函数的定义为:若`x`大于0,`sign(x)` = $$1$$;若`x`等于0,`sign(x)` = $$0$$;否则,`sign(x)` = $$-1$$。
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### 裁判测试程序样例:
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```c++
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#include <stdio.h>
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int sign( int x );
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int main()
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{
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int x;
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scanf("%d", &x);
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printf("sign(%d) = %d\n", x, sign(x));
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return 0;
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}
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/* 你的代码将被嵌在这里 */
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```
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### 输入样例:
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```in
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10
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```
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### 输出样例:
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```out
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sign(10) = 1
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```
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