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  1. #include <stdio.h>
  2. int main(void)
  3. {
  4.  
  5.  
  6.  int a;
  7.  int i;
  8.  int isPrime=1;
  9. printf("正の整数を入力してください");
  10. scanf("%d",&a);
  11. if(a<=1)
  12. {
  13.   printf("%dは素数でない",a);
  14.   return 0;
  15. }
  16.  
  17. for(i=2; i*i<=a; i++)
  18. {
  19.  if(a%i==0)
  20. {
  21.  isPrime=0;
  22.  
  23.  break;
  24. }
  25. }
  26.  
  27.  
  28. if(isPrime)
  29. {
  30.  
  31. printf("%dは素数",a);
  32.  
  33. }
  34.  
  35. else
  36. {
  37. printf("%dは素数でない",a);
  38. }
  39.  
  40.  
  41. return 0;
  42. }
  43.  
  44.  
  45.  
  46.  
  47.  
  48.  
Success #stdin #stdout 0s 5320KB
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stdin
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4
stdout
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正の整数を入力してください4は素数でない
https://ideone.com/uTzF2z
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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