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.

C

// 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", sizeof(integerType));

    // Calculate and Print
    // the size of charType
    printf("\nSize of char is: %ld", sizeof(charType));

    // Calculate and Print
    // the size of floatType
    printf("\nSize of float is: %ld", sizeof(floatType));

    // Calculate and Print
    // the size of doubleType
    printf("\nSize of double is: %ld", sizeof(doubleType));

    return 0;
}

Output

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

The time complexity and auxiliary space are both constant time, O(1).