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  1. using static System.Console;
  2. using System;
  3.  
  4. (var ok, var digitos) = ValidarCnpj("12345678901234");
  5. if (!ok) WriteLine($"Dígitos finais corretos seriam {digitos}");
  6. (ok, digitos) = ValidarCnpj("12.345.678.9012-34");
  7. if (!ok) WriteLine($"Dígitos finais corretos seriam {digitos}");
  8.  
  9. static (bool, string) ValidarCnpj(string cnpj) {
  10. 	if (cnpj.Length < 14) return (false, "");
  11.     Span<int> digitos = stackalloc int[14];
  12. 	for (int i = 0, j = 0; i < 14; j++) if (char.IsDigit(cnpj[j])) digitos[i++] = cnpj[j] - 48;
  13.     int soma = 0, soma2 = 0;
  14. 	for (var i = 0; i < 4; i++) {
  15. 		soma += digitos[i] * (5 - i);
  16. 		soma2 += digitos[i] * (6 - i);
  17. 	}
  18. 	soma2 += digitos[4] * 2;
  19. 	for (var i = 4; i < 11; i++) {
  20. 		soma += digitos[i] * (13 - i);
  21. 		soma2 += digitos[i + 1] * (13 - i);
  22. 	}
  23. 	soma += digitos[11] * 2;
  24.     var resto = soma % 11;
  25. 	var dv = digitos[12];
  26.     digitos[12] = resto < 2 ? 0 : 11 - resto;
  27.     soma2 += digitos[12] * 2;
  28. 	var ok = digitos[12] == dv;
  29.     resto = soma2 % 11;
  30. 	dv = digitos[13];
  31. 	digitos[13] = resto < 2 ? 0 : 11 - resto;
  32.     return (ok && digitos[13] == dv, string.Concat(digitos[12], digitos[13]));
  33. }
  34.  
  35. //https://pt.stackoverflow.com/q/60577/101
Success #stdin #stdout 0.05s 24644KB
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Dígitos finais corretos seriam 30
Dígitos finais corretos seriam 30
https://ideone.com/WjFZ7P
language:
C# (NET 6.0)
created:
2 years ago
visibility:
public

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