delete pics to save space

history_source/ccf 入门篇/U4/4.4.6.cpp

@@ -0,0 +1,23 @@
+#include<iostream>
+using namespace std;
+int main()
+{
+	int a,b;
+	while(true)
+	{
+		cin>>a;
+		do
+		{
+			b=0;
+			do
+			{
+				b=b+a%10;
+				a/=10;
+			}
+			while(a>0);
+			a=b;
+		}
+		while(a/10>0);
+		cout<<a;
+	}
+}