Create the first unix example

Samuel-de-Oliveira · Samuel-de-Oliveira · commit b235a6a9f7e4 · 2022-11-14T20:42:29.000-03:00
diff --git a/Unix_System_examples/Basic Calculator (TUI)/README.md b/Unix_System_examples/Basic Calculator (TUI)/README.md
@@ -0,0 +1,15 @@
+# Basic Calculator (TUI)
+
+## Compile: 
+Use the `m̀ake` command to compile
+
+## Usage
+You have 4 operatios `plus` `minus` `times` `devide`
+
+```
+# The hardest math problem.
+./calculator 6 times 3
+```
+
+the output should be a simple `18`
+
diff --git a/Unix_System_examples/Basic Calculator (TUI)/main.cpp b/Unix_System_examples/Basic Calculator (TUI)/main.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <string>
+#include <sstream>
+
+// Parse Float
+float parseFloat( const std::string &str ) {
+
+        std::stringstream ss(str);
+        float num;
+        ss >> num;
+        return num;
+
+}
+
+
+int main( int argc, char** argv ) {
+
+	const std::string Operation(argv[2]); // take the second argument before the "./calculator"
+	
+	if (Operation == "plus") std::cout << parseFloat(argv[1]) + parseFloat(argv[3]) << '\n'; // Plus
+	else if (Operation == "minus") std::cout << parseFloat(argv[1]) - parseFloat(argv[3]) << '\n'; // Minus
+	else if (Operation == "times") std::cout << parseFloat(argv[1]) * parseFloat(argv[3]) << '\n'; // Times
+	else if (Operation == "divide") std::cout << parseFloat(argv[1]) / parseFloat(argv[3]) << '\n'; // Divide
+	else std::cout << "Invalid operation\n"; // Invalid operation message
+
+	return 0;
+
+}
diff --git a/Unix_System_examples/Basic Calculator (TUI)/makefile b/Unix_System_examples/Basic Calculator (TUI)/makefile
@@ -0,0 +1,11 @@
+TARGET   = calculator
+FILE     = main.cpp
+COMPILER = /usr/bin/g++
+
+.PHONY: all clean
+
+all:
+	$(COMPILER) $(FILE) -o $(TARGET)
+
+clean:
+	rm -rf $(TARGET)
