by Dinesh Thakur Category: Array

When a program containing an array of size n is compiled, the compiler allocates n blocks of memory for the array for storing the values of its elements. The size of each block depends on the data type of the array. For example, for the array AR [ ] defined below, five blocks of memory are allocated and each block is of the size of the memory block for an integer (i.e., 4 bytes on a 32-bit system).



 
by Dinesh Thakur Category: Array

The maximum or minimum value may be determined by comparing the values of array elements. Let us assume that the maximum value is represented by 'max'. The value of the first element of the array is assigned to max.

 
by Dinesh Thakur Category: Array

In case of large arrays, the method of comparing every array element with key as described above is rather inefficient. However, if an array is a sorted one, the search process can be considerably shortened by using binary search method. For the application of binary search the array should be first sorted.

 
by Dinesh Thakur Category: Array

Searching an array for a value is the most common occurrence in programming as well as in real life. Often it is required to search a name in a list of names or search a roll number in a list of roll numbers.

 
by Dinesh Thakur Category: Array

Any operation on an array has to be carried out element by element. It cannot be performed on the array as a whole. Therefore, in swapping also, an element of one array is swapped with an element of another array. The two may not have the same index value if you are not dealing with vectors and matrices.

 
by Dinesh Thakur Category: Array

An array is similar to a list in which the objects are of the same type and stored in sequential memory blocks; this is the only relationship between the elements of an array. The input/output of values of elements of an array cannot be done as whole of array, but is carried out element by element. This may be done by accessing each element by its index value. Therefore, for large arrays, either a for loop or a while loop may be used for accessing each element for its input/output. For example, if elements of an array Array [4] having 4 elements are to be processed for input /output by user of a program, the program code may be written as follows:

 
by Dinesh Thakur Category: Array

As we know, a pointer to type T is analogous to an array of type T.A pointer can be used to represent a vector, as illustrated in Fig. When a pointer is declared, the memory is allocated only for the pointer variable. The memory for the array elements is usually allocated separately using dynamic memory allocation functions, namely, malloc or calloc.

 
by Dinesh Thakur Category: Array

An array is a powerful and easy-to-use data structure provided in the C language. We know that arrays provide easy access to their elements and entire arrays can be manipulated easily using loops. However, there are some drawbacks/limitations of arrays:

 
by Dinesh Thakur Category: Array

When we declare a pointer, it does not point to any specific variable. We must initialize it to point to the desired variable. This is achieved by assigning the address of that variable to the pointer variable, as shown below.

 
by Dinesh Thakur Category: Array

C language permits the use of multidimensional arrays. It is easy to visualize arrays up to three dimensions. However, we may have difficulty in visualizing a four, five or in general, an n-dimensional array.

 
by Dinesh Thakur Category: Array

A two-dimensional array (commonly called a matrix) consists of elements of the same type arranged in rows and columns. The rows and columns of a matrix are numbered starting from 0. Thus, for an array of size rows x cols, the row subscripts are in the range 0 to rows - 1 and the column subscripts are in the range 0 to cols - 1.

 
by Dinesh Thakur Category: Array

As in case of scalar variables, we can also use external or global arrays in a program, i. e., the arrays which are defined outside any function. These arrays have global scope.

 
by Dinesh Thakur Category: Array

In the HSC examination, there are six subjects each having a maximum of 100 marks. To pass the examination, a student has to score at least 35 marks in each subject. If a student passes, total marks and percentage marks are calculated and a class is awarded based on the percentage marks (perce)as follows:

 
by Dinesh Thakur Category: Array

For a list of numbers x whose elements are referred to as x0, x1,…..., xn-1, the mean bar x and the standard deviation a are defined as

 
by Dinesh Thakur Category: Array

For two vectors a and b having n elements each, the addition operation yields a vector (say c) of size n. The ith element of the result vector is obtained by adding the corresponding vector elements, i.e., ci =ai+ bi. The algorithm to perform the desired addition is given below.

 
by Dinesh Thakur Category: Array

In this program, an array num of type int is used to store the given integer numbers and variable nelem to store their count. First, the value of nelem is read. Then a for loop is used to read the given numbers and store them in array num. Finally, another for loop is used to print the given numbers in reverse order.

 
by Dinesh Thakur Category: Array

This feature can be used with arrays as well. A static array has the following characteristics:

 
by Dinesh Thakur Category: Array

If we desire that the elements of a vector should not be modified, we can declare that vector as a const vector. However, we must initialize this vector when it is declared, as it is not possible to modify it subsequently. Thus, a const vector can be declared and initialized as shown below.

 
by Dinesh Thakur Category: Array

We can pass an array (one-, two- or multidimensional) as an argument to a function. The C language allows us to define functions that have one or more arrays as parameters. These parameters can be of different types and sizes. Moreover, we can mix scalar and array parameters. A function that uses a single one-dimensional array as a parameter can be defined as shown below.

 
by Dinesh Thakur Category: Array

Array Declaration

Every array is given a name. The rules for naming arrays are the same as those used for variable names. As with scalar variables, an array must be declared before it is used. The declaration of a one-dimensional array takes the following form:

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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