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

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  • Difficulty Level : Basic
  • Last Updated : 26 Feb, 2023
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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. sizeof 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 TypeMemory (bytes)RangeFormat Specifier
short int2-32,768 to 32,767%hd
unsigned short int20 to 65,535%hu
unsigned int40 to 4,294,967,295%u
int4-2,147,483,648 to 2,147,483,647%d
long int4-2,147,483,648 to 2,147,483,647%ld
unsigned long int40 to 4,294,967,295%lu
long long int8-(2^63) to (2^63)-1%lld
unsigned long long int80 to 18,446,744,073,709,551,615%llu
signed char1-128 to 127%c
unsigned char10 to 255%c
float4 %f
double8 %lf
long double12 %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++ 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;


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.

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