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  1. #include <stdio.h>
  2.  
  3. int main(void)
  4. {
  5.     int num;
  6.  
  7.     printf("0");
  8.     scanf("%d", &num);
  9.  
  10.     if (num < 0)
  11.     {
  12.         printf("エラー\n");
  13.     }
  14.  
  15.     return 0;
  16. }
  17.  
Success #stdin #stdout 0s 5284KB
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https://ideone.com/EFE5Ld
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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