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  1. using System;
  2. using iostream; 
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 	int num, 
  9. 	    userGuess, 
  10. 	    result;
  11.  
  12. 	cout << "Enter a number." << endl;
  13. 	cin >> num;
  14. 	cout << endl 
  15. 	     << "How many prime numbers are between "
  16. 	     << num
  17. 	     << " and 0?" << endl;
  18. 	cin >> userGuess;
  19.  
  20. 	for (int i = num; i > 0; i--) {
  21. 	    result = 0;
  22. 	    if (i == 2) {
  23. 	        result++;
  24. 	        cout << i << " - prime." << endl;
  25. 	    }
  26. 	    else if (i == 1) {
  27. 	        //cout << i << " - not prime." << endl;
  28. 	    }
  29. 	    else if (i % 2 == 0){
  30. 	        //cout << i << " - not prime." << endl;
  31. 	    }
  32. 	    else if (i % 3 == 0){
  33. 	        //cout << i << " - not prime." << endl;
  34. 	    }
  35. 	    else if (i % 5 == 0){
  36. 	        //cout << i << " - not prime." << endl;
  37. 	    }
  38. 	    else if (i % 7 == 0){
  39. 	        //cout << i << " - not prime." << endl;
  40. 	    }
  41. 	    else if (i % 9 == 0){
  42. 	        //cout << i << " - not prime." << endl;
  43. 	    }
  44. 	    else {
  45. 	        cout << i << " - prime." << endl;
  46. 	        result++;
  47. 	    }
  48. 	}
  49.  
  50. 	cout << result;
  51.  
  52.  
  53. 	return 0;
  54. 	}
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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100
compilation info 
prog.cs(2,7): error CS0246: The type or namespace name `iostream' could not be found. Are you missing an assembly reference?
Compilation failed: 1 error(s), 0 warnings
stdout
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Standard output is empty
https://ideone.com/nJDI6b
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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