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sizeof() Operator in C Programming Language
sizeof() Operator in C
The sizeof() operator is commonly used in C. It determines the size of the expression or the data type specified in the number of char-sized storage units. The sizeof() operator contains a single operand which can be either an expression or a data typecast where the cast is data type enclosed within parenthesis. The data type cannot only be primitive data types such as integer or floating data types, but it can also be pointer data types and compound data types such as unions and structs.
Syntax for sizeof() Operator in C
#include <stdio.h>
sizeof (data type)
data type
Where data type is the desired data type including classes, structures, unions and any other user defined data type.
Mainly, programs know the storage size of the primitive data types. Though the storage size of the data type is constant, it varies when implemented in different platforms. For example, we dynamically allocate the array space by using sizeof() operator:
/* return the size of a variable by sizeof() operator example */
int main( int argc, char* argv[] )
{
printf("sizeof(char) = %d\n", sizeof(char) );
printf("sizeof(short) = %d\n", sizeof(short) );
printf("sizeof(int) = %d\n", sizeof(int) );
printf("sizeof(long) = %d\n", sizeof(long) );
printf("sizeof(long long) = %d\n", sizeof(long long) );
printf("\n");
printf("sizeof(unsigned char) = %d\n", sizeof(unsigned char) );
printf("sizeof(unsigned short) = %d\n", sizeof(unsigned short) );
printf("sizeof(unsigned int) = %d\n", sizeof(unsigned int) );
printf("sizeof(unsigned long) = %d\n", sizeof(unsigned long) );
printf("\n");
printf("sizeof(float) = %d\n", sizeof(float) );
printf("sizeof(double) = %d\n", sizeof(double) );
printf("sizeof(long double) = %d\n", sizeof(long double) );
printf("\n");
int x;
printf("sizeof(x) = %d\n", sizeof(x) );
}
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