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.

Description: In previous articles i explained the programs How to check for vowel or consonant using switch case and Calculate sum,average and division of marks using else-if ladder and Get number of days in month and year using else if ladder and Find greatest of two numbers using conditional operator and Find greatest of three numbers using multiple if statement.

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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