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  1.  
  2. #include <stdio.h>
  3. // 必须用 long long 才能存下20!及累加和
  4. long long fact(int n)
  5. {
  6.     long long f;
  7.     if(n==1 || n==0) f=1;
  8.     else f = n * fact(n-1);
  9.     return f;
  10. }
  11. int main(void)
  12. {
  13.     long long sum=0;  // 累加和必须用long long
  14.     int j;
  15.     for(j=1;j<=20;j++)
  16.     {
  17.         sum = sum + fact(j);
  18.     }
  19.     printf("%lld", sum);  // long long 用%lld输出
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5320KB
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2561327494111820313
https://ideone.com/Sn1GWT
language:
C (gcc 8.3)
created:
16 hours ago
visibility:
public

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