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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n=100;
  5. 	int count=0;
  6. 	int i,j,is_prime;
  7. 	for(i=n;i>=2;i--){
  8. 		is_prime=1;
  9. 		for(j=2;j<i;j++){
  10. 			if(i%j==0){
  11. 				is_prime=0;
  12. 				break;
  13. 			}
  14. 		}
  15. 	if(is_prime==1)count++;
  16. 	}
  17. 	printf("%d以下の素数は%d個である\n",n,count);
  18.  
  19.  
  20.  
  21.  
  22.  
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
100以下の素数は25個である
https://ideone.com/E7tLyS
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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