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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int count = 0;
  5.  
  6.     for (int i = 1; i <= 10000; i++) {
  7.         int n = i, sum = 0;
  8.         while (n > 0) {
  9.             sum += n % 10;
  10.             n /= 10;
  11.         }
  12.         if (sum % 7 == 3) {
  13.             count++;
  14.         }
  15.     }
  16.  
  17.     printf("条件を満たす数の個数: %d\n", count);
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5292KB
comments (?)
stdin 
Standard input is empty
stdout 
条件を満たす数の個数: 1433
https://ideone.com/OPTDy7
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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