chpt 1 ... 1.4

Author: elstr-512

README.md

@@ -1,3 +1,5 @@
 # Data_Structures_and_Algorithms_in_cpp
 
-hello :)
+hello :)
+
+https://code.visualstudio.com/docs/cpp/config-linux#_debug-helloworldcpp

source/chpt_1_ACppPrimer/aSimpleCppProgram.cpp

@@ -0,0 +1,42 @@
+#include <cstdlib>
+#include <iostream>
+#include <string>
+using std::string;
+using std::cout;
+
+void characters() {
+    std::cout << " 'A' = " << int('A') << std::endl;
+    std::cout << "'\\0' = " << int('\0') << std::endl;
+}
+
+void sizes() {
+    std::cout << "size of int  " << sizeof(int) << std::endl;
+    std::cout << "size of long " << sizeof(long) << std::endl;
+    std::cout << "size of char " << sizeof(char) << std::endl;
+
+}
+
+void usingStrings() {
+    string s = "to be";
+    string t = "not" + s;
+    string u = s + " or " + t;
+    if (s > t) {
+        cout << u << std::endl;
+    }
+    
+}
+
+/* This program inputs two numbers x and y and outputs their sum */
+int main() {
+    int x, y;
+    std::cout << "Please enter two numbers: ";
+    std::cin >> x >> y;   // input x and y
+    int sum = x + y;      // compute their sum
+    std::cout << "Their sum is " << sum << std::endl;
+    
+    characters();
+    sizes();
+    usingStrings();
+
+    return EXIT_SUCCESS;  //  terminate successfully
+}