Array Of Variables

Array of Variables Vikram Kulkarni MBA - Systems

Arrays of Variables In this chapter we will: Introduce the array as a structure for storing large amounts of data Discuss common array operations Introduce algorithms for searching and sorting arrays

Array Array is a collection of

variables of same data type and common name.

Array Types 1. One Dimensional Array 2. Two Dimensional Array

3. Multi Dimensional Arrays

3D, 4D and so on…

Example of Multi-Dimensional Array

Declaration of Array It is the same as Variable

Declaration The only difference is the number of array elements need Int count[10]; name[25];in the [ ] to beChar specified Int marks[10][5];

For two dimensional arrays

Array Initialization Arrays can be initialized by giving a list

of their elements If your list contains n elements the subscripts will range from 0 to n – 1 You do not need to allocate the array Int A[5] =after {1,2,3,4,5}; explicitly it is initialized. Float S[3] = {1.4,2.6, 8.3}; Char city[20] = “mumbai”; Int d[2][3] = {{23,30}, {14,76}, {5,21}}; Int arr[] = {5,6,7,0,10,34};

Array Subscripts Subscripts are used to access specific

array values. Subscripts starts with 0 and goes up to (n-1). Int c[7]; counts[0] counts[1] counts[6] counts[7]

// first variable in counts // second variable in counts // last variable in counts // error – trying to access // variable outside counts

c0 c1 c2 c3 c4 c5 c6

Sample Program #include Void main () { Int a[5],i; //single dimension array for (i=0;i<5;i++) { cout << “enter any number /n”; cin>>a[i]; } cout << “numbers you entered was”; for (i=0;i<5;i++) { cout << a[i]<<“/n”; } }

Sample Program #include void main() { int A[3][4]; int i; int j; for(i=0;i<3;i++) { for(j=0;j<4;j++) { cout<<“Enter a number: “; cin>>A[i][j]; }} cout<<“\n Array Contents\n”; for(i=0;i<4;i++) { for(j=0;j<4;j++) cout<
Array Operations – Copying #include Void main () { Int a[5],b[5],i; for (i=0;i<5;i++) { cout << “enter any number /n”; cin>>a[i]; } b=a; //Copying array cout << “numbers you entered was”; for (i=0;i<5;i++) { cout << b[i]<<“/n”; } }

Excersies - 1 Declare the array of 7 elements. Accept the array elements. Reverse the elements. Show the array.

Excersies – 2 Write a program to Input student name (max. 20 char) Input mark for 4 subjects. Calculate total marks. Display results as, <student name> <m1> <m2> <m3> <m4>