1 files changed, 51 insertions, 0 deletions
diff --git a/Bachelor/Prog1/Prakt2/prg1p2_4/prg1p2_4.cpp b/Bachelor/Prog1/Prakt2/prg1p2_4/prg1p2_4.cpp
new file mode 100644
index 0000000..b649a6a
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+++ b/Bachelor/Prog1/Prakt2/prg1p2_4/prg1p2_4.cpp
@@ -0,0 +1,51 @@
+// Programmieren 1, Praktikum 2, Aufgabe 4
+// Sven Eisenhauer
+// 05.11.2004
+//
+// file: prg1p2_4.cpp
+//
+// purpose: Program to find all prime numbers, which are smaller than the entered positive number
+//          
+
+#include <iostream>
+#include <iomanip>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+int main()
+{
+	int iNumber=0;
+	int iIsPrime=0;
+
+	system ("cls");
+	cout << "Please enter a positive number: ";
+	cin >> iNumber;
+	if (0 >= iNumber)  // handle wrong input in some way
+	{
+		cout << "Not a positive number!!!";
+		system ("pause");
+	}
+	else // end error handler
+	{  // let's begin
+		for (int iOuterCounter=iNumber;iOuterCounter>1;iOuterCounter--)
+		{  // decrement the number and check, if it is a prime (modulo any number is 0)
+			iIsPrime=0; // we asume actual number is a prime
+			for (int iInnerCounter=iOuterCounter-1;iInnerCounter>1;iInnerCounter--)
+			{
+				if ( 0 == iOuterCounter%iInnerCounter)
+				{
+					iIsPrime=1;  // actual number is NOT a prime
+				}
+			}// end inner for routine
+			if (0 == iIsPrime)
+				cout << endl << iOuterCounter;
+
+		} // end outer for routine
+		cout << endl;
+		system ("pause"); // wait a moment for user to read
+
+	} // end else
+	return 0;
+}// end main
+\ No newline at end of file