delete pics to save space

history_source/ccf 入门篇/U2/2.2.6.cpp

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+#include<iostream>
+#include<cmath> 
+using namespace std;
+int main()
+{
+	cout<<"ceil(3.14)="<<ceil(3.14)<<" floor(3.14)="<<floor(3.14)<<endl;
+	cout<<"4^3.0="<<pow(4,3.0)<<endl;
+	cout<<"sqrt(9)="<<sqrt(9)<<endl;
+	while(true);
+}