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#include <stdio.h>
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int factorial(int n) {
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int result = 1;
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for (int i = 1; i <= n; i++) {
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result *= i;
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}
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return result;
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}
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int main() {
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int n;
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printf("请输入一个非负整数：");
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scanf("%d", &n);
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printf("%d! = %d\n", n, factorial(n));
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return 0;
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}
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