diff --git a/CM2005 Object Oriented Programming/Topic 1/1.3.1/a.exe b/CM2005 Object Oriented Programming/Topic 1/1.3.1/a.exe
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diff --git a/CM2005 Object Oriented Programming/Topic 1/1.3.1/main.cpp b/CM2005 Object Oriented Programming/Topic 1/1.3.1/main.cpp
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+++ b/CM2005 Object Oriented Programming/Topic 1/1.3.1/main.cpp	
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+#include <iostream>
+
+int main(int argc, char const *argv[])
+{
+  // 1 print help
+  std::cout << "3: Make an offer " << std::endl;
+  // 2 print exchange stats
+  std::cout << "2: Print exchange stats " << std::endl;
+  // 3 make an offer
+  std::cout << "3: Make an offer " << std::endl;
+  // 4 make a bid
+  std::cout << "4: Make a bid " << std::endl;
+  // 5 print wallet
+  std::cout << "5: Print wallet " << std::endl;
+  // 6 continue
+  std::cout << "6: Continue" << std::endl;
+  return 0;
+}
+
+// Used the command "g++ main.cpp -o merkletrade" to generated merkletrade.exe
\ No newline at end of file
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