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What is the use of sizeof operator with example program in C Language

Introduction: In this article i am going to explain the use of unary operator sizeof  with example program in C Language.

The sizeof operator returns the number of bytes the operand (on which the operation is to be performed) occupies in memory i.e. the amount of space/storage, in bytes, required by the data type in memory. The Operand may be a variable, a constant or a data type qualifier.

Syntax:  sizeof (type name)
Here sizeof is unary operator and the type name is the operand.

Implementation: Let's create a program demonstrating the use of sizeof operator to check the number of bytes the various data type occupies

 #include<conio.h>
#include<stdio.h>
main()
{
   clrscr();
    printf("\nSize of character= %d byte",sizeof(char));
    printf("\nSize of short signed integer= %d bytes",sizeof(short signed int));
    printf("\nSize of short unsigned integer= %d bytes",sizeof(short unsigned int));
    printf("\nSize of long signed integer= %d bytes",sizeof(long signed int));
    printf("\nSize of long unsigned integer= %d bytes",sizeof(long unsigned int));
    printf("\nSize of float= %d bytes",sizeof(float));
    printf("\nSize of double= %d bytes",sizeof(double));
   getch();
}

Run the program by ctrl+F9

Output:

Size of character= 1 byte
Size of short signed integer= 2 bytes
Size of short unsigned integer= 2 bytes
Size of long signed integer= 4 bytes
Size of long unsigned integer= 4 bytes
Size of float= 4 bytes
Size of double= 8 bytes

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