'commit'

C++专题课程/质数相关/step1.cpp

@@ -0,0 +1,29 @@
+#include<iostream>
+using namespace std;
+
+
+//<2F>Ľ<EFBFBD>, ȥ<><C8A5>ż<EFBFBD><C5BC><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>
+bool isPrime(int n)
+{
+    if(n < 2) return false;
+    if(n == 2) return true;
+    if(n % 2 == 0) return false;
+    for(int i = 3; i < n; i += 2)
+        if(n%i == 0) return false;
+    return true;
+}
+//ʱ<>临<EFBFBD>Ӷ<EFBFBD>O(n/2), <20>ٶ<EFBFBD><D9B6><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>.
+
+
+int main()
+{
+	for(int i=0;i<100;i++)
+	{
+		if(isPrime(i))
+		{
+			cout<<i<<endl;
+		}
+	}
+	return 0;
+}
+