Framework (A-Z)

Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Name

sizeof()
Examples 
char arr[10]; // Array of 10 characters
int val = 1000;

void setup() 
{
  Serial.begin(9600);  
  Serial.print("Array size in bytes is: ");
  Serial.println(sizeof(arr));
  Serial.print("val size in bytes is: ");
  Serial.println(sizeof(val));
  Serial.print("double datatype size in bytes is: ");
  Serial.println(sizeof(double));
}

void loop() 
{
  
}
Description The sizeof operator is used to determine the amount of space in bytes any data-element/datatype occupies in memory. To use sizeof, the keyword "sizeof" is followed by a type name, variable, or expression. If a type name is used, it always needs to be enclosed in parentheses, whereas variable names and expressions can be specified with or without parentheses.
Syntax 
sizeof var
sizeof(var)
sizeof(datatype)
Parameters
var variable name
datatype any valid datatype: int, double, float, char, double
Returns int: the size in bytes
Usage Application
Updated on July 07, 2011 11:09:00pm PDT

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