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3-1-2.cpp

+#include <iostream>
+#include <string>
+
+int main()
+{
+	std::string s0("abcdef");  
+	
+	std::string s1("abc");
+	std::string s2("def");
+	std::string s3(s0);   
+	std::string s4("a");
+	std::string s5("f");
+
+	std::cout << "s1: " << s1 << "\ns2: " << s2 << "\ns3: " << s3;
+	std::cout << "\ns4: " << s4 << "\ns5: " << s5;
+	
+	return 0;
+}
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