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  1. using static System.Console;
  2. using System;
  3.  
  4. public class Test {
  5. 	public static void Main() {
  6. 		(var ok, var digitos) = ValidarCnpj("12345678901234");
  7. 		if (!ok) WriteLine($"Dígitos finais corretos seriam {digitos}");
  8. 		(ok, digitos) = ValidarCnpj("12.345.678.9012-34");
  9. 		if (!ok) WriteLine($"Dígitos finais corretos seriam {digitos}");
  10. 	}
  11. 	static (bool, string) ValidarCnpj(string cnpj) {
  12. 	    if (cnpj.Length < 14) return (false, "");
  13. 	    Span<int> digitos = stackalloc int[14];
  14. 	    for (int i = 0, j = 0; i < 14; j++) if (char.IsDigit(cnpj[j])) digitos[i++] = cnpj[j] - 48;
  15. 	    int soma = 0, soma2 = 0;
  16. 	    soma += digitos[0] * 5;
  17. 	    soma2 += digitos[0] * 6;
  18. 	    soma += digitos[1] * 4;
  19. 	    soma2 += digitos[1] * 5;
  20. 	    soma += digitos[2] * 3;
  21. 	    soma2 += digitos[2] * 4;
  22. 	    soma += digitos[3] * 2;
  23. 	    soma2 += digitos[3] * 3;
  24. 	    soma += digitos[4] * 9;
  25. 	    soma2 += digitos[4] * 2;
  26. 	    soma += digitos[5] * 8;
  27. 	    soma2 += digitos[5] * 9;
  28. 	    soma += digitos[6] * 7;
  29. 	    soma2 += digitos[6] * 8;
  30. 	    soma += digitos[7] * 6;
  31. 	    soma2 += digitos[7] * 7;
  32. 	    soma += digitos[8] * 5;
  33. 	    soma2 += digitos[8] * 6;
  34. 	    soma += digitos[9] * 4;
  35. 	    soma2 += digitos[9] * 5;
  36. 	    soma += digitos[10] * 3;
  37. 	    soma2 += digitos[10] * 4;
  38. 	    soma += digitos[11] * 2;
  39. 	    soma2 += digitos[11] * 3;
  40. 	    var resto = soma % 11;
  41. 	    var dv = digitos[12];
  42. 	    digitos[12] = resto < 2 ? 0 : 11 - resto;
  43. 	    soma2 += digitos[12] * 2;
  44. 	    var ok = digitos[12] == dv;
  45. 	    resto = soma2 % 11;
  46. 	    dv = digitos[13];
  47. 	    digitos[13] = resto < 2 ? 0 : 11 - resto;
  48. 	    return (ok && digitos[13] == dv, string.Concat(digitos[12], digitos[13]));
  49. 	}
  50. }
  51.  
  52. //https://pt.stackoverflow.com/q/60577/101
Success #stdin #stdout 0.05s 24708KB
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Dígitos finais corretos seriam 30
Dígitos finais corretos seriam 30
https://ideone.com/CDgjNe
language:
C# (NET 6.0)
created:
1 year ago
visibility:
public

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