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  1. #include <stdio.h>
  2. //a{n}=2a_{n-1}+3, a{0}=-2(再帰無し版)
  3. int main(void) {
  4.     int n,an;
  5.     n = 4;
  6. 	for(int i=1;i<n;i++){
  7. 		an=2*an+3;
  8. 	}
  9.     printf("数列anの%d番目の値は%d\n", n, an);
  10. 	return 0;
  11. }
  12.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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数列anの4番目の値は21
https://ideone.com/EOm0fe
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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