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  1. #include <stdio.h>
  2. //再帰を用いて1からnまでの二乗和1^2 + 2^2 + 3^2 + ... + n^2を計算する
  3. int rec(int n){
  4.     if (n == 1){
  5.     return 1;
  6.     }
  7.     else{
  8.     return n * n + rec(n - 1);
  9.     }
  10. }
  11. int main(void) {
  12. 	int n = 4;
  13.     for (int k = 1; k <= n; k++) {
  14.         printf("1から%dまでの二乗和の値は%d\n", k, rec(k));
  15.     }
  16.     printf("\n");
  17. 	return 0;
  18. }
  19.  
  20.  
  21.  
Success #stdin #stdout 0s 5324KB
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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
1から4までの二乗和の値は30
https://ideone.com/AFBdWx
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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