sizeof operator in c programming

Understanding the sizeof Operator in C Programming

sizeof Operator: sizeof is a unary operator. This operator gives the size of its operand in terms of bytes. The operand can be a variable, constant or any datatype(int, float, char, etc.

Notes

• sizeof operator symbol: sizeof(  )
• it is a unary the operator
• sizeof operator will give us the size of constant, variable, or datatype
• sizeof operator will give us the result in the form of a byte
• in sizeof operator, we should not write any expression
• if suppose expressions are present in sizeof operator those expressions are not going to solve

Program 01

#include
void main()
{
char ch='a';
printf("%d %d %d\n",sizeof(char),sizeof(ch),sizeof('a'));
}

 output: 1 1 1

 

Program to understand the sizeof operator 

#include
main()
{
int var;
printf("size of int= %d\n",sizeof(int));
printf("size of float=%d\n",sizeof(float));
printf("size of integer constant =%d\n",sizeof(45));
printf("size of var = %d\n",sizeof(var));
}

Output:

size of int=4
size of float = 4
Size of var =4
Size of integer constant=4

 

Function Data Passing or function data printing

Function Data passing is done from right to left but printing is done from left to right 

Program: Prove the data is passed to right to left

#include
int main()
{
int k=35;
printf("%d %d %d\n",k==35,k=50,k>40);
}

Attention: whenever data pass to the compiler first data pass to the compiler from the right side . first pass k>40  after data k=50 after that k==35 at last " %d %d %d" all %d treated as one sting but printing is reversed manner means first string print then rest