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  1. #include <stdio.h>
  2.  
  3. int a(int n)
  4. {
  5.     int i, result = 1;
  6.     for (i = 2; i <= n; i++) {
  7.         result = 2 * result + 2;
  8.     }
  9.     return result;
  10. }
  11.  
  12. int main()
  13. {
  14.     printf("答えは:%d\n", a(4));
  15.     return 0;
  16. }
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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答えは:22
https://ideone.com/JfeQTY
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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