One Dimensional Array
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This document discusses one-dimensional arrays. It defines a one-dimensional array as a list of values with the same data type stored under a single name. Elements are stored in consecutive memory locations and can be accessed using the array name and index. Individual elements are referenced as array_name[index]. The size of an array is the number of elements, and the type refers to the data type of the values. Memory addresses for elements are calculated from the base address using the index and size. Examples are provided to demonstrate accessing elements and calculating memory addresses.
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One Dimensional Array
- 1. Arrays Dincy R Arikkat Christ College(Autonomous),Irinjalakuda
- 3. One-Dimensional Arrays • A list of values with the same data type that are stored using a single group name (array name). • Elements of the array are stored in consecutive memory location. • Only One dimension • General array declaration statement: data-type array-name[number-of-items]; • Example float arr[SIZE];
- 4. One-Dimensional Arrays (cont.) • Individual elements of the array can be accessed by specifying the name of the array and the element's index: arr[3] • Warning: indices assume values from 0 to number-of- items -1 !!
- 5. One-Dimensional Arrays (cont.) arr[0] arr[1] arr[2] arr[3] arr[4] Skip over 3 elements to get the starting location of element 4 The array name arr identifies the starting location of the array Start here element 4
- 6. Some array terminology • Size-No.of elements in an array is called the size of the array. • Type-The kind of values it can store. • Array name-name of array • Base or index address-memory location where the first element of the array is located.
- 7. Some Array Terminology mark[50] mark[5] mark[2] mark[2] = 32; Array name Index - also called a subscript - must be an int, - or an expression that evaluates to an int Indexed variable - also called an element or subscripted variable Note that "element" may refer to either a single indexed variable in the array or the value of a single indexed variable. Value of the indexed variable - also called an element of the array size
- 8. Memory representation 1st eleme nt 2nd eleme nt 3rd eleme nt …… Nth eleme nt Array[1]Array[0] Array[2] Array[n-1]
- 9. Example
- 10. Memory address calculation • Address of A[I]= Base Address + size * (I - Lower Bound) • Normally Lower Bound is 0,In some programming language it will differ.
- 12. Question • Given an array int marks[]={99,67,85,32,48,55,52}; Calculate the address of marks[4],if the base address is 1000.
- 13. Solution • Address of A[I]= Base Address + size * (I - Lower Bound) Here, Base address=1000, I=4, Lower Bound=0 Size of Int=2 Marks[4]=1000+ 2*(4-0) = 1008
- 14. Question • Suppose an array A[10 … 20] is stored in a memory whose starting address is 4000.Find the address of A[15]?
- 15. Solution • Base address=4000 • I=15,Lower Bound=10 • Size-2 • Address of A[I]=B.A + size*(I-Lower bound) • Address of A[15]=4000+2*(15-10) =4010
- 16. Thank You