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  1. #include <stdio.h>
  2. long  Fact(int  n);
  3. int main(void)
  4. {
  5.     int  n;
  6.     long result;
  7.     printf("Input n:");
  8.     scanf("%d", &n);
  9.     result = Fact(n);            /* 调用递归函数Fact()计算n! */
  10.     if(result == -1)              /* 处理非法数据 */
  11.         printf("n<0, data error!\n");
  12.     else                            /* 输出n!值 */
  13.         printf("%d! = %ld\n", n, result);
  14.     return 0;
  15. }
  16. /* 函数功能：用递归法计算n!，当n>=0时返回n!，否则返回-1 */
  17. long  Fact(int  n)
  18. {
  19. if (n<0)
  20. return -1;
  21. else if (n==0||n==1)
  22. return 1;
  23. else
  24. return(n*Fact(n-1));
  25.  
  26.  
  27. }
  28.  
Success #stdin #stdout 0s 5320KB
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stdin
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5
stdout
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Input n:5! = 120
https://ideone.com/VCCLxv
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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