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  1. #include <stdio.h>
  2.  
  3. int eh_primo( int n )
  4. {
  5. 	int i = 0;
  6.  
  7. 	if( n <= 1 )
  8. 		return 0;
  9.  
  10. 	if( (n % 2 == 0) && (n > 2) )
  11. 		return 0;
  12.  
  13. 	for( i = 3; i < n / 2; i += 2 )
  14. 		if( n % i == 0 )
  15. 			return 0;
  16.  
  17. 	return 1;
  18. }
  19.  
  20. int somar_primos( int inicio, int fim )
  21. {
  22. 	int i = 0;
  23. 	int soma = 0;
  24.  
  25. 	for( i = inicio; i < fim; i++ )
  26. 		if( eh_primo(i) )
  27. 			soma += i;
  28.  
  29. 	return soma;
  30. }
  31.  
  32. int main( void )
  33. {
  34. 	int numI, numF;
  35. 	scanf("%d %d", &numI, &numF);
  36. 	printf( "%d\n", somar_primos( numI, numF ) );
  37. 	return 0;
  38. }
  39.  
Success #stdin #stdout 0s 4276KB
comments (?)
stdin 
2 10
stdout 
17
https://ideone.com/Het8z7
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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