Program to Calculate the Size of Each Data Type [C, C++, Python & Java]

This tutorial will help you write a program in C, C++, Python, and Java to display a program to calculate the size of each data type. It is very straightforward to write this program. You simply need to know the language syntax and data types.

What is a Data Type?

A data type refers to the type of value a variable holds and the type of mathematical, logical, or relational operations the value supports. For instance, the data type int (integer) holds the whole numbers, str (string) holds characters, and float holds decimal points.

Data types are a must in every programming language. Each data type has a specific size. This means when you declare a variable using a specific data type, it consumes the same amount of memory as the size of that data type. For example, the int data type is of size 4 bytes. Hence, when you declare a variable of the data type int , the variable consumes 4 bytes of memory.

C Program Calculate the Size of Each Data Type

#include<stdio.h>
int main()
{
    printf("The size of short integer is: %2d", sizeof(short int));
    printf("\nThe size of int is: %2d", sizeof(int));
    printf("\nThe size of int * is: %2d", sizeof(int *));
    printf("\nThe size of long int is: %2d", sizeof(long int));
    printf("\nThe size of lonf int * is: %2d", sizeof(long int *));
    printf("\nThe size of signed int is: %2d", sizeof(signed int));
    printf("\nThe size of unsigned int is: %2d", sizeof(unsigned int));
    printf("\n");
    printf("\nThe size of float is: %2d", sizeof(float));
    printf("\nThe size of float * is: %2d", sizeof(float *));
    printf("\n");
    printf("\nThe size of double is: %2d", sizeof(double));
    printf("\nThe size of double * is: %2d", sizeof(double *));
    printf("\nThe size of long double is: %2d", sizeof(long double));
    printf("\n");
    printf("\nThe size of char is: %2d", sizeof(char));
    printf("\nThe size of char * is: %2d", sizeof(char *));
    printf("\nThe size of signed char is: %2d", sizeof(signed char));
    printf("\nThe size of unsigned char is: %2d", sizeof(unsigned char));
    return 0;
}

Output:

The size of short integer is:  2
The size of int is:  4
The size of int * is:  8
The size of long int is:  8
The size of lonf int * is:  8
The size of signed int is:  4
The size of unsigned int is:  4

The size of float is:  4
The size of float * is:  8

The size of double is:  8
The size of double * is:  8
The size of long double is: 16

The size of char is:  1
The size of char * is:  8
The size of signed char is:  1
The size of unsigned char is:  1

C++ Program Calculate the Size of Each Data Type

#include<iostream>
using namespace std;
int main()
{
    cout<<"The size of short integer is: "<<sizeof(short int);
    cout<<"\nThe size of int is: "<<sizeof(int);
    cout<<"\nThe size of int * is: "<<sizeof(int *);
    cout<<"\nThe size of long int is: "<<sizeof(long int);
    cout<<"\nThe size of lonf int * is: "<<sizeof(long int *);
    cout<<"\nThe size of signed int is: "<<sizeof(signed int);
    cout<<"\nThe size of unsigned int is: "<<sizeof(unsigned int);
    cout<<"\n";
    cout<<"\nThe size of float is: "<<sizeof(float);
    cout<<"\nThe size of float * is: "<<sizeof(float *);
    cout<<"\n";
    cout<<"\nThe size of double is: "<<sizeof(double);
    cout<<"\nThe size of double * is: "<<sizeof(double *);
    cout<<"\nThe size of long double is: "<<sizeof(long double);
    cout<<"\n";
    cout<<"\nThe size of char is: "<<sizeof(char);
    cout<<"\nThe size of char * is: "<<sizeof(char *);
    cout<<"\nThe size of signed char is: "<<sizeof(signed char);
    cout<<"\nThe size of unsigned char is: "<<sizeof(unsigned char);
    return 0;
}

Output:

The size of short integer is: 2
The size of int is: 4
The size of int * is: 8
The size of long int is: 8
The size of lonf int * is: 8
The size of signed int is: 4
The size of unsigned int is: 4

The size of float is: 4
The size of float * is: 8

The size of double is: 8
The size of double * is: 8
The size of long double is: 16

The size of char is: 1
The size of char * is: 8
The size of signed char is: 1
The size of unsigned char is: 1

Python Program Calculate the Size of Each Data Type

import sys

print(f"Size of int: {sys.getsizeof(int())} bytes")
print(f"Size of float: {sys.getsizeof(float())} bytes")
print(f"Size of bool: {sys.getsizeof(bool())} bytes")
print(f"Size of str: {sys.getsizeof(str())} bytes")
print(f"Size of bytes: {sys.getsizeof(bytes())} bytes")
print(f"Size of list: {sys.getsizeof(list())} bytes")
print(f"Size of tuple: {sys.getsizeof(tuple())} bytes")
print(f"Size of set: {sys.getsizeof(set())} bytes")
print(f"Size of dict: {sys.getsizeof(dict())} bytes")

Output

Size of int: 24 bytes
Size of float: 24 bytes
Size of bool: 24 bytes
Size of str: 49 bytes
Size of bytes: 33 bytes
Size of list: 56 bytes
Size of tuple: 40 bytes
Size of set: 216 bytes
Size of dict: 64 bytes

Java Program Calculate the Size of Each Data Type

import java.util.*;
class Main {
    public static void main(String[] args) {
        System.out.println("Size of int: " + (Integer.SIZE / 8) + " bytes.");
        System.out.println("Size of short: " + (Short.SIZE / 8) + " bytes.");
        System.out.println("Size of long: " + (Long.SIZE / 8) + " bytes.");
        System.out.println("Size of char: " + (Character.SIZE / 8) + " bytes.");
        System.out.println("Size of float: " + (Float.SIZE / 8) + " bytes.");
        System.out.println("Size of double: " + (Double.SIZE / 8) + " bytes.");
    }
}

Output:

Size of int: 4 bytes.
Size of short: 2 bytes.
Size of long: 8 bytes.
Size of char: 2 bytes.
Size of float: 4 bytes.
Size of double: 8 bytes.

Conclusion

We hope you found it easy to write a program to calculate the size of different data types in C, C++, Python, and Java. If you don't know the size of any data type, you can easily find it using the above program.

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