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

Given four types of variables, namely int, char, float and double, the task is to write a program in C++ to find the size of these four types of variables. Examples:

Input: int
Output: Size of int = 4

Input: double
Output: Size of double = 8

Here is a list of all the data types with its size, range and the access specifiers:

Data Type	Memory (bytes)	Range	Format Specifier
short int	2	-32,768 to 32,767	%hd
unsigned short int	2	0 to 65,535	%hu
unsigned int	4	0 to 4,294,967,295	%u
int	4	-2,147,483,648 to 2,147,483,647	%d
long int	4	-2,147,483,648 to 2,147,483,647	%ld
unsigned long int	4	0 to 4,294,967,295	%lu
long long int	8	-(2^63) to (2^63)-1	%lld
unsigned long long int	8	0 to 18,446,744,073,709,551,615	%llu
signed char	1	-128 to 127	%c
unsigned char	1	0 to 255	%c
float	4		%f
double	8		%lf
long double	12		%Lf

To find the size of the four variables:

1. The four types of variables are defined in integerType, floatType, doubleType and charType.
2. The size of the variables is calculated using the sizeof() operator.

Below is the C++ program to find the size of int, char, float and double data types: 

C++

// C++ program to find the size of int, char,
// float and double 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;
}

Output:

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

Time complexity: O(1)

Auxiliary space: O(1)

As constant extra space is used.