Very beginning of C++

Author: priteshgohil

.gitignore

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+# ignore executable files
+*.out 

001_Helow-World.cpp

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+#include<iostream>
+
+int main() {
+  std::cout << "First Example Program" << std::endl;
+  //return 0; //Success status, saying programm worked fine.
+  return EXIT_SUCCESS; //Optional to return, compiler includes it automatically.
+}

002_IO_and_Variables.cpp

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+#include<iostream>
+#include<string>
+#include <math.h>
+
+int main () {
+  // Integer
+  int nSum (1);  //Initialize
+  short int snVar1 = 14;
+  long int lnVar2 = 553;
+  long long int llnVar3 = -4454;
+  unsigned int unCount = 56;
+  unsigned short int usnVar4 = 6435;
+  unsigned long int ulnVar5 = 73;
+  unsigned long long int ullnVar6 = 821;
+
+  std::cout << "int is: " << nSum << " and size is: " << sizeof(nSum) << \
+  " Byte" << '\n';
+  std::cout << "short int is: " << snVar1 << " and size is: " << sizeof(snVar1)\
+  << " Byte" << '\n';
+  std::cout << "long int is: " << lnVar2 << " and size is: " << sizeof(lnVar2)\
+  << " Byte" << '\n';
+  std::cout << "long long int is: " << llnVar3 << " and size is: " \
+  << sizeof(llnVar3) << " Byte" << '\n';
+  std::cout << "unsigned int: " << unCount << " and size is: " << sizeof(unCount)\
+  << " Byte" << '\n';
+  std::cout << "unsigned short int: " << usnVar4 << " and size is: " \
+  << sizeof(usnVar4) << " Byte" << '\n';
+  std::cout << "unsigned long int: " << ulnVar5 << " and size is: " \
+  << sizeof(ulnVar5) << " Byte" << '\n';
+  std::cout << "unsigned long long int: " << ullnVar6 << " and size is: " \
+  << sizeof(ullnVar6) << " Byte" << "\n \n";
+
+  float fPercentage = 50.66;
+  double dPrice = 1e-3;
+  long double ldPI = M_PI;
+  std::cout << "float is: " << fPercentage << " and size is: " << \
+  sizeof(fPercentage) << " Byte" << '\n';
+  std::cout << "double is: " << dPrice << " and size is: " << \
+  sizeof(dPrice) << " Byte" << '\n';
+  std::cout << "long double is: " << ldPI << " and size is: " << \
+  sizeof(ldPI) << " Byte" << "\n \n";
+
+  bool bStatus = true;
+  std::cout << "bool is: " << bStatus << " and size is: " << sizeof(bStatus) <<\
+  " Byte" << "\n \n";
+
+  char cByte = 'P'; // or =u8'a'
+  char16_t cByte2 = u'R';
+  char32_t cByte4 = U'I';
+  std::cout << "char is: " << cByte << " and size is: " << sizeof(cByte) << \
+  " Byte" << "\n";
+  std::cout << "char16_t is: " << cByte2 << " and size is: " << sizeof(cByte2) \
+  << " Byte" << "\n";
+  std::cout << "char32_t is: " << cByte4 << " and size is: " << sizeof(cByte4) \
+  << " Byte" << "\n";
+
+
+  std::string sLine ;
+  sLine = "This is a String variable";
+
+  std::cout << "Enter Input integer: "  << '\n';
+  std::cin >>unCount;
+  if(!std::cin.good()){
+			std::cerr << "Invalid input." << "\n";
+	}
+  else {
+    nSum += unCount; //https://stackoverflow.com/a/30036580/10451749
+    std::cout << "Sum is: " << nSum << '\n';
+  }
+
+  std::cout << "Enter String Message: " << '\n';
+  // std::cin >> sLine;
+  std::cin.ignore(); //ignore '\n' character in the stream left by previous read
+  getline (std::cin, sLine);
+  std::cout << sLine << '\n';
+  return EXIT_SUCCESS;
+
+}