sizeof operator

The sizeof operator is used to calculate the size of data type or variables. This operator returns the size of its variable in bytes.

For example: sizeof(a), where a is interger, will return 4.

Syntax

sizeof(variable)

Example

#include<stdio.h>
#include<conio.h>

void main()
{
int a;
float b;
double c;
char d;
printf("Size of Integer: %d bytes\n",sizeof(a));
printf("Size of float: %d bytes\n",sizeof(b));
printf("Size of double: %d bytes\n",sizeof(c));
printf("Size of character: %d byte\n",sizeof(d));
getch();
}

Output

Size of Integer: 2
Size of float: 4
Size of double: 8
Size of character: 1