C++ Developer -

In C++, every piece of data has a type that tells the compiler what kind of value it holds. The most common basic types are int for whole numbers, double for decimal numbers, char for a single character, bool for true or false, and string for text. Choosing the right type is important because it determines what you can do with the data and how much memory it uses. This lesson will introduce each basic data type and show how to use them in your programs.

#include <iostream>
using namespace std;

int main() {
    int age = 10;
    string name = "Bob";
    cout << name << " is " << age;
    return 0;
}

• int stores whole numbers like 10 without any decimal part.
• string stores text like "Bob" and must be in double quotes.
• The program prints the string value followed by the int value.
• The output is Bob is 10.

#include <iostream>
using namespace std;

int main() {
    double price = 4.99;
    cout << "Price: " << price;
    return 0;
}

• double stores decimal numbers like 4.99.
• Use double when you need to represent fractional values like prices or measurements.
• The program prints Price: 4.99.

#include <iostream>
using namespace std;

int main() {
    char grade = 'A';
    cout << "Grade: " << grade;
    return 0;
}

• char stores a single character like 'A'.
• Character values must be enclosed in single quotes, not double quotes.
• The program prints Grade: A.

#include <iostream>
using namespace std;

int main() {
    string city = "London";
    cout << "City: " << city;
    return 0;
}

• string stores a sequence of characters like "London".
• Strings must be surrounded by double quotes.
• The program prints City: London.

#include <iostream>
using namespace std;

int main() {
    bool isReady = true;
    cout << isReady;
    return 0;
}

• bool stores a truth value: either true or false.
• When printed, true shows as 1 and false shows as 0.
• Booleans are useful for conditions and flags in your programs.

#include <iostream>
using namespace std;

int main() {
    int count = 7;
    double cost = 2.5;
    cout << count * cost;
    return 0;
}

• You can use different data types together in expressions.
• int count = 7; stores a whole number and double cost = 2.5; stores a decimal.
• Multiplying an int and a double produces a double result.
• The program prints 17.5.