C++ Variables and Types

Common types: int, double, char, bool, string. auto lets the compiler work out the type. const makes a constant.

ExampleC++

#include <iostream>
#include <string>
using namespace std;

int main() {
  string name = "Ada";
  int age = 36;
  double height = 1.68;
  bool student = false;
  char grade = 'A';
  const int YEAR = 2026;
  auto count = 10;   // int

  cout << name << " is " << age << endl;
  cout << height << " " << student << " " << grade << endl;
  cout << YEAR << " " << count << endl;
  cout << boolalpha << student << endl;
  return 0;
}

Output

Ada is 36
1.68 0 A
2026 10
false

Quick check

What does auto do?

Makes a variable automatic memoryLets the compiler deduce the typeMakes a constant

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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