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C/C++ program to find the size of int, float, double and char
  • Last Updated : 05 Dec, 2019

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

C

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// C program to find the size of int, char,
// float and double data types
  
#include <stdio.h>
  
int main()
{
    int integerType;
    char charType;
    float floatType;
    double doubleType;
  
    // Calculate and Print
    // the size of integer type
    printf("Size of int is: %ld\n",
           sizeof(integerType));
  
    // Calculate and Print
    // the size of charType
    printf("Size of char is: %ld\n",
           sizeof(charType));
  
    // Calculate and Print
    // the size of floatType
    printf("Size of float is: %ld\n",
           sizeof(floatType));
  
    // Calculate and Print
    // the size of doubleType
    printf("Size of double is: %ld\n",
           sizeof(doubleType));
  
    return 0;
}

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C++

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// 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; 

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Output:

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

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