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C Array length example

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An array is a contiguous group of data items with the same name and data type. In order to get the length of an array, we have used the sizeof operator.

C Array length example

     

In this section you will learn how to determine the length of an array in C.

An array is a contiguous group of data items with the same name and data type. In order to get the length of an array, we have used the sizeof operator. The sizeof operator gives the amount of storage, in bytes, required to store an object. This operator avoids machine-dependent data sizes in the programs.

#include
-
Coded statements that contain (#)sharp sign are are the directives of the preprocessor. In our example #include<stdio.h> is an indication for preprocessor of the compiler and it means to include the stdio.h header file. 

<stdio.h>- This is the header file due to which standard input/output functions are included to be performed into the program. It is necessary to include this header file as it is having some inbuilt functions like printf(), scanf() etc. The angle brackets are used to indicate system include files.

<conio.h>
- Its a non standard header file that contains clrscr(), getch() functions.

void main() - main is the function, inside which the compiler looks for the data to compile first. Though this method has default return int but the return type can be set to void that means now method return type is void and it will return no value.

clrscr()- It is used to clear the console  screen.

sizeof(array)/sizeof(int)
- These are the operators that determines the length of the array passed inside the operator parentheses..

getch()- This function reads each character. It holds the console screen and program output on it. Without this output on the screen will generate in flash and vanishes.

Here is the code:

ARRAYLEN.C

#include <stdio.h>
#include <conio.h>
int array[6]12345};
void main() {
  clrscr();
  int len=sizeof(array)/sizeof(int);
  printf("Length Of Array=%d", len);
  getch();
}

Output will be displayed as:

ARRAYLEN.EXE

Download Source Code:

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Posted on: February 5, 2009

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Comments:8
joon
June 25, 2011
more precisely

int len=sizeof(array)/sizeof(array[0]);
bollinger
October 7, 2011
array programs in asp.net

simple programs in asp.net
khushi
December 14, 2011
assending desending in array

please learn more about array & this subject.
kushi
December 14, 2011
assending desending in array.

please give me a ans for this subject.
shahgeb
December 23, 2011
wrong calculation in size of array

Hi, hope you never mind. you are passing length of array like this. int array[6]= { 1, 2, 3, 4, 5, 6 }; change above line of initlization of array into int array[]= { 1, 2, 3, 4, 5, 6 }; now find size of array. dude you are passing hardcode length 6 that's why you are able to calculate.what I would do when I dont know how many length in array, a user passing thanks
Rashida Bohri
January 28, 2012
Array in c

why the index position of array starts from 0?
Tanvir
March 24, 2012
about size of array

great, thank you for your code.
ace
September 26, 2012
ace

it's so difficult for me in using array in program
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