Update 动态数组.cpp

practical_exercises/key_exercises/动态数组.cpp

@@ -1,5 +1,14 @@
 #include<iostream>
-char *sPtr;        		//存放字符串的指针       
-s="哈哈"      
-sPtr = new char[strlen(s)+1];
-strncpy(sPtr,s;  
+#include<cstring>
+
+
+int main() {
+  
+  char *sPtr;        	 
+  const char* s="hello";
+  sPtr = new char[strlen(s)+1];
+  strncpy(sPtr,s,strlen(s)); 
+  std::cout << sPtr << std::endl;
+  delete sPtr;
+  return  0;
+}