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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int data[10];
  5.     int count = 0;
  6.  
  7.     data[0] = 1;
  8.     data[1] = 2;
  9.  
  10.     for (int i = 2; i < 10; i++) {
  11.         data[i] = data[i - 1] * 3 + data[i - 2] * 2;
  12.     }
  13.  
  14.     for (int i = 0; i < 10; i++) {
  15.         if (data[i] >= 1000 && data[i] <= 10000) {
  16.             count++;
  17.         }
  18.     }
  19.  
  20.     printf("1000以上10000以下となる項は %d 個です\n", count);
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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1000以上10000以下となる項は 2 個です
https://ideone.com/f58gsI
language:
C (gcc 8.3)
created:
18 days ago
visibility:
public

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