problem14

//Solved by Sagar M, Dept of CSE


C Array

An array is a collection of same type of elements which are sheltered under a common name.

<type-of-array> <name-of-array> [<number of elements in array>];

  arr[i] = i; // Initializing each element seperately 

Accessing Values in an Array:

  arr[i] = i; // Initializing each element separately 

int j = arr[5]; // Accessing the 6th element of integer array arr and assigning 

    struct st st_arr[3]; // Declare an array of 3 structure objects 

    struct st st_obj0; // first structure object

    struct st st_obj1; //Second structure object

    struct st st_obj2; // Third structure object

    st_arr[0] = st_obj0; // Initializing first element of array with first 

    st_arr[1] = st_obj1; // Initializing second element of array with second 

    st_arr[2] = st_obj2; // Initializing third element of array with third 

    printf("\n First Element of array has values of a = [%d] and c = [%c]\n", 

    printf("\n Second Element of array has values of a = [%d] and c = [%c]\n", 

    printf("\n Third Element of array has values of a = [%d] and c = [%c]\n", 

Pointers in C Programming language is very powerful. Combining pointers with arrays can be very 

A Simple C Program using Arrays

Consider this simple program that copies a string into an array and then changes one of its 

    char arr[4];// for accommodating 3 characters and one null '\0' byte.

    char *ptr = "abc"; //a string containing 'a', 'b', 'c', '\0' 

    memset(arr, '\0', sizeof(arr)); //reset all the bytes so that none of the 

    strncpy(arr,ptr,sizeof("abc")); // Copy the string "abc" into the array arr 

    printf("\n %s \n",arr); //print the array as string 

    arr[0] = 'p'; // change the first character in the array 

    printf("\n %s \n",arr);//again print the array as string

I think the program is self explanatory as I have added plenty of comments. The output of the above 

In C, an array is a fixed-size region of contiguous storage containing multiple 

objects, one after the other. This array is an "object" in the meaning which C gives to the 

word - basically just some memory that represents something. An object could just be 

You can distinguish slightly between array objects, and array types. Often people 

use array objectswhich are allocated with malloc, and used via a pointer to the first element. 

But C does also have specific types for arrays of different sizes, and also for variable-

length-arrays, whose size is set when they are created. VLAs have a slightly misleading 

name: the size is only "variable" in the sense that it isn't fixed at compile time. It can't 

change during the lifetime of the object.

So, when I say an array is fixed-size I mean that the size cannot change once the 

array is created, and this includes VLAs. There is realloc, which logically returns a pointer 

to a new array that replaces the old one, but can sometimes return the same address 

passed in, having changed the size of the array in place. realloc operates on memory 

allocations, not on arrays in general.

That's what an array is. The C programming language doesn't define anything called 

a list. Can't really compare something which is well defined, with something that isn't 

defined ;-) Usually "list" would mean a linked list, but in some contexts or in other languages 

For that matter, in other languages "array" could mean other things, although I can't 

immediately think of a language where it means anything very different from a C array