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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<math.h>
  4.  
  5. int fac(int n)
  6. {
  7.     if (n<0)
  8.     printf("Error!");
  9.     else
  10.         return pow(2,n);
  11. }
  12.  
  13. int main()
  14. {
  15.         int x;
  16.         printf("請輸入指數x的值:");
  17.         scanf("%d",&x);
  18.         printf("x=%d，此時2的x次方為%d\n",x,fac(x));
  19.         system("pause");
  20.         return 0;
  21. }
  22.  
Success #stdin #stdout #stderr 0s 3300KB
comments (?)
stdin 
2
stdout 
請輸入指數x的值:x=2，此時2的x次方為4
stderr 
sh: pause: not found
https://ideone.com/1wRzaK
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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