Introducing the sizeof Operator - C Data Type

Introduction

You can find out how many bytes are occupied for a given type by using the sizeof operator.

Here's how you could store a value that results from applying the sizeof operator:

size_t size = sizeof(long long);

This program will output the number of bytes occupied by each numeric type:

Demo Code

#include <stdio.h>

int main(void)
{
  printf("Variables of type char occupy %u bytes\n", sizeof(char));
  printf("Variables of type short occupy %u bytes\n", sizeof(short));
  printf("Variables of type int occupy %u bytes\n", sizeof(int));
  printf("Variables of type long occupy %u bytes\n", sizeof(long));
  printf("Variables of type long long occupy %u bytes\n", sizeof(long long));
  printf("Variables of type float occupy %u bytes\n", sizeof(float));
  printf("Variables of type double occupy %u bytes\n", sizeof(double));
  printf("Variables of type long double occupy %u bytes\n", sizeof(long double));
  return 0;/*  ww  w .jav  a 2s .  c  om*/
}

Result

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