🚀 String concatenation and use of stringstream

Author: giobyte8

CMakeLists.txt

@@ -6,4 +6,5 @@ set(CMAKE_CXX_STANDARD 11)
 set(SOURCE_FILES main.cpp)
 add_executable(LearningCpp ${SOURCE_FILES})
 add_executable(Pythagoras src/pythagoras.cpp)
-add_executable(Greater src/greater.cpp)
+add_executable(Greater src/greater.cpp)
+add_executable(StringsConcat src/strings/concat.cpp)

src/strings/concat.cpp

@@ -0,0 +1,56 @@
+#include <iostream>
+#include <sstream>
+
+
+/**
+ * Append a char to a given text
+ * @param text String which to append char
+ * @param c Char to append to text
+ * @return Text with char concatenated
+ */
+std::string append(std::string text, char c) {
+ return text + c;
+}
+
+/**
+ * Strings are immutable, so a new string is created
+ * on each concatenation (Very expensive). Instead
+ * is a best practice to use a string stream
+ *
+ * @return String created through string stream
+ */
+std::string constructLargeString() {
+ std::stringstream stringBuilder;
+
+ for (int i = 0; i < 100; ++i) {
+ if (i % 10 == 0 && i > 0) {
+ stringBuilder << std::endl;
+ }
+
+ stringBuilder << "HH";
+ }
+
+ return stringBuilder.str();
+}
+
+int main() {
+ std::string text;
+
+ // This is an empty string:
+ std::cout << "Empty string:" << text << std::endl;
+
+ // Is possible append chars to empty string
+ text = append(text, '*');
+ std::cout << "Now string is: " << text << std::endl;
+
+ // Concat with std::string
+ text = text + " || Concatenated text";
+ std::cout << "Concatenated string is: " << text << std::endl;
+
+ // Very large string assembled through string stream
+ std::cout << "Large string is:" << std::endl;
+ std::cout << constructLargeString() << std::endl;
+
+
+ std::cout << std::endl << "Good bye!";
+}