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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5.     int a, b=2, c=1;
  6.     int i=1;
  7. 	for(i=0;i<=n;i++){
  8. 		a=-2*b+2*c;
  9. 		c=b;
  10. 		b=a;
  11. 	}
  12. 	return a;
  13. }
  14. int main(void) {
  15. 	int n = 3;
  16.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5316KB
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Standard input is empty
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数列anについて, n=3のときの値は56
https://ideone.com/allstM
language:
C (gcc 8.3)
created:
18 days ago
visibility:
public

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