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#include <stdio.h>
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int N(int n)
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{
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if(n<=1)
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return 1;
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else
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return N(n-1)*n;//关键思想
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}
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int main()
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{
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int n=0;
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int ret=0;
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printf("请输入你想要求阶乘的数：");
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scanf("%d",&n);
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ret=N(n);
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printf("%d的阶乘是%d\n",n,ret);
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return 0;
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}
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