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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int a[100];
  5.     a[0] = 2;
  6.     a[1] = -1;
  7.  
  8.     for (int i = 0; i < 98; i++) { // a[i+2] まで使うので i<98
  9.         a[i + 2] = -a[i + 1] + a[i] + 2;
  10.         if (a[i + 2] > 5000) {
  11.             printf("第%d項の値は%dです\n", i + 2, a[i + 2]);
  12.             break;
  13.         }
  14.     }
  15.  
  16.     return 0;
  17. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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第18項の値は7754です
https://ideone.com/JbmeZg
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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