The C Sizeof operator is one of the C Programming Operators. SizeOf operator is mostly used to find the array size, structure size, and do some calculations as per the results.
The C sizeof operator returns the size (number of bytes) of a declared variable or data type. Let us see one C programming example for better understanding
C Sizeof Operator Example
In this sizeof Operator example program, We are going to check the size of an integer, float, character, double and character array using sizeof operator.
/* C Sizeof Operator Example */
#include <stdio.h>
int main()
{
int a;
int b[20];
printf(" Size of int data type:%d \n ", sizeof (int) );
printf(" Size of char data type:%d \n ", sizeof (char) );
printf(" Size of float data type:%d \n ", sizeof (float) );
printf(" Size of double data type:%d \n ", sizeof (double) );
printf(" Size of int data type:%d \n ", sizeof (a) );
printf(" Size of an int array:%d \n ", sizeof (b) );
return 0;
}
The result of sizeof (b): Although we declared the size of the b as 20, it displays output as 80. Because b array will store 20 integer members, and every integer member needs 4 bytes of space ( means 20 * 4 Bytes for every integer member.)
