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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int data[10];
  5.     int count = 0; 
  6.  
  7.  
  8.     data[0] = 1;
  9.     data[1] = 2;
  10.  
  11.  
  12.     for (int i = 2; i < 10; i++) {
  13.         data[i] = 3 * data[i-1] + 2 * data[i-2];
  14.     }
  15.  
  16.  
  17.     for (int i = 0; i < 10; i++) {
  18.         if (data[i] >= 100 && data[i] <= 10000) {
  19.             count++;
  20.         }
  21.     }
  22.  
  23.  
  24.     printf("100以上10000以下の数字は %d 個あります。\n", count);
  25.  
  26.     return 0;
  27. }
Success #stdin #stdout 0s 5320KB
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stdout
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100以上10000以下の数字は 4 個あります。
https://ideone.com/BNzbSL
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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