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  1. #include <iostream>
  2. #include <cstdio>
  3.  
  4. bool find_n(double P, int M, int N){
  5. 	char fmt[16], snum[32], *p;
  6. 	std::sprintf(fmt, "%%.%dlf", N);
  7. 	std::sprintf(snum, fmt, P);
  8.  
  9. 	for(p = &snum[0]; *p; ++p){
  10. 		if(*p == '.' || *p == ','){
  11. 			++p;
  12. 			break;
  13. 		}
  14. 	}
  15.  
  16. 	if(*p){
  17. 		for(int i = 0; *p && (i < N); ++i, ++p){
  18. 			if((int)(*p - '0') == M)
  19. 				return true;
  20. 		}
  21. 	}
  22. 	return false;
  23. }
  24.  
  25. int main(void){
  26. 	double P = 999.01234;
  27. 	int    N = 5;
  28. 	int    M = 3;
  29.  
  30. 	if(find_n(P, M, N))
  31. 		std::cout << "Yes.";
  32. 	else
  33. 		std::cout << "Not!";
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3456KB
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Standard input is empty
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Yes.
https://ideone.com/fS3D3G
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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