C++ Program to Find the Size of int, float, double and char

In this article, we will learn how to find the size of int, float, double, and char data types in C++. The sizeof() operator helps determine the memory occupied by a data type or variable.

• The size of a data type is measured in bytes.
• The actual size can vary depending on the compiler and system architecture.

Finding the Size of Data Types Using sizeof()

The sizeof() operator returns the size of a data type or variable in bytes.

Syntax

sizeof(dataType);

To find the size of the four datatypes:

• Declare variables of type int, float, double, and char.
• Use the sizeof() operator to determine the size of each variable.
• Print the results.

C++ Program to Find the Size of a Data Types

#include <iostream>
using namespace std;

int main()
{
    int integerType;
    char charType;
    float floatType;
    double doubleType;

    // Calculate and Print
    // the size of integer type
    cout << "Size of int is: " << sizeof(integerType)
         << "\n";

    // Calculate and Print
    // the size of doubleType
    cout << "Size of char is: " << sizeof(charType) << "\n";

    // Calculate and Print
    // the size of charType
    cout << "Size of float is: " << sizeof(floatType)
         << "\n";

    // Calculate and Print
    // the size of floatType
    cout << "Size of double is: " << sizeof(doubleType)
         << "\n";

    return 0;
}

Size of int is: 4
Size of char is: 1
Size of float is: 4
Size of double is: 8

Note: The size of a data type is implementation-defined and may vary across systems. For example, int is commonly 4 bytes, but the C++ standard does not require it to be exactly 4 bytes.