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  1. #include <stdio.h>
  2. //a{n+1} = -2a{n} + 4, a{0}=2(再帰あり版)
  3. int rec(int n){
  4. 	int i,an;
  5. 	an=2;
  6. 	for(i=0;i<n;i++){
  7. 		an=-2*an +4;
  8. 	}
  9. 	return an;
  10. }
  11. int main(void) {
  12.     int n;
  13.     scanf("%d",&n);
  14.     printf("数列a%dの値は%d\n", n, rec(n));
  15.    	return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5316KB
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5
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数列a5の値は-20
https://ideone.com/YJuDbN
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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