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  1. #include <stdio.h>
  2.  
  3. int rec(int n)
  4. {
  5.     if (n == 1) {
  6.         return 1;
  7.     }
  8.     else {
  9.         return rec(n - 1) + n * n;
  10.     }
  11. }
  12.  
  13. int main(void)
  14. {
  15.     int n = 3;
  16.  
  17.     for (int i = 1; i <= n; i++) {
  18.         printf("1から%dまでの二乗和の値は%d\n", i, rec(i));
  19.     }
  20.  
  21.     return 0;
  22. }
  23.  
  24.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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1から1までの二乗和の値は1
1から2までの二乗和の値は5
1から3までの二乗和の値は14
https://ideone.com/tb42gn
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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