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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.     }
  8.     else{
  9.     	return rec(n-1)+n*n;
  10.     }}
  11.     	int main(void) {
  12.     		int a;
  13.     		int n=4;
  14.     for (a=1;a<=n;a++)
  15.     printf("1から%dまでの二乗和の値は%d\n", a, rec(a));
  16. 	return 0;
  17. }
  18.  
  19.  
Success #stdin #stdout 0s 5272KB
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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/bwDxkN
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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