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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int i,a[30];
  5. 	a[0] = 2;a[1] = -1;
  6. 	for(i=2;i<30;i++){
  7. 		a[i] = -a[i-1]+a[i-2]+2; //数列の計算
  8. 		if(a[i]>5000){ //5000を超える条件
  9. 			printf("5000を超えるのは%d項目",i); //結果の表示
  10. 			break;
  11. 		}
  12. 	}
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5292KB
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5000を超えるのは18項目
https://ideone.com/49nvYA
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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