Array in C program

Array

Array is a collection of similar data type items. Arrays are used to store group of data of same datatype. Arrays can of any datatype. Arrays must have constant size. Continuous memory locations are used to store array. Array index always starts with 0.

Example for Arrays:

int a[5]; // integer array

char a[5]; // character(string) array

Types of Arrays:

# One Dimensional Array

# Two Dimensional Array

# Multi Dimensional Array

8.1.1 One Dimensional Array

Array declaration

int age [5];

Array initialization

int age[5]={0, 1, 2, 3, 4, 5};

Accessing array

age[0]; /*0_is_accessed*/

age[1]; /*1_is_accessed*/

age[2]; /*2_is_accessed*/

8.1.2 Two Dimensional Array

Two dimensional array is combination of rows n columns.

Array declaration

int arr[2][2];

Array initialization

int arr[2][2] = {{1,2}, {3,4}};

Accessing array

arr [0][0] = 1;

arr [0][1] = 2;

arr [1][0] = 3;

arr [1][1] = 4;

8.1.3 Multi Dimensional Array

C programming language allows programmer to create arrays of arrays known as multidimensional arrays.

For example:

float a[2][4][3];

8.1.4 Passing Array To Function

In C we can pass entire Arrays to functions as an argument.

For eg.

#include <stdio.h>

void display(int a)

{

  int i;

  for(i=0;i < 4;i++){

    printf("%d",a[i]);

  }

}

int main(){

  int c[]={1,2,3,4};

  display(c);

  //Passing array to display.

  return 0;

}

See Programs section of this app for example of Arrays