Computer Programming Code: CS1112

1. Computer ProgrammingCode: CS1112 Lecture No. 8 Bilal Ashfaq Ahmed

2. ARRAYS

3. Arrays • Definition: “A collection of variables which are all of the same type “. • They are special kind of data type(composite). • They are data structures in which identical data types are stored(homogeneous in nature). • In C each array has • Name • Data type • Size • Corresponding Index or Subscript • They occupy contiguous /continuous area of memory.

4. Declaration of Arrays arrayType arrayName[Size]; For example , int age [ 10 ] ;

5. Name memory Age[0] 24 Age [1] 59 Age [2] 35 Age [3] ... Age [4] ... Age [5] ... Age [6] ... Age [7] ... Age [8] ... Age [9] ... Storage of an array in memory Value Index

6. Declaration of Arrays arrayType arrayName [numberOfElements ]; For example , int age [ 10 ] ; • More than one array can be declared on a line int age [10] , height [10] , names [20] ; • Mix declaration of variables with declaration of arrays int i , j , age [10] ;

7. Referring to Array Elements Array name[array element]; e.g. age index number age [ 4 ];

8. Example1: Using Arrays for ( i = 0 ; i < 10 ; i ++ ) { cin >> age [ i ] ; }

9. Example 2 totalAge = 0 ; for ( i = 0 ; i < 10 ; i ++ ) { totalAge + = age [ i ] ; }

10. Initializing an Array int age [ 10 ] ; for ( i = 0 ; i < 10 ; i ++ ) { age [ i ] = 0 ; }

11. Initializing an Array int age [ 10 ] = { 0,0,0,0,0,0,0,0,0,0 } ; int age[ 10 ] = { 0 } ;

12. Initializing an Array int age [ ] = { 1,2,3,4,5,6,7,8,9,10 } ; for ( i = 0 ; i < 10 ; i ++ ) ‘ i ‘ will have value from 0 to 9

13. Displaying Results