using System;
using iostream;
public class Test
{
public static void Main( )
{
int num,
userGuess,
result;
cout << "Enter a number." << endl;
cin >> num;
cout << endl
<< "How many prime numbers are between "
<< num
<< " and 0?" << endl;
cin >> userGuess;
for ( int i = num; i > 0 ; i-- ) {
result = 0 ;
if ( i == 2 ) {
result++;
cout << i << " - prime." << endl;
}
else if ( i == 1 ) {
//cout << i << " - not prime." << endl;
}
else if ( i % 2 == 0 ) {
//cout << i << " - not prime." << endl;
}
else if ( i % 3 == 0 ) {
//cout << i << " - not prime." << endl;
}
else if ( i % 5 == 0 ) {
//cout << i << " - not prime." << endl;
}
else if ( i % 7 == 0 ) {
//cout << i << " - not prime." << endl;
}
else if ( i % 9 == 0 ) {
//cout << i << " - not prime." << endl;
}
else {
cout << i << " - prime." << endl;
result++;
}
}
cout << result;
return 0 ;
}
}
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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